The Experts below are selected from a list of 315 Experts worldwide ranked by ideXlab platform
K.-i. Ueda - One of the best experts on this subject based on the ideXlab platform.
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Sub-nanosecond passively Q-switched Yb:YAG/Cr^4+:YAG sandwiched microchip laser
Applied Physics B, 2006Co-Authors: J. Dong, A. Shirakawa, K.-i. UedaAbstract:We report on laser-diode pumped low-threshold, and compact passively Q-switched Yb:YAG microchip lasers, with Cr^4+:YAG crystals as the saturable absorbers. The laser threshold at the fundamental wavelength of 1.03 μm is as low as 0.25 W, and the slope efficiency is as high as 36.8%, and the optical-to-optical efficiency is as high as 27% for the 95% Initial Transmission of the Cr^4+:YAG crystal. A pulse width of 1.35 ns and peak power of over 8.2 kW was obtained. Using a 5 mm thick KTP crystal as the second-harmonic generation medium, 514.7 nm green light of 155 mW power was generated. The pulse duration of 480 ps was generated at 1.03 μm by using 85% of the Initial Transmission of the Cr^4+:YAG saturable absorber. Stable single-longitudinal-mode oscillation and wide-separated multi-longitudinal-mode oscillation due to the etalon effect of the Cr^4+:YAG thin plate was achieved at different pump power levels.
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Sub-nanosecond passively Q-switched Yb : YAG/Cr4+: YAG sandwiched microchip laser
Applied Physics B, 2006Co-Authors: Jun Dong, Akira Shirakawa, K.-i. UedaAbstract:We report on laser-diode pumped low-threshold, and compact passively Q-switched Yb:YAG microchip lasers, with Cr4+:YAG crystals as the saturable absorbers. The laser threshold at the fundamental wavelength of 1.03 μm is as low as 0.25 W, and the slope efficiency is as high as 36.8%, and the optical-to-optical efficiency is as high as 27% for the 95% Initial Transmission of the Cr4+:YAG crystal. A pulse width of 1.35 ns and peak power of over 8.2 kW was obtained. Using a 5 mm thick KTP crystal as the second-harmonic generation medium, 514.7 nm green light of 155 mW power was generated. The pulse duration of 480 ps was generated at 1.03 μm by using 85% of the Initial Transmission of the Cr4+:YAG saturable absorber. Stable single-longitudinal-mode oscillation and wide-separated multi-longitudinal-mode oscillation due to the etalon effect of the Cr4+:YAG thin plate was achieved at different pump power levels.
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Passively Q-switched ceramic Nd 3+ :YAG/Cr 4+ :YAG lasers
Applied Optics, 2004Co-Authors: Yan Feng, K.-i. Ueda, Jianren Lu, Kazunori Takaichi, Hideki Yagi, Takagimi Yanagitani, Alexander A. KaminskiiAbstract:Passively Q-switched ceramic Nd3+:YAG lasers with ceramic Cr4+:YAG saturable absorbers are demonstrated. When the lasers are pumped by a 1-W cw laser diode, optical-optical efficiency as great as 22% is obtained with Cr4+:YAG of Initial Transmission ranging from 94% to 79%. The results are similar to those in their crystalline counterparts. The operation of Brewster’s angle and the polarization state of the laser output are also investigated.
J. Dong - One of the best experts on this subject based on the ideXlab platform.
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Passively Q-switched Yb:YAG/Cr:YAG ceramics miniature lasers with peak power ≫ 150 kW and nearly diffraction-limited beam quality
2007 European Conference on Lasers and Electro-Optics and the International Quantum Electronics Conference, 2007Co-Authors: J. Dong, A. Shirakawa, K. Ueda, H. Yagi, T. YanagitaniAbstract:Here we report on the high peak power laser performance of Yb:YAG/Cr:YAG all-ceramic miniature laser by using low Initial Transmission of the Cr4+:YAG and high Transmission of the output coupler.
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Sub-nanosecond passively Q-switched Yb:YAG/Cr^4+:YAG sandwiched microchip laser
Applied Physics B, 2006Co-Authors: J. Dong, A. Shirakawa, K.-i. UedaAbstract:We report on laser-diode pumped low-threshold, and compact passively Q-switched Yb:YAG microchip lasers, with Cr^4+:YAG crystals as the saturable absorbers. The laser threshold at the fundamental wavelength of 1.03 μm is as low as 0.25 W, and the slope efficiency is as high as 36.8%, and the optical-to-optical efficiency is as high as 27% for the 95% Initial Transmission of the Cr^4+:YAG crystal. A pulse width of 1.35 ns and peak power of over 8.2 kW was obtained. Using a 5 mm thick KTP crystal as the second-harmonic generation medium, 514.7 nm green light of 155 mW power was generated. The pulse duration of 480 ps was generated at 1.03 μm by using 85% of the Initial Transmission of the Cr^4+:YAG saturable absorber. Stable single-longitudinal-mode oscillation and wide-separated multi-longitudinal-mode oscillation due to the etalon effect of the Cr^4+:YAG thin plate was achieved at different pump power levels.
Jingliang He - One of the best experts on this subject based on the ideXlab platform.
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Passively Q‐switched mode‐locking in a diode‐pumped c‐cut Nd:LuVO4 laser with Cr4+:YAG
Laser Physics Letters, 2009Co-Authors: Jingliang He, J.q. Xu, Jingkun Xu, J.-f. Yang, Baitao Zhang, H. J. ZhangAbstract:A passively Q-switched and mode-locked c-cut Nd:LuVO4 laser at 1.06 μm using Cr4+:YAG absorber has been successfully demonstrated. A nearly 100% modulation depth of mode-locking was achieved. At pump power of 12.04 W, the maximum average output power of 0.64 W and Q-switched pulse envelop repetition rate of 60 kHz were obtained with absorber's Initial Transmission of 96%, while the highest Q-switched pulse energy of 14.11 μJ was achieved with Initial Transmission of 60%. The duration of mode-locked pulse within Q-switched envelop was estimated to be 750 ps with 110 MHz repetition rate.
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Diode-pumped passively Q-switched and mode-locked Nd:YLF laser with Cr4+:YAG saturable absorber
Chinese Optics Letters, 2006Co-Authors: Hongmei Wang, Jingliang HeAbstract:A diode-pumped passively Q-switched Nd:YLF laser was demonstrated by using saturable absorber of Cr4+:YAG. At the incident power of 7.74 W, pure passively Q-switched laser with per pulse energy of 210 'mu'J and pulse width of 19.6 ns at repetition rate of 1.78 kHz was obtained by using Cr4+:YAG with Initial Transmission of 80%. At the incident power of 8.70 W, a Q-switched mode-locking with average output power of 650 mW was achieved, the overall slope efficiency was 16%, corresponding to the Initial Transmission of 85% of Cr4+:YAG.
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Diode-pumped passively Q-switched intracavity frequency doubled Nd:GdVO4/KTP green laser
Optics and Laser Technology, 2004Co-Authors: Jimin Yang, Jingliang HeAbstract:Abstract A compact diode-pumped passively Q-switched intracavity frequency-doubled Nd:GdVO4/KTP green-pulse laser was demonstrated, using Cr4+:YAG as a saturable absorber in a simple flat–flat cavity. With a 5.9 W incident pump power, a passively Q-switched green laser was obtained with an average power of 397 mW , repetition rate of 40 kHz , and pulse width of 40 ns , when the Initial Transmission of Cr4+:YAG was 85%. The shortest pulse width of 30 ns , the highest green peak power of 696 W and the maximum pulse energy of 21 μJ were obtained when the Initial Transmission of Cr4+:YAG was 70%. Under CW green operation, we obtained 440 mW output power.
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High repetition rate passively Q-switched diode-pumped Nd:YVO4 laser
Optics and Laser Technology, 2003Co-Authors: Jimin Yang, Jingliang HeAbstract:Abstract We demonstrated an efficient and compact, diode-pumped passively Q-switched Nd:YVO4 laser operation at 1.064 μm wavelength with high repetition rate, using Cr4+:YAG as saturable absorber, formed with a simple flat–flat resonator. The maximum CW output power of 4.05 W was obtained at the incident pump power of 8 W . For Q-switched operation, the maximum average output power was measured to be 1.4 W with the corresponding repetition rate of 200 kHz , the pulse width of 60 ns when the Initial Transmission of Cr4+:YAG crystal was 85%. The shortest pulse width of 12 ns , the largest pulse energy of 36 μJ and the highest peak power of 3 kW were obtained when the Cr4+:YAG crystal with an Initial Transmission of 60% was used.
David J. Binks - One of the best experts on this subject based on the ideXlab platform.
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Record performance from a passively Q-switched Yb : Er : YVO4 laser - art. no. 69980U
2020Co-Authors: Yuen Hong Tsang, C. J. Mercer, David J. Binks, Jonathan A. Terry, Thomas Graf, Helena Jelínková, Strasbourg UrbaineAbstract:Various lengths of Yb:Er:YVO4 were end pumped by a quasi-continuous wave 967 nm diode laser. The best slope efficiency with respect to absorbed Pump power for gain switched operation was 8 % for a 5 mm long crystal. Co:MgAl2O4 saturable absorbers of 98 % and 93 % Initial Transmission were used to passively Q-switch the cavity. For the 98 % Initial Transmission absorber, average pulses energies of 44 mu J were Measured. The average Pulse width and repetition rate were similar to 256 ns and 36 kHz, respectively. For the 93% Initial Transmission absorber, a single Output Pulse of 37 mu J energy and 22 ns duration per Pump pulse was measured when the crystal was pumped for a pumping duration of 1.7 ms.
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Record performance from a passively Q-switched Yb:Er:YVO4 laser
Solid State Lasers and Amplifiers III, 2008Co-Authors: Yuen Hong Tsang, C. J. Mercer, David J. BinksAbstract:Various lengths of Yb:Er:YVO4 were end pumped by a quasi-continuous wave 967 nm diode laser. The best slope efficiency with respect to absorbed pump power for gain switched operation was 8 % for a 5 mm long crystal. Co:MgAl 2 O 4 saturable absorbers of 98 % and 93 % Initial Transmission were used to passively Q-switch the cavity. For the 98 % Initial Transmission absorber, average pulses energies of 44 µJ were measured. The average pulse width and repetition rate were ~256 ns and 36 kHz, respectively. For the 93% Initial Transmission absorber, a single output pulse of 37 µJ energy and 22 ns duration per pump pulse was measured when the crystal was pumped for a pumping duration of 1.7 ms.
A. Shirakawa - One of the best experts on this subject based on the ideXlab platform.
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Passively Q-switched Yb:YAG/Cr:YAG ceramics miniature lasers with peak power ≫ 150 kW and nearly diffraction-limited beam quality
2007 European Conference on Lasers and Electro-Optics and the International Quantum Electronics Conference, 2007Co-Authors: J. Dong, A. Shirakawa, K. Ueda, H. Yagi, T. YanagitaniAbstract:Here we report on the high peak power laser performance of Yb:YAG/Cr:YAG all-ceramic miniature laser by using low Initial Transmission of the Cr4+:YAG and high Transmission of the output coupler.
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Sub-nanosecond passively Q-switched Yb:YAG/Cr^4+:YAG sandwiched microchip laser
Applied Physics B, 2006Co-Authors: J. Dong, A. Shirakawa, K.-i. UedaAbstract:We report on laser-diode pumped low-threshold, and compact passively Q-switched Yb:YAG microchip lasers, with Cr^4+:YAG crystals as the saturable absorbers. The laser threshold at the fundamental wavelength of 1.03 μm is as low as 0.25 W, and the slope efficiency is as high as 36.8%, and the optical-to-optical efficiency is as high as 27% for the 95% Initial Transmission of the Cr^4+:YAG crystal. A pulse width of 1.35 ns and peak power of over 8.2 kW was obtained. Using a 5 mm thick KTP crystal as the second-harmonic generation medium, 514.7 nm green light of 155 mW power was generated. The pulse duration of 480 ps was generated at 1.03 μm by using 85% of the Initial Transmission of the Cr^4+:YAG saturable absorber. Stable single-longitudinal-mode oscillation and wide-separated multi-longitudinal-mode oscillation due to the etalon effect of the Cr^4+:YAG thin plate was achieved at different pump power levels.