The Experts below are selected from a list of 4560 Experts worldwide ranked by ideXlab platform
Martin Richardson - One of the best experts on this subject based on the ideXlab platform.
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Spectral Narrowing and stabilization of thulium fiber lasers using guided mode resonance filters
Optics Letters, 2011Co-Authors: Andrew R Sims, Zachary A Roth, Christina C C Willis, Pankaj Kadwani, Timothy S Mccomb, Lawrence Shah, Vikas Sudesh, Menelaos K Poutous, Eric G Johnson, Martin RichardsonAbstract:We used guided-mode resonance filters (GMRFs), fabricated using thin-film deposition and chemical etching, as intracavity feedback elements to stabilize and narrow the output spectrum in thulium-doped fiber oscillators operating in the 2 μm wavelength regime, producing linewidths of <700 pm up to 10 W power levels. A Tm fiber-based amplified spontaneous emission source was used to characterize the reflective properties of the GMRFs. Linewidths of 500 pm and a 7.3 dB reduction in transmission were measured on resonances.
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volume bragg grating assisted broadband tunability and Spectral Narrowing of ti sapphire oscillators
Optics Express, 2009Co-Authors: Michael Hemmer, Leonid B Glebov, Michael Bass, Yann Joly, Martin RichardsonAbstract:A widely tunable, narrow band Ti:Sapphire oscillator is reported. Tunability and Spectral Narrowing were achieved by use of a volume Bragg grating in the cavity. Tunability was observed from 785 nm to 852 nm while maintaining a Spectral linewidth less than 10 pm with essentially no Spectral jitter. Oscillation on only 2 longitudinal modes is also reported at 852 nm with the grating at normal incidence providing ~200 mW output power.
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Spectral Narrowing in a dual volume bragg grating ti sapphire oscillator
Conference on Lasers and Electro-Optics, 2007Co-Authors: Michael Hemmer, Vadim Smirnov, Teyuan Chung, Ying Chen, L B Glebov, Martin Richardson, Michael BassAbstract:Spectral Narrowing of Ti:sapphire down to two longitudinal modes has been achieved in the 3 W pump power range and 200 mW output using a compact design. Further improvements leading to single mode operation are discussed.
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Spectral Narrowing of solid state lasers by narrow band ptr bragg mirrors
Laser source and system technology for defense and security. Conference, 2006Co-Authors: Teyuan Chung, Vadim Smirnov, Leonid B Glebov, Michael Hemmer, Ying Chen, Martin Richardson, Alexandra Rapaport, Michael BassAbstract:Dramatic Spectral Narrowing of normally broad band lasers, Ti:Sapphire,Cr:LiSAF, and alexandrite was achieved by simply replacing the output mirror with a reflective, volumetric Bragg grating recorded in photo thermal refractive (PTR) glass. The output power of each laser was changed very slightly from that obtained using dielectric coated output mirrors with the same output coupling as the Bragg grating while Spectral brightness increased by about three orders of magnitude.
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solid state laser Spectral Narrowing using a volumetric photothermal refractive bragg grating cavity mirror
Optics Letters, 2006Co-Authors: Teyuan Chung, Vadim Smirnov, Leonid B Glebov, Martin Richardson, Alexandra Rapaport, Michael BassAbstract:Dramatic Spectral Narrowing of two normally broadband lasers, Ti:sapphire and Cr:LiSAF, was achieved by simply replacing the output mirror with a reflective, volumetric Bragg grating recorded in photothermal refractive glass. The output power of each laser was unchanged from that obtained using dielectric coated output mirrors with the same output coupling as the Bragg grating while Spectral brightness increased by 3 orders of magnitude.
Michael Bass - One of the best experts on this subject based on the ideXlab platform.
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volume bragg grating assisted broadband tunability and Spectral Narrowing of ti sapphire oscillators
Optics Express, 2009Co-Authors: Michael Hemmer, Leonid B Glebov, Michael Bass, Yann Joly, Martin RichardsonAbstract:A widely tunable, narrow band Ti:Sapphire oscillator is reported. Tunability and Spectral Narrowing were achieved by use of a volume Bragg grating in the cavity. Tunability was observed from 785 nm to 852 nm while maintaining a Spectral linewidth less than 10 pm with essentially no Spectral jitter. Oscillation on only 2 longitudinal modes is also reported at 852 nm with the grating at normal incidence providing ~200 mW output power.
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Spectral Narrowing in a dual volume bragg grating ti sapphire oscillator
Conference on Lasers and Electro-Optics, 2007Co-Authors: Michael Hemmer, Vadim Smirnov, Teyuan Chung, Ying Chen, L B Glebov, Martin Richardson, Michael BassAbstract:Spectral Narrowing of Ti:sapphire down to two longitudinal modes has been achieved in the 3 W pump power range and 200 mW output using a compact design. Further improvements leading to single mode operation are discussed.
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Spectral Narrowing of solid state lasers by narrow band ptr bragg mirrors
Laser source and system technology for defense and security. Conference, 2006Co-Authors: Teyuan Chung, Vadim Smirnov, Leonid B Glebov, Michael Hemmer, Ying Chen, Martin Richardson, Alexandra Rapaport, Michael BassAbstract:Dramatic Spectral Narrowing of normally broad band lasers, Ti:Sapphire,Cr:LiSAF, and alexandrite was achieved by simply replacing the output mirror with a reflective, volumetric Bragg grating recorded in photo thermal refractive (PTR) glass. The output power of each laser was changed very slightly from that obtained using dielectric coated output mirrors with the same output coupling as the Bragg grating while Spectral brightness increased by about three orders of magnitude.
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solid state laser Spectral Narrowing using a volumetric photothermal refractive bragg grating cavity mirror
Optics Letters, 2006Co-Authors: Teyuan Chung, Vadim Smirnov, Leonid B Glebov, Martin Richardson, Alexandra Rapaport, Michael BassAbstract:Dramatic Spectral Narrowing of two normally broadband lasers, Ti:sapphire and Cr:LiSAF, was achieved by simply replacing the output mirror with a reflective, volumetric Bragg grating recorded in photothermal refractive glass. The output power of each laser was unchanged from that obtained using dielectric coated output mirrors with the same output coupling as the Bragg grating while Spectral brightness increased by 3 orders of magnitude.
H Murakami - One of the best experts on this subject based on the ideXlab platform.
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persistent optical hole burning spectroscopy of nano confined dye molecules in liquid at room temperature Spectral Narrowing due to a glassy state and extraordinary relaxation in a nano cage
Journal of Chemical Physics, 2018Co-Authors: H MurakamiAbstract:Persistent optical hole-burning spectroscopy has been conducted for a dye molecule within a very small (∼1 nm) reverse micelle at room temperature. The spectra show a Spectral Narrowing due to site-selective excitation. This definitely demonstrates that the surroundings of the dye molecule are in a glassy state regardless of a solution at room temperature. On the other hand, the hole-burning spectra exhibit large shifts from excitation frequencies, and their positions are almost independent of excitation frequencies. The hole-burning spectra have been theoretically calculated by taking account of a vibronic absorption band of the dye molecule under the assumption that the surroundings of the dye molecule are in a glassy state. The calculated results agree with the experimental ones that were obtained for the dye molecule in a polymer glass for comparison, where it has been found that the ratio of hole-burning efficiencies of vibronic- to electronic-band excitations is quite high. On the other hand, the th...
John R Marciante - One of the best experts on this subject based on the ideXlab platform.
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Spectral Narrowing and stabilization of 10 w broad area laser with fiber pump delivery system
IEEE Photonics Technology Letters, 2019Co-Authors: Jose C Perez, Jordan P Leidner, John R MarcianteAbstract:The emission spectrum of a 10-W commercial broad-area laser operated at full power was narrowed and stabilized by coupling an off-axis portion of its far-field emission to a single-mode fiber Bragg grating. The feedback produced in this partial compound cavity configuration narrowed the FWHM linewidth of the laser by $7\times $ compared with the free-running case and stabilized its peak wavelength over a 7° temperature range. Furthermore, the feedback improved the Spectral density of the emission by $2\times $ over a 1.5° temperature range and over most of the far-field emission angles, indicating a robust concept suitable for manufacturing. This proof-of-concept experiment can be translated into a fiber pump delivery system that can capture all the broad-area laser (BAL) output while providing feedback to improve the Spectral and potentially spatial properties of BAL emission.
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Spectral Narrowing and stabilization of 10 w broad area laser with fiber pump delivery system conference presentation
High-Power Diode Laser Technology XVI, 2018Co-Authors: Jose C Perez, Jordan P Leidner, John R MarcianteAbstract:The emission spectrum of a 10-W commercial broad-area laser was narrowed and stabilized by coupling a portion of its far-field emission to a single-mode fiber Bragg grating. The feedback produced in this external cavity configuration stabilized the peak wavelength of the laser with respect to temperature and produced a narrow spectrum compatible with pumping ytterbium-doped fiber lasers. The Spectral Narrowing was achieved at multiple far field locations and stabilized over a wide temperature band, indicating a robust and manufacturable design. This proof-of-concept experiment can be translated into a pump delivery fiber configuration that integrates the diode feedback into a pump system package for Spectrally bright pumping.
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Spectral Narrowing and stabilization for broad area lasers via modified delivery fiber
IEEE Photonics Technology Letters, 2015Co-Authors: Jordan P Leidner, John R MarcianteAbstract:A proof-of-concept experiment for fiber-based broad-area laser stabilization is experimentally demonstrated using coupling optics and a 1-nm wide, 98% reflectivity fiber Bragg grating. The output spectrum of a 3-W, 100- $\mu \text{m}$ wide, 2-mm long commercial broad-area laser was narrowed by more than $10\times $ to 0.26-nm full-width half-max. In addition, the system showed 7%–13% enhanced output power. The system also shows potential for slow-axis beam quality improvement in the desired operating regime. A pump delivery fiber scheme is proposed for integration of the diode feedback into a pump system package for enhanced-brightness fiber pumping.
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fiber pump delivery system for Spectral Narrowing and wavelength stabilization of broad area lasers
Conference on Lasers and Electro-Optics, 2015Co-Authors: Jordan P Leidner, John R MarcianteAbstract:Off-axis far-field coupling of a broad-area laser to a single-mode fiber containing a fiber Bragg grating is used for spatio-Spectral filtering. This results in a ∼10x narrower Spectral width and potential spatial brightness improvements.
Michael Hemmer - One of the best experts on this subject based on the ideXlab platform.
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addressing Spectral Narrowing in cryogenic yb yag a 10 mj cryogenic yb ylf regenerative amplifier
Lasers Congress 2016 (ASSL LSC LAC) (2016) paper ATh4A.3, 2016Co-Authors: Michael Hemmer, Luis E Zapata, Yi Hua, Franz X KartnerAbstract:We report a Yb:YLF based 10 mJ-class cryogenically-cooled regenerative amplifier with 2.1 nm FWHM Spectral bandwidth. This system demonstrates the feasibility of high energy, sub-ps cryogenic lasers as an alternative to room temperature Yb:YAG.
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volume bragg grating assisted broadband tunability and Spectral Narrowing of ti sapphire oscillators
Optics Express, 2009Co-Authors: Michael Hemmer, Leonid B Glebov, Michael Bass, Yann Joly, Martin RichardsonAbstract:A widely tunable, narrow band Ti:Sapphire oscillator is reported. Tunability and Spectral Narrowing were achieved by use of a volume Bragg grating in the cavity. Tunability was observed from 785 nm to 852 nm while maintaining a Spectral linewidth less than 10 pm with essentially no Spectral jitter. Oscillation on only 2 longitudinal modes is also reported at 852 nm with the grating at normal incidence providing ~200 mW output power.
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Spectral Narrowing in a dual volume bragg grating ti sapphire oscillator
Conference on Lasers and Electro-Optics, 2007Co-Authors: Michael Hemmer, Vadim Smirnov, Teyuan Chung, Ying Chen, L B Glebov, Martin Richardson, Michael BassAbstract:Spectral Narrowing of Ti:sapphire down to two longitudinal modes has been achieved in the 3 W pump power range and 200 mW output using a compact design. Further improvements leading to single mode operation are discussed.
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Spectral Narrowing of solid state lasers by narrow band ptr bragg mirrors
Laser source and system technology for defense and security. Conference, 2006Co-Authors: Teyuan Chung, Vadim Smirnov, Leonid B Glebov, Michael Hemmer, Ying Chen, Martin Richardson, Alexandra Rapaport, Michael BassAbstract:Dramatic Spectral Narrowing of normally broad band lasers, Ti:Sapphire,Cr:LiSAF, and alexandrite was achieved by simply replacing the output mirror with a reflective, volumetric Bragg grating recorded in photo thermal refractive (PTR) glass. The output power of each laser was changed very slightly from that obtained using dielectric coated output mirrors with the same output coupling as the Bragg grating while Spectral brightness increased by about three orders of magnitude.
