Dmitry Vysotsky | Moscow Institute of Physics and Technology (original) (raw)
Papers by Dmitry Vysotsky
Conference on Lasers and Electro-Optics, May 16, 2004
2D antiguided vertical cavity surface emitting laser array above threshold operation was studied ... more 2D antiguided vertical cavity surface emitting laser array above threshold operation was studied by 3D bi-directional beam propagation method and experimentally. 5/spl times/5 rectangular array emit in-phase mode up to >10 threshold in agreement with theory.
2019 IEEE 8th International Conference on Advanced Optoelectronics and Lasers (CAOL), 2019
Above threshold modelling of quantum cascade lasers is a complicated numerical problem due to gai... more Above threshold modelling of quantum cascade lasers is a complicated numerical problem due to gain spatial anisotropy and very strong thermal effects. We suggest semi-vectorial approach for 3D modelling of the quantum cascade laser, in which the wave field is considered as TM-like mode. Resonant antiguide array of lasers is modelled as an example. The heating is due to ohmic losses in the active regions. The single mode operation stability is studied by calculating the higher order modes when the gain and refractive index distribution are produced by the lasing mode.
2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC), 2019
Phase-locked array of diode lasers is an attractive way to achieve multi-Watt power single-mode o... more Phase-locked array of diode lasers is an attractive way to achieve multi-Watt power single-mode operation. Theoretical analysis of the optical modes of planarized phase-locked quantum cascade laser arrays (QCLA) emitting at 4.8 pm was performed in [1], [2]. These high-index-contract photonic crystal (HC-PC) structures allow global coupling between all array elements. Our numerical modelling predicts that even in the presence of strong thermal lensing under CW operation, 3-element QCLA can achieve more than 1W power.
6th International Conference on Laser and Fiber-Optical Networks Modeling, 2004. Proceedings of LFNM 2004.
ABSTRACT
Numerical modelling of quantum cascade laser (QCL) is a very complicated problem since the gain i... more Numerical modelling of quantum cascade laser (QCL) is a very complicated problem since the gain is spatially anisotropical in this type of laser. Besides, low efficiency results in very strong thermal effects in CW operation regime. QCL with embedded high index contrast structrures, such as resonant antiguided arrays, can achieve the output power level more than 1W in single spatial mode lasing. We present 3D model of such QCL, which is based on the semivectorial beam propagation method. The single mode operation stability is studied for pulse and CW operation regimes.
Theround-trip operator techniquie iswidely usedfordispersionless optical resonators beginning fro... more Theround-trip operator techniquie iswidely usedfordispersionless optical resonators beginning from pioneering studies ofFoxandLi.Resonator modesaredetermined astheeigen-functions oftherouind-trip operator andmaybecalculated bymeansofnumerical linear algebra. Corresponding complex eigen-valucs detcrmine the wavelength shifts relative toreference value anddamping factors. Dispersion elements, forexample, Bragg mirrors inVCSELresult independence ofpropagation operator onthewavelength anddamping factor. Wecandetermine theround-trip operator inthis casealso, butunknown values ofthewavelength anddamping factor enter into the operator byacomplicated manner. Trial-and-error method fordetermination ofwavelength shifts anddamping factors ispossible butitisverylaborious method, Theproposed proximate numerical method forcalculation of resonator modesisbased onsolution oflinear cigen-problem fortheround-trip operator withreference wavelength andzerodamping. Thewavelength shifts anddamping factor...
IEEE Journal of Quantum Electronics, 2019
A numerical model is developed for a phase-locked array of quantum cascade lasers. The population... more A numerical model is developed for a phase-locked array of quantum cascade lasers. The population density is derived from rate equations. The temperature distribution for stationary generation is produced by ohmic heating. It is shown that the results of above-threshold operation modeling by the semi-vectorial beam propagation method are in good agreement with the modal analysis provided by the vectorial-COMSOL solver supplemented with the Rigrod's model estimations. The wall-plug efficiency and the limits of the single-mode lasing are found. Thermal lensing is shown to be the main reason limiting the single-spatial-mode power under CW-operating conditions.
Problems of Atomic Science and Technology, Ser. Thermonuclear Fusion, 2018
Монитор эрозии предназначен для контроля процессов эрозии и напыления материалов на стенках вакуу... more Монитор эрозии предназначен для контроля процессов эрозии и напыления материалов на стенках вакуумной камеры токамака ИТЭР, проходящих под воздействием потоков излучения и частиц со стороны плазмы. Требуемые точность и диапазон измерений могут быть достигнуты с использованием метода двухволновой интерферометрии. Однако из-за вибрации конструкции установки снимки надо сделать за такой короткий промежуток времени, который не обеспечивают существующие фотокамеры. В данной работе предлагается использовать в интерферометре импульсный лазер с перестраиваемой длиной волны и рассматриваются способы регистрации интерферограмм в условиях вибраций. Проводятся оценки требуемых параметров лазера и анализ ожидаемых результатов. Ключевые слова: эрозия и напыление, первая стенка, интерферометрия, токамак ИТЭР, лазер.
The 16th Annual Meeting of the IEEE Lasers and Electro-Optics Society, 2003. LEOS 2003.
The in-phase mode emission in coupled VCSELs and 2D 4×4 VCSEL arrays has been reported using anti... more The in-phase mode emission in coupled VCSELs and 2D 4×4 VCSEL arrays has been reported using antiguided VCSEL elements. Two-step metalorganic chemical vapor deposition (MOCVD) is used for the growth of the antiguided VCSEL array structure. Here we demonstrate that in-phase mode operation can be achieved from very large aperture (up to 20×20) rectangular and triangular antiguided VCSEL arrays in
5th International Workshop on Laser and Fiber-Optical Networks Modeling, 2003. Proceedings of LFNM 2003.
ABSTRACT
SPIE Proceedings, 2011
ABSTRACT Coherent laser beam combining is potentially attractive way to increase the output beam ... more ABSTRACT Coherent laser beam combining is potentially attractive way to increase the output beam brightness beyond the limits imposed on single-mode lasers by technological problems. Passive phase locking does not need complex external management. A specific feature of fiber amplifiers and lasers is that they possess optical path differences of many wavelengths magnitude. Cold-cavity theory of coherent laser beam combining predicts in this case rather low efficiency of beam combining even for an array of 8 lasers. Experiments, in contrast, demonstrated in such systems that high degree of phasing takes place for up to 20 lasers in an array. Possible explanation of this discrepancy may be associated with a number of factors. These factors are: gain saturation, intensity-dependent index, laser wavelength self-adjustment within the gain bandwidth. Besides, high degree of phase-locking can be established in self-sustained pulse periodic or spiky regime. Our approach takes injection controlled laser as a base unit of an ensemble. Beams from the neighboring lasers are injected into the reference laser in the array. Then a relationship between reference laser characteristics and whole wave field parameters can be found. As an example, fiber laser array with global coupling is numerically simulated with laser wavelength scanned within the gain bandwidth. Non-linear index is found to improve essentially passive phasing efficiency independent of the non-linearity sign.
Summaries of Papers Presented at the Lasers and Electro-Optics. CLEO '02. Technical Diges
We have realised true phase locking and selection of a single supermode in a circular array conta... more We have realised true phase locking and selection of a single supermode in a circular array containing 18 emitters. The multicore fibre laser (MCF) emits a diffraction limited beam (antiphase supermode) with an output power of about 6 W with a slope efficiency of about 22%.
SPIE Proceedings, 2005
ABSTRACT There is an increasing need for single-spatial-mode, edge-emitting semiconductor lasers ... more ABSTRACT There is an increasing need for single-spatial-mode, edge-emitting semiconductor lasers with reliable cw output power of around 1 W for applications such as pumps for rare-earth-doped fiber amplifiers and free-space communications. The design of respective devices is still a challenging task for experimenters, and software can assist very much in doing analyses of potentially perspective designs. We have developed a 3D numerical code supplied with a user-friendly interface for active diode-laser structures, taking into account light diffraction and carrier diffusion. The Watt-Ampere characteristics are calculated by changing the drive current density in the equation for the carrier-number density. To evaluate a single-mode stability limit, a procedure is developed to calculate 3-5 higher order optical modes on a 'frozen background': gain, carrier-induced index variation, as produced by the operated mode at a fixed drive level. Modal gains of these modes are compared to the calculated threshold gains for each mode. Because of non-uniform gain saturation by the operated mode, modal gains for higher-order modes increase with drive current due to beneficial overlap of their fields with the gain. When one of the higher-order modes approaches its threshold, this puts an upper limit for stable single-mode operation. A graphical interface allows for viewing near- and far-field patterns of any mode in the form of 3D surfaces or contour-plots. Scanning of profiles of mode intensity in an arbitrary cross section in the output plane and in far-field zone is available, too. Results of analyses of a number of published designs are reported.
The 17th Annual Meeting of the IEEELasers and Electro-Optics Society, 2004. LEOS 2004.
The paper focuses on the detailed modal property analysis of anti-guided VCSEL arrays and the app... more The paper focuses on the detailed modal property analysis of anti-guided VCSEL arrays and the application of an analytical approximation to explain the experimental spectral data.
AIP Conference Proceedings, 2010
ABSTRACT Coherent laser beam combining is potentially attractive way to increase the combined bea... more ABSTRACT Coherent laser beam combining is potentially attractive way to increase the combined beam brightness beyond the limits imposed on single‐mode lasers by technological bounds. The active control of every individual laser beam characteristics is more flexible but essentially more complicated in both, necessary equipment and service. Passive phase locking is an attractive alternative, since it does not need external management and leads to strong simplification of the system. A specific feature of fiber amplifiers and lasers is that they possess optical path differences (OPD) of many wavelengths magnitude. Cold‐cavity theory predicts in this case fast decline in efficiency of coherent fiber laser beam combining with number of lasers. Experiments, in contrast, demonstrated in such systems that high degree of phasing takes place for laser arrays of up to 16 lasers. As lasers are strong non‐linear systems, explanation of this discrepancy should rely on a role of non‐linear effects: gain saturation and intensity‐dependent index. Besides, since the gain band width is significantly broader than the distance between spectral lines responding to different longitudinal modes, it is a freedom in adjusting laser wavelength to a value, which corresponds to a best balance between gain and loss of laser radiation. As a first step, we consider a fiber laser array with external global coupling, which means that the same fraction of the combined laser beam is returned into the each element of the array. In this case, every laser in the array is operated as an injection controlled (slave) laser. The specific features of Yb‐doped fiber lasers were taken into account in our model: 1) existence of multiple longitudinal modes; 2) typically low‐Q cavity used in these lasers. This approach allows us to quantify the mechanism of laser wavelength self‐adjustment taking into account the effect of gain saturation. Taking the injection signal intensity within limits of locking range, the output signal was studied as a function of wavelength detuning and small signal gain magnitude. Then the maximal phase locking efficiency is found numerically as a function of coupling strength and of optical pumping intensity at random values of the OPD for laser arrays of variable size. Just the gain saturation effect taken into account in our model leads to comparatively slow reduction of the maximal phase locking efficiency with the laser array size.
CLEO/Europe. 2005 Conference on Lasers and Electro-Optics Europe, 2005., 2005
The purpose of this paper is the numerical modeling of the multi-core fibre laser (MCFL) taking i... more The purpose of this paper is the numerical modeling of the multi-core fibre laser (MCFL) taking into account the nonlinear effects in the active fiber: gain saturation and inversion induced refractive index variation. The simplest model of the laser array with parallel coupling has been considered, which allows investigating the aberrations and nonlinearity influence on the phase-locking efficiency
IEEE Journal of Quantum Electronics, 2006
A three-dimensional (3-D) above-threshold analysis has been performed for laterally antiguided la... more A three-dimensional (3-D) above-threshold analysis has been performed for laterally antiguided laser structures of the antiresonant-reflecting-optical-waveguide type, of relatively large core width (10 m), for high-power, single-spatial-mode operation. A 3-D numerical code has been developed, which takes into account carrier diffusion in the quantum well as well as edge radiation losses. The laser characteristics are calculated as functions of the above-threshold drive level. Within the simulation, 3-5 higher order optical modes on a "frozen background" are computed by the Arnoldi algorithm. Because of the nonuniform gain saturation of the lasing mode, the modal gains for higher order modes increase with the drive current due to increasing overlap of their fields with the two-dimensional gain distribution. The onset of threshold for higher order modes puts an upper limit on the range for stable single-mode operation. The above-threshold analysis is done for various values of the width of the reflector region, below and above the lateral-antiresonance condition. It is found that the maximum intermodal discrimination, which in turn provides the maximum single-mode power, is obtained when the reflector-region width is 25% larger that its value at antiresonance. Then, for 10-m-core devices, stable, single-mode operation is found to occur to drive levels as high as 41 threshold, with single-mode output powers as high as 1.45 W.
NUSOD '05. Proceedings of the 5th International Conference on Numerical Simulation of Optoelectronic Devices, 2005.
Optics Communications, May 1, 2002
Out-of-phase supermode with adjacent modes was selected in a multicore fiber (MCF) laser phase-lo... more Out-of-phase supermode with adjacent modes was selected in a multicore fiber (MCF) laser phase-locked by field propagation inside an annular waveguide (AW), which was butt coupled to the MCF. The individual emitters (microcores) were placed on a ring with a radius of 131 μm. The AW had a ring radius of 130 μm and a ring thickness of 25 μm. In this all-fiber system the radiation of the circular laser array was directly launched into the guiding ring of the AW. The emitted field distribution was reproduced by constructive multimode interference while propagating over the AW. This realized mutual coherence between the individual microcores. Numerical simulations of the field-propagation in the AW are presented. The influence of the ring thickness as well as the influence of geometrical parameter variations on the phase-locking properties of the system is investigated numerically.
Conference on Lasers and Electro-Optics, May 16, 2004
2D antiguided vertical cavity surface emitting laser array above threshold operation was studied ... more 2D antiguided vertical cavity surface emitting laser array above threshold operation was studied by 3D bi-directional beam propagation method and experimentally. 5/spl times/5 rectangular array emit in-phase mode up to >10 threshold in agreement with theory.
2019 IEEE 8th International Conference on Advanced Optoelectronics and Lasers (CAOL), 2019
Above threshold modelling of quantum cascade lasers is a complicated numerical problem due to gai... more Above threshold modelling of quantum cascade lasers is a complicated numerical problem due to gain spatial anisotropy and very strong thermal effects. We suggest semi-vectorial approach for 3D modelling of the quantum cascade laser, in which the wave field is considered as TM-like mode. Resonant antiguide array of lasers is modelled as an example. The heating is due to ohmic losses in the active regions. The single mode operation stability is studied by calculating the higher order modes when the gain and refractive index distribution are produced by the lasing mode.
2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC), 2019
Phase-locked array of diode lasers is an attractive way to achieve multi-Watt power single-mode o... more Phase-locked array of diode lasers is an attractive way to achieve multi-Watt power single-mode operation. Theoretical analysis of the optical modes of planarized phase-locked quantum cascade laser arrays (QCLA) emitting at 4.8 pm was performed in [1], [2]. These high-index-contract photonic crystal (HC-PC) structures allow global coupling between all array elements. Our numerical modelling predicts that even in the presence of strong thermal lensing under CW operation, 3-element QCLA can achieve more than 1W power.
6th International Conference on Laser and Fiber-Optical Networks Modeling, 2004. Proceedings of LFNM 2004.
ABSTRACT
Numerical modelling of quantum cascade laser (QCL) is a very complicated problem since the gain i... more Numerical modelling of quantum cascade laser (QCL) is a very complicated problem since the gain is spatially anisotropical in this type of laser. Besides, low efficiency results in very strong thermal effects in CW operation regime. QCL with embedded high index contrast structrures, such as resonant antiguided arrays, can achieve the output power level more than 1W in single spatial mode lasing. We present 3D model of such QCL, which is based on the semivectorial beam propagation method. The single mode operation stability is studied for pulse and CW operation regimes.
Theround-trip operator techniquie iswidely usedfordispersionless optical resonators beginning fro... more Theround-trip operator techniquie iswidely usedfordispersionless optical resonators beginning from pioneering studies ofFoxandLi.Resonator modesaredetermined astheeigen-functions oftherouind-trip operator andmaybecalculated bymeansofnumerical linear algebra. Corresponding complex eigen-valucs detcrmine the wavelength shifts relative toreference value anddamping factors. Dispersion elements, forexample, Bragg mirrors inVCSELresult independence ofpropagation operator onthewavelength anddamping factor. Wecandetermine theround-trip operator inthis casealso, butunknown values ofthewavelength anddamping factor enter into the operator byacomplicated manner. Trial-and-error method fordetermination ofwavelength shifts anddamping factors ispossible butitisverylaborious method, Theproposed proximate numerical method forcalculation of resonator modesisbased onsolution oflinear cigen-problem fortheround-trip operator withreference wavelength andzerodamping. Thewavelength shifts anddamping factor...
IEEE Journal of Quantum Electronics, 2019
A numerical model is developed for a phase-locked array of quantum cascade lasers. The population... more A numerical model is developed for a phase-locked array of quantum cascade lasers. The population density is derived from rate equations. The temperature distribution for stationary generation is produced by ohmic heating. It is shown that the results of above-threshold operation modeling by the semi-vectorial beam propagation method are in good agreement with the modal analysis provided by the vectorial-COMSOL solver supplemented with the Rigrod's model estimations. The wall-plug efficiency and the limits of the single-mode lasing are found. Thermal lensing is shown to be the main reason limiting the single-spatial-mode power under CW-operating conditions.
Problems of Atomic Science and Technology, Ser. Thermonuclear Fusion, 2018
Монитор эрозии предназначен для контроля процессов эрозии и напыления материалов на стенках вакуу... more Монитор эрозии предназначен для контроля процессов эрозии и напыления материалов на стенках вакуумной камеры токамака ИТЭР, проходящих под воздействием потоков излучения и частиц со стороны плазмы. Требуемые точность и диапазон измерений могут быть достигнуты с использованием метода двухволновой интерферометрии. Однако из-за вибрации конструкции установки снимки надо сделать за такой короткий промежуток времени, который не обеспечивают существующие фотокамеры. В данной работе предлагается использовать в интерферометре импульсный лазер с перестраиваемой длиной волны и рассматриваются способы регистрации интерферограмм в условиях вибраций. Проводятся оценки требуемых параметров лазера и анализ ожидаемых результатов. Ключевые слова: эрозия и напыление, первая стенка, интерферометрия, токамак ИТЭР, лазер.
The 16th Annual Meeting of the IEEE Lasers and Electro-Optics Society, 2003. LEOS 2003.
The in-phase mode emission in coupled VCSELs and 2D 4×4 VCSEL arrays has been reported using anti... more The in-phase mode emission in coupled VCSELs and 2D 4×4 VCSEL arrays has been reported using antiguided VCSEL elements. Two-step metalorganic chemical vapor deposition (MOCVD) is used for the growth of the antiguided VCSEL array structure. Here we demonstrate that in-phase mode operation can be achieved from very large aperture (up to 20×20) rectangular and triangular antiguided VCSEL arrays in
5th International Workshop on Laser and Fiber-Optical Networks Modeling, 2003. Proceedings of LFNM 2003.
ABSTRACT
SPIE Proceedings, 2011
ABSTRACT Coherent laser beam combining is potentially attractive way to increase the output beam ... more ABSTRACT Coherent laser beam combining is potentially attractive way to increase the output beam brightness beyond the limits imposed on single-mode lasers by technological problems. Passive phase locking does not need complex external management. A specific feature of fiber amplifiers and lasers is that they possess optical path differences of many wavelengths magnitude. Cold-cavity theory of coherent laser beam combining predicts in this case rather low efficiency of beam combining even for an array of 8 lasers. Experiments, in contrast, demonstrated in such systems that high degree of phasing takes place for up to 20 lasers in an array. Possible explanation of this discrepancy may be associated with a number of factors. These factors are: gain saturation, intensity-dependent index, laser wavelength self-adjustment within the gain bandwidth. Besides, high degree of phase-locking can be established in self-sustained pulse periodic or spiky regime. Our approach takes injection controlled laser as a base unit of an ensemble. Beams from the neighboring lasers are injected into the reference laser in the array. Then a relationship between reference laser characteristics and whole wave field parameters can be found. As an example, fiber laser array with global coupling is numerically simulated with laser wavelength scanned within the gain bandwidth. Non-linear index is found to improve essentially passive phasing efficiency independent of the non-linearity sign.
Summaries of Papers Presented at the Lasers and Electro-Optics. CLEO '02. Technical Diges
We have realised true phase locking and selection of a single supermode in a circular array conta... more We have realised true phase locking and selection of a single supermode in a circular array containing 18 emitters. The multicore fibre laser (MCF) emits a diffraction limited beam (antiphase supermode) with an output power of about 6 W with a slope efficiency of about 22%.
SPIE Proceedings, 2005
ABSTRACT There is an increasing need for single-spatial-mode, edge-emitting semiconductor lasers ... more ABSTRACT There is an increasing need for single-spatial-mode, edge-emitting semiconductor lasers with reliable cw output power of around 1 W for applications such as pumps for rare-earth-doped fiber amplifiers and free-space communications. The design of respective devices is still a challenging task for experimenters, and software can assist very much in doing analyses of potentially perspective designs. We have developed a 3D numerical code supplied with a user-friendly interface for active diode-laser structures, taking into account light diffraction and carrier diffusion. The Watt-Ampere characteristics are calculated by changing the drive current density in the equation for the carrier-number density. To evaluate a single-mode stability limit, a procedure is developed to calculate 3-5 higher order optical modes on a 'frozen background': gain, carrier-induced index variation, as produced by the operated mode at a fixed drive level. Modal gains of these modes are compared to the calculated threshold gains for each mode. Because of non-uniform gain saturation by the operated mode, modal gains for higher-order modes increase with drive current due to beneficial overlap of their fields with the gain. When one of the higher-order modes approaches its threshold, this puts an upper limit for stable single-mode operation. A graphical interface allows for viewing near- and far-field patterns of any mode in the form of 3D surfaces or contour-plots. Scanning of profiles of mode intensity in an arbitrary cross section in the output plane and in far-field zone is available, too. Results of analyses of a number of published designs are reported.
The 17th Annual Meeting of the IEEELasers and Electro-Optics Society, 2004. LEOS 2004.
The paper focuses on the detailed modal property analysis of anti-guided VCSEL arrays and the app... more The paper focuses on the detailed modal property analysis of anti-guided VCSEL arrays and the application of an analytical approximation to explain the experimental spectral data.
AIP Conference Proceedings, 2010
ABSTRACT Coherent laser beam combining is potentially attractive way to increase the combined bea... more ABSTRACT Coherent laser beam combining is potentially attractive way to increase the combined beam brightness beyond the limits imposed on single‐mode lasers by technological bounds. The active control of every individual laser beam characteristics is more flexible but essentially more complicated in both, necessary equipment and service. Passive phase locking is an attractive alternative, since it does not need external management and leads to strong simplification of the system. A specific feature of fiber amplifiers and lasers is that they possess optical path differences (OPD) of many wavelengths magnitude. Cold‐cavity theory predicts in this case fast decline in efficiency of coherent fiber laser beam combining with number of lasers. Experiments, in contrast, demonstrated in such systems that high degree of phasing takes place for laser arrays of up to 16 lasers. As lasers are strong non‐linear systems, explanation of this discrepancy should rely on a role of non‐linear effects: gain saturation and intensity‐dependent index. Besides, since the gain band width is significantly broader than the distance between spectral lines responding to different longitudinal modes, it is a freedom in adjusting laser wavelength to a value, which corresponds to a best balance between gain and loss of laser radiation. As a first step, we consider a fiber laser array with external global coupling, which means that the same fraction of the combined laser beam is returned into the each element of the array. In this case, every laser in the array is operated as an injection controlled (slave) laser. The specific features of Yb‐doped fiber lasers were taken into account in our model: 1) existence of multiple longitudinal modes; 2) typically low‐Q cavity used in these lasers. This approach allows us to quantify the mechanism of laser wavelength self‐adjustment taking into account the effect of gain saturation. Taking the injection signal intensity within limits of locking range, the output signal was studied as a function of wavelength detuning and small signal gain magnitude. Then the maximal phase locking efficiency is found numerically as a function of coupling strength and of optical pumping intensity at random values of the OPD for laser arrays of variable size. Just the gain saturation effect taken into account in our model leads to comparatively slow reduction of the maximal phase locking efficiency with the laser array size.
CLEO/Europe. 2005 Conference on Lasers and Electro-Optics Europe, 2005., 2005
The purpose of this paper is the numerical modeling of the multi-core fibre laser (MCFL) taking i... more The purpose of this paper is the numerical modeling of the multi-core fibre laser (MCFL) taking into account the nonlinear effects in the active fiber: gain saturation and inversion induced refractive index variation. The simplest model of the laser array with parallel coupling has been considered, which allows investigating the aberrations and nonlinearity influence on the phase-locking efficiency
IEEE Journal of Quantum Electronics, 2006
A three-dimensional (3-D) above-threshold analysis has been performed for laterally antiguided la... more A three-dimensional (3-D) above-threshold analysis has been performed for laterally antiguided laser structures of the antiresonant-reflecting-optical-waveguide type, of relatively large core width (10 m), for high-power, single-spatial-mode operation. A 3-D numerical code has been developed, which takes into account carrier diffusion in the quantum well as well as edge radiation losses. The laser characteristics are calculated as functions of the above-threshold drive level. Within the simulation, 3-5 higher order optical modes on a "frozen background" are computed by the Arnoldi algorithm. Because of the nonuniform gain saturation of the lasing mode, the modal gains for higher order modes increase with the drive current due to increasing overlap of their fields with the two-dimensional gain distribution. The onset of threshold for higher order modes puts an upper limit on the range for stable single-mode operation. The above-threshold analysis is done for various values of the width of the reflector region, below and above the lateral-antiresonance condition. It is found that the maximum intermodal discrimination, which in turn provides the maximum single-mode power, is obtained when the reflector-region width is 25% larger that its value at antiresonance. Then, for 10-m-core devices, stable, single-mode operation is found to occur to drive levels as high as 41 threshold, with single-mode output powers as high as 1.45 W.
NUSOD '05. Proceedings of the 5th International Conference on Numerical Simulation of Optoelectronic Devices, 2005.
Optics Communications, May 1, 2002
Out-of-phase supermode with adjacent modes was selected in a multicore fiber (MCF) laser phase-lo... more Out-of-phase supermode with adjacent modes was selected in a multicore fiber (MCF) laser phase-locked by field propagation inside an annular waveguide (AW), which was butt coupled to the MCF. The individual emitters (microcores) were placed on a ring with a radius of 131 μm. The AW had a ring radius of 130 μm and a ring thickness of 25 μm. In this all-fiber system the radiation of the circular laser array was directly launched into the guiding ring of the AW. The emitted field distribution was reproduced by constructive multimode interference while propagating over the AW. This realized mutual coherence between the individual microcores. Numerical simulations of the field-propagation in the AW are presented. The influence of the ring thickness as well as the influence of geometrical parameter variations on the phase-locking properties of the system is investigated numerically.