Christine Spiegelberg - Academia.edu (original) (raw)
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Papers by Christine Spiegelberg
2008 Conference on Lasers and Electro-Optics, 2008
Distributed feedback (DFB) phosphate glass fiber lasers that are cladding pumped with multimode d... more Distributed feedback (DFB) phosphate glass fiber lasers that are cladding pumped with multimode diodes have been demonstrated. Single and cascaded DFB lasers with outputs up to 160 mW and 1 W, respectively, have been achieved.
Polymer Photonic Devices, 1998
We observed laser emission in whispering gallery modes using a microring composed of a light-emit... more We observed laser emission in whispering gallery modes using a microring composed of a light-emitting semiconducting polymer poly[2,5-bis-(2'-ethylhexyloxy)-p- phenylenevinylene] (BEH-PPV) coated on an etched fiber under transient and quasi steady-state pumping conditions. The threshold for laser oscillation was 1 mJ/cm2 (0.1 MW/cm2) and 30 (mu) J/cm2 (300 MW/cm2) for nanosecond and femtosecond excitation, respectively. The laser output showed superlinear dependence
Polymer Photonic Devices, 1998
ABSTRACT We study the emission properties of various laser cavities under pulsed optical excitati... more ABSTRACT We study the emission properties of various laser cavities under pulsed optical excitation of the active semiconducting conjugated polymer material. Physical origin, magnitude, and dynamics of optical gain in these novel active laser materials are discussed leading to a selection of suitable cavity configurations for laser applications. We demonstrate laser action for various planar and ring resonator configurations that can be achieved in the regimes of transient inversion and quasi stationary excitation of the polymer material pumping with femtosecond and nanosecond pulses, respectively.
Univ., USA. We show how a superconducting coplanar microwave cavity can be used as a quantum limi... more Univ., USA. We show how a superconducting coplanar microwave cavity can be used as a quantum limited displacement transducer for a nanomechanical resonator by demonstrating that nanomechanical squeezing can be detected in the cavity field.
In recent years, semiconducting polymers have been widely used as the active medium in a variety ... more In recent years, semiconducting polymers have been widely used as the active medium in a variety of optoelectronic devices, such as light emitting diodes (LEDs),',' photo diode^,^ and light-emitting electrochemical cells (LECS).~ The fabrication of these thin film devices benefits from the good processability and solubility properties of this class of materials. Very recently, laser-like behavior in optically pumped solutions and films of a variety of luminescent polymers has been demon~ t r a t e d . ~ ~ The construction of optically pumped polymer lasers has been addressed in different ways. First, lasing was demonstrated5 in a dilute blend film of poly(2-methoxy-5(2'-ethyl-hexyloxy)1 -4-phenylenevinylene), MEH-PPV (<1%) in polystyrene (PS) containing a dispersion of TiO, nanoparticles, which confined the emitted photons by multiple scattering so that the distance traveled in the medium exceeded the gain length. The presence of the particles produced a dramatic collapse of the line width of the photoluminescence (PL) emission above a certain threshold. Second, laser-like behavior was demonstrated in neat and undiluted submicron-thick films of a broad range of polymers, with emission spectra spanning the visible spec tu" In this case the photon confinement was achieved by use of simple planar waveguide structures. The use of neat and undiluted films offers clear advantages, since a significant decrease in the threshold is observed when the concentration is increased [see results in Fig. 1 for Poly(2,5bis(cholestanoxy)-l,4-phenylene vinylene), BCHA]. It is also important to note that in this case the thresholds are several orders of magnitude lower than those achieved with the blend films containing TiO, particles. Finally, laser-like behavior has been also demonstrated by N. Tessler and coworkers in microcavity devices based on solid films of poly(pphenylenevinylene), PPV.'AlI these results are promising for the construction of electrically pumped solid state polymer diode lasers. However, the present lasing thresholds would require transient current densities of thousands of A/cm2. Therefore, one of our present objectives is E 100 I 7. N. Tessler, G. J. Denton, R. H. Friend, Nature 382,695 (1996).
Journal De Physique, 1988
Laser Resonators, Microresonators, and Beam Control XIV, 2012
17th International Conference on Optical Fibre Sensors
ABSTRACT
MRS Proceedings
Compact, robust, high power fiber lasers have been demonstrated. In fiber lasers of only a few cm... more Compact, robust, high power fiber lasers have been demonstrated. In fiber lasers of only a few cm length we obtained up to 10 W of cw output power, diffraction limited beam profiles at 4 W cw operation, 1.6 W output with single frequency operation, and more than 150 mW output with a spectral linewidth of a few kHz. The potential of active microstructured fibers for further improvements in fiber laser performance has been shown. We also demonstrated Q-switching and mode-locking of these compact fiber lasers.
Technical Digest. Summaries of Papers Presented at the Conference on Lasers and Electro-Optics. Conference Edition. 1998 Technical Digest Series, Vol.6 (IEEE Cat. No.98CH36178)
Stimulated emission has been reported in various semiconducting conjugated polymers, and the pros... more Stimulated emission has been reported in various semiconducting conjugated polymers, and the prospect of compact electrically pumped polymer lasers is exciting. Very recently, we were able to obtain unambiguous features of optically pumped laser emission from a poly[2,5-bis-(2'ethylhexyloxy)-p-phenylenevinylene] (BEH-PPV) film contained in a high-finesse Fabry-Perot cavity. Independent measurements revealed large optical gain that enables lasing in very small volumes, assuming
Ieee Photonics Technology Letters, Sep 1, 2005
2008 Conference on Lasers and Electro-Optics, 2008
Distributed feedback (DFB) phosphate glass fiber lasers that are cladding pumped with multimode d... more Distributed feedback (DFB) phosphate glass fiber lasers that are cladding pumped with multimode diodes have been demonstrated. Single and cascaded DFB lasers with outputs up to 160 mW and 1 W, respectively, have been achieved.
Polymer Photonic Devices, 1998
We observed laser emission in whispering gallery modes using a microring composed of a light-emit... more We observed laser emission in whispering gallery modes using a microring composed of a light-emitting semiconducting polymer poly[2,5-bis-(2&amp;amp;amp;amp;amp;amp;amp;amp;amp;#39;-ethylhexyloxy)-p- phenylenevinylene] (BEH-PPV) coated on an etched fiber under transient and quasi steady-state pumping conditions. The threshold for laser oscillation was 1 mJ/cm2 (0.1 MW/cm2) and 30 (mu) J/cm2 (300 MW/cm2) for nanosecond and femtosecond excitation, respectively. The laser output showed superlinear dependence
Polymer Photonic Devices, 1998
ABSTRACT We study the emission properties of various laser cavities under pulsed optical excitati... more ABSTRACT We study the emission properties of various laser cavities under pulsed optical excitation of the active semiconducting conjugated polymer material. Physical origin, magnitude, and dynamics of optical gain in these novel active laser materials are discussed leading to a selection of suitable cavity configurations for laser applications. We demonstrate laser action for various planar and ring resonator configurations that can be achieved in the regimes of transient inversion and quasi stationary excitation of the polymer material pumping with femtosecond and nanosecond pulses, respectively.
Univ., USA. We show how a superconducting coplanar microwave cavity can be used as a quantum limi... more Univ., USA. We show how a superconducting coplanar microwave cavity can be used as a quantum limited displacement transducer for a nanomechanical resonator by demonstrating that nanomechanical squeezing can be detected in the cavity field.
In recent years, semiconducting polymers have been widely used as the active medium in a variety ... more In recent years, semiconducting polymers have been widely used as the active medium in a variety of optoelectronic devices, such as light emitting diodes (LEDs),',' photo diode^,^ and light-emitting electrochemical cells (LECS).~ The fabrication of these thin film devices benefits from the good processability and solubility properties of this class of materials. Very recently, laser-like behavior in optically pumped solutions and films of a variety of luminescent polymers has been demon~ t r a t e d . ~ ~ The construction of optically pumped polymer lasers has been addressed in different ways. First, lasing was demonstrated5 in a dilute blend film of poly(2-methoxy-5(2'-ethyl-hexyloxy)1 -4-phenylenevinylene), MEH-PPV (<1%) in polystyrene (PS) containing a dispersion of TiO, nanoparticles, which confined the emitted photons by multiple scattering so that the distance traveled in the medium exceeded the gain length. The presence of the particles produced a dramatic collapse of the line width of the photoluminescence (PL) emission above a certain threshold. Second, laser-like behavior was demonstrated in neat and undiluted submicron-thick films of a broad range of polymers, with emission spectra spanning the visible spec tu" In this case the photon confinement was achieved by use of simple planar waveguide structures. The use of neat and undiluted films offers clear advantages, since a significant decrease in the threshold is observed when the concentration is increased [see results in Fig. 1 for Poly(2,5bis(cholestanoxy)-l,4-phenylene vinylene), BCHA]. It is also important to note that in this case the thresholds are several orders of magnitude lower than those achieved with the blend films containing TiO, particles. Finally, laser-like behavior has been also demonstrated by N. Tessler and coworkers in microcavity devices based on solid films of poly(pphenylenevinylene), PPV.'AlI these results are promising for the construction of electrically pumped solid state polymer diode lasers. However, the present lasing thresholds would require transient current densities of thousands of A/cm2. Therefore, one of our present objectives is E 100 I 7. N. Tessler, G. J. Denton, R. H. Friend, Nature 382,695 (1996).
Journal De Physique, 1988
Laser Resonators, Microresonators, and Beam Control XIV, 2012
17th International Conference on Optical Fibre Sensors
ABSTRACT
MRS Proceedings
Compact, robust, high power fiber lasers have been demonstrated. In fiber lasers of only a few cm... more Compact, robust, high power fiber lasers have been demonstrated. In fiber lasers of only a few cm length we obtained up to 10 W of cw output power, diffraction limited beam profiles at 4 W cw operation, 1.6 W output with single frequency operation, and more than 150 mW output with a spectral linewidth of a few kHz. The potential of active microstructured fibers for further improvements in fiber laser performance has been shown. We also demonstrated Q-switching and mode-locking of these compact fiber lasers.
Technical Digest. Summaries of Papers Presented at the Conference on Lasers and Electro-Optics. Conference Edition. 1998 Technical Digest Series, Vol.6 (IEEE Cat. No.98CH36178)
Stimulated emission has been reported in various semiconducting conjugated polymers, and the pros... more Stimulated emission has been reported in various semiconducting conjugated polymers, and the prospect of compact electrically pumped polymer lasers is exciting. Very recently, we were able to obtain unambiguous features of optically pumped laser emission from a poly[2,5-bis-(2'ethylhexyloxy)-p-phenylenevinylene] (BEH-PPV) film contained in a high-finesse Fabry-Perot cavity. Independent measurements revealed large optical gain that enables lasing in very small volumes, assuming
Ieee Photonics Technology Letters, Sep 1, 2005