Sylvain Girard - Academia.edu (original) (raw)
Papers by Sylvain Girard
Optics Letters, Feb 27, 2023
We report an efficient deep-UV master-oscillator power amplifier (MOPA) laser system at 229 nm th... more We report an efficient deep-UV master-oscillator power amplifier (MOPA) laser system at 229 nm that generates 350 ps pulses at 2 MHz repetition rate with an average power of 1.2 W. The use of a polarization-maintaining large mode area neodymium-doped fiber operating on the 4F3/2→4I9/2 transition allows high-power laser emission of up to 28 W near 915 nm in the sub-nanosecond regime with low spectral broadening. Two nonlinear frequency conversion stages (LBO + BBO crystals) in a single-pass configuration directly convert the IR laser emission to deep UV. This laser demonstrates the great potential of Nd3+-doped fiber lasers to produce high-power deep-UV emission.
Laser Congress 2021 (ASSL,LAC), 2021
We report a MOPA laser system near 910nm employing Nd-doped PM-fibers and a SESAM for mode-lockin... more We report a MOPA laser system near 910nm employing Nd-doped PM-fibers and a SESAM for mode-locking. SPM-induced spectral broadening in a W-type Nd-doped fiber amplifier allows pulse recompression to 300fs and pulse energy of 11nJ.
Fiber Lasers XIX: Technology and Systems, 2022
Optics Letters, 2021
We present a compact passively mode-locked fiber laser emitting near 910 nm with an all-polarizat... more We present a compact passively mode-locked fiber laser emitting near 910 nm with an all-polarization-maintaining fiber laser architecture. The ring-cavity laser configuration includes a core-pumped neodymium-doped fiber as a gain medium and a semiconductor saturable absorber mirror as a passive mode-locking element. A bandpass filter is used to suppress parasitic emission near 1.06 µm and allows wavelength tuning between 903 and 912 nm. The laser operates in a highly stable and self-starting all-normal-dispersion regime with a minimum pulse duration of 8 ps at 28.2 MHz pulse repetition rate and 0.2 nJ maximum pulse energy. A single-pass amplifier stage increases the pulse energy up to 1.5 nJ, and pulse compression with a pair of gratings is demonstrated with nearly Fourier transform limited pulses.
Laser Congress 2020 (ASSL, LAC), 2020
We present the first demonstration of a laser source at 226nm based on the frequency-quadrupling ... more We present the first demonstration of a laser source at 226nm based on the frequency-quadrupling of an all-PM Nd-doped fiber laser. The DUV laser delivers 175mW of average power, 50ns pulse at 30kHz repetition rate.
We present in this work, the development of a nanosecond pulsed Master-Oscillator Power-Amplifier... more We present in this work, the development of a nanosecond pulsed Master-Oscillator Power-Amplifier (MOPA) laser system near 905 nm based on the 3-level transition of Neodymium using a novel low NA polarization-maintaining Nd-doped silica fiber with a 30µm core and 130µm cladding. The MOPA delivered up to 24 W of average power (0.6 mJ energy per pulse) with good beam quality (M²~1.4). Cascaded LBO and BBO crystals are used respectively for second-harmonic generation and fourth-harmonic generation, giving respectively average output powers of 4.9W at 452nm (conversion efficiency of 20%) and 550mW at 226nm (conversion efficiency of 10%).
Laser Congress 2019 (ASSL, LAC, LS&C), 2019
13 W output power near 900 nm in CW laser regime (beam quality factor M2~1.2) and pulse energy of... more 13 W output power near 900 nm in CW laser regime (beam quality factor M2~1.2) and pulse energy of 0.54 mJ in actively Q-switched regime was obtained using 30-µm diameter core, low-NA (0.045) Neodymium-doped fiber.
Frontiers in Optics 2015, 2015
High-power and tunable operation of Nd-doped fiber lasers at wavelengths as short as 872nm is rep... more High-power and tunable operation of Nd-doped fiber lasers at wavelengths as short as 872nm is reported. Using a reflective VBG, we showed a narrow linewidth (~35pm) laser emission with a maximum output power of 22W.
Advanced Solid State Lasers, 2015
We report results on high-power and tunable three-level Nd-doped fiber lasers. Using a reflective... more We report results on high-power and tunable three-level Nd-doped fiber lasers. Using a reflective VBG, laser wavelengths as short as 872 nm are achieved in CW regime with a narrow linewidth of 35 pm.
Optics Letters, 2015
Efficient operation of an Nd-doped fiber laser operating in a wavelength-tunable configuration us... more Efficient operation of an Nd-doped fiber laser operating in a wavelength-tunable configuration using a volume Bragg grating (VBG) is reported in this Letter. A high-power operation on the 4F3/2-4I9/2 transition of Nd3+ at short wavelengths below 900 nm is demonstrated for the first time in silica fibers. A high-efficiency (47% laser conversion) output power up to 22 W and a narrow linewidth of 0.035 nm are achieved. This configuration is compared with a more conventional fiber laser setup using a bandpass filter and a highly reflective dichroic mirror.
Advances in Optical Materials, 2011
ABSTRACT We present a CW/pulsed master oscillator-power amplifier (MOPA) fiber source operating n... more ABSTRACT We present a CW/pulsed master oscillator-power amplifier (MOPA) fiber source operating near 980nm and based on an Yb-doped fiber pumped by a Nd-doped fiber laser at 930nm. Up to 2.1W was obtained in CW regime with a slope efficiency of 81%.
Frontiers in Optics 2011/Laser Science XXVII, 2011
Optics Letters, 2013
We demonstrate a double-clad fiber laser operating at 910 nm with a record power of 20 W. Laser e... more We demonstrate a double-clad fiber laser operating at 910 nm with a record power of 20 W. Laser emission on the three-level scheme is enabled by the combination of a small inner cladding-to-core diameter ratio and a high brightness pump source at 808 nm. A laser conversion efficiency as high as 44% was achieved in CW operating regime by using resonant fiber Bragg reflectors at 910 nm that prevent the lasing at the 1060 nm competing wavelength. Furthermore, in a master oscillator power-amplifier scheme, an amplified power of 14.8 W was achieved at 914 nm in the same fiber.
Journal of Physics: Conference Series, 2012
Optics Express, 2021
We present the first frequency-quadrupled linearly-polarized Q-switched neodymium-doped fiber las... more We present the first frequency-quadrupled linearly-polarized Q-switched neodymium-doped fiber laser generating > 500 mW average power at 226 nm. For this purpose, an amplified Q-switched oscillator using novel large-mode-area (LMA) fibers and generating up to 24 W average power (15 kW peak power) at 905 nm was developed. Two nonlinear frequency conversion stages using a LBO crystal for SHG and a BBO crystal for FHG generate respectively up to 4.9 W average power in the deep blue at 452 nm and a maximum of 510 mW average power in the deep ultra-violet (DUV) at 226 nm. Performance limitations and further improvements are discussed.
2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference (CLEO EUROPE/EQEC), 2011
ABSTRACT We demonstrate dynamical amplification of phase conjugation in the gain medium of a Nd3+... more ABSTRACT We demonstrate dynamical amplification of phase conjugation in the gain medium of a Nd3+:YVO4 laser via excitation of its relaxation oscillations. Enhancement up to +30 dB compared to classical homodyne approach is observed.
MRS Proceedings, 2009
Heterodyne optical feedback on a class B laser is investigated for Scanning Near field Optical Mi... more Heterodyne optical feedback on a class B laser is investigated for Scanning Near field Optical Microscopy (SNOM). All-fiberized set-up combining an Er-doped Distributed Feedback (DFB) fiber laser, a pair of pigtailed acousto-optics modulators (AOM) and a shear-force based scanning probe technique has been developed for the simultaneous observation of topography and evanescent light field on integrated optical devices. First demonstration of imaging using this technique is illustrated by characterizing the propagating modes into a rib waveguide at 1.54μm. Comparison between a theoretical model based on beam propagation mode (BPM) simulations and experimental measurements validates the results.
Optics Communications, 2001
Optics Letters, Feb 27, 2023
We report an efficient deep-UV master-oscillator power amplifier (MOPA) laser system at 229 nm th... more We report an efficient deep-UV master-oscillator power amplifier (MOPA) laser system at 229 nm that generates 350 ps pulses at 2 MHz repetition rate with an average power of 1.2 W. The use of a polarization-maintaining large mode area neodymium-doped fiber operating on the 4F3/2→4I9/2 transition allows high-power laser emission of up to 28 W near 915 nm in the sub-nanosecond regime with low spectral broadening. Two nonlinear frequency conversion stages (LBO + BBO crystals) in a single-pass configuration directly convert the IR laser emission to deep UV. This laser demonstrates the great potential of Nd3+-doped fiber lasers to produce high-power deep-UV emission.
Laser Congress 2021 (ASSL,LAC), 2021
We report a MOPA laser system near 910nm employing Nd-doped PM-fibers and a SESAM for mode-lockin... more We report a MOPA laser system near 910nm employing Nd-doped PM-fibers and a SESAM for mode-locking. SPM-induced spectral broadening in a W-type Nd-doped fiber amplifier allows pulse recompression to 300fs and pulse energy of 11nJ.
Fiber Lasers XIX: Technology and Systems, 2022
Optics Letters, 2021
We present a compact passively mode-locked fiber laser emitting near 910 nm with an all-polarizat... more We present a compact passively mode-locked fiber laser emitting near 910 nm with an all-polarization-maintaining fiber laser architecture. The ring-cavity laser configuration includes a core-pumped neodymium-doped fiber as a gain medium and a semiconductor saturable absorber mirror as a passive mode-locking element. A bandpass filter is used to suppress parasitic emission near 1.06 µm and allows wavelength tuning between 903 and 912 nm. The laser operates in a highly stable and self-starting all-normal-dispersion regime with a minimum pulse duration of 8 ps at 28.2 MHz pulse repetition rate and 0.2 nJ maximum pulse energy. A single-pass amplifier stage increases the pulse energy up to 1.5 nJ, and pulse compression with a pair of gratings is demonstrated with nearly Fourier transform limited pulses.
Laser Congress 2020 (ASSL, LAC), 2020
We present the first demonstration of a laser source at 226nm based on the frequency-quadrupling ... more We present the first demonstration of a laser source at 226nm based on the frequency-quadrupling of an all-PM Nd-doped fiber laser. The DUV laser delivers 175mW of average power, 50ns pulse at 30kHz repetition rate.
We present in this work, the development of a nanosecond pulsed Master-Oscillator Power-Amplifier... more We present in this work, the development of a nanosecond pulsed Master-Oscillator Power-Amplifier (MOPA) laser system near 905 nm based on the 3-level transition of Neodymium using a novel low NA polarization-maintaining Nd-doped silica fiber with a 30µm core and 130µm cladding. The MOPA delivered up to 24 W of average power (0.6 mJ energy per pulse) with good beam quality (M²~1.4). Cascaded LBO and BBO crystals are used respectively for second-harmonic generation and fourth-harmonic generation, giving respectively average output powers of 4.9W at 452nm (conversion efficiency of 20%) and 550mW at 226nm (conversion efficiency of 10%).
Laser Congress 2019 (ASSL, LAC, LS&C), 2019
13 W output power near 900 nm in CW laser regime (beam quality factor M2~1.2) and pulse energy of... more 13 W output power near 900 nm in CW laser regime (beam quality factor M2~1.2) and pulse energy of 0.54 mJ in actively Q-switched regime was obtained using 30-µm diameter core, low-NA (0.045) Neodymium-doped fiber.
Frontiers in Optics 2015, 2015
High-power and tunable operation of Nd-doped fiber lasers at wavelengths as short as 872nm is rep... more High-power and tunable operation of Nd-doped fiber lasers at wavelengths as short as 872nm is reported. Using a reflective VBG, we showed a narrow linewidth (~35pm) laser emission with a maximum output power of 22W.
Advanced Solid State Lasers, 2015
We report results on high-power and tunable three-level Nd-doped fiber lasers. Using a reflective... more We report results on high-power and tunable three-level Nd-doped fiber lasers. Using a reflective VBG, laser wavelengths as short as 872 nm are achieved in CW regime with a narrow linewidth of 35 pm.
Optics Letters, 2015
Efficient operation of an Nd-doped fiber laser operating in a wavelength-tunable configuration us... more Efficient operation of an Nd-doped fiber laser operating in a wavelength-tunable configuration using a volume Bragg grating (VBG) is reported in this Letter. A high-power operation on the 4F3/2-4I9/2 transition of Nd3+ at short wavelengths below 900 nm is demonstrated for the first time in silica fibers. A high-efficiency (47% laser conversion) output power up to 22 W and a narrow linewidth of 0.035 nm are achieved. This configuration is compared with a more conventional fiber laser setup using a bandpass filter and a highly reflective dichroic mirror.
Advances in Optical Materials, 2011
ABSTRACT We present a CW/pulsed master oscillator-power amplifier (MOPA) fiber source operating n... more ABSTRACT We present a CW/pulsed master oscillator-power amplifier (MOPA) fiber source operating near 980nm and based on an Yb-doped fiber pumped by a Nd-doped fiber laser at 930nm. Up to 2.1W was obtained in CW regime with a slope efficiency of 81%.
Frontiers in Optics 2011/Laser Science XXVII, 2011
Optics Letters, 2013
We demonstrate a double-clad fiber laser operating at 910 nm with a record power of 20 W. Laser e... more We demonstrate a double-clad fiber laser operating at 910 nm with a record power of 20 W. Laser emission on the three-level scheme is enabled by the combination of a small inner cladding-to-core diameter ratio and a high brightness pump source at 808 nm. A laser conversion efficiency as high as 44% was achieved in CW operating regime by using resonant fiber Bragg reflectors at 910 nm that prevent the lasing at the 1060 nm competing wavelength. Furthermore, in a master oscillator power-amplifier scheme, an amplified power of 14.8 W was achieved at 914 nm in the same fiber.
Journal of Physics: Conference Series, 2012
Optics Express, 2021
We present the first frequency-quadrupled linearly-polarized Q-switched neodymium-doped fiber las... more We present the first frequency-quadrupled linearly-polarized Q-switched neodymium-doped fiber laser generating > 500 mW average power at 226 nm. For this purpose, an amplified Q-switched oscillator using novel large-mode-area (LMA) fibers and generating up to 24 W average power (15 kW peak power) at 905 nm was developed. Two nonlinear frequency conversion stages using a LBO crystal for SHG and a BBO crystal for FHG generate respectively up to 4.9 W average power in the deep blue at 452 nm and a maximum of 510 mW average power in the deep ultra-violet (DUV) at 226 nm. Performance limitations and further improvements are discussed.
2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference (CLEO EUROPE/EQEC), 2011
ABSTRACT We demonstrate dynamical amplification of phase conjugation in the gain medium of a Nd3+... more ABSTRACT We demonstrate dynamical amplification of phase conjugation in the gain medium of a Nd3+:YVO4 laser via excitation of its relaxation oscillations. Enhancement up to +30 dB compared to classical homodyne approach is observed.
MRS Proceedings, 2009
Heterodyne optical feedback on a class B laser is investigated for Scanning Near field Optical Mi... more Heterodyne optical feedback on a class B laser is investigated for Scanning Near field Optical Microscopy (SNOM). All-fiberized set-up combining an Er-doped Distributed Feedback (DFB) fiber laser, a pair of pigtailed acousto-optics modulators (AOM) and a shear-force based scanning probe technique has been developed for the simultaneous observation of topography and evanescent light field on integrated optical devices. First demonstration of imaging using this technique is illustrated by characterizing the propagating modes into a rib waveguide at 1.54μm. Comparison between a theoretical model based on beam propagation mode (BPM) simulations and experimental measurements validates the results.
Optics Communications, 2001