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17 February 2010 Cr-ZnSe passively Q-switched fiber-bulk Ho:YAG hybrid laser
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Abstract
The objective of this work was to develop a compact and efficient Tm-fiber-Ho:YAG, hybrid laser passively Q-switched by Cr:ZnSe saturable absorber. We used a folded semi-hemispherical 10 cm long cavity with a plane output coupler and a 0.5 m concave high reflector. In these experiments we studied the performance of two high optical quality Cr:ZnSe crystals as saturable absorbers with initial transmissions of 93.9% and 70% at 2.1 μm. With the 93.9% transmission crystal, passive Q-switching was realized with a maximum output power of 5 W, pulse energy of 0.5 mJ, pulse duration of 150 ns, and Q-switched-to-CW-mode extraction efficiency of 60%. With the 70% transmission crystal, passive Qswitching was achieved with a 75% Q-switched-to-CW-mode extraction efficiency, pulse energy of 3 mJ, and duration of 7ns. The laser demonstrated sustained damage-free, TEM000 operation with 0.5 MW of peak power showing promise for applications requiring high-peak-power, diffraction-limited beams, and single-frequency regimes of operation.
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Yuri Terekhov, Igor S. Moskalev, Dmitri V. Martyshkin, Vladimir V. Fedorov, and Sergey B. Mirov "Cr-ZnSe passively Q-switched fiber-bulk Ho:YAG hybrid laser", Proc. SPIE 7578, Solid State Lasers XIX: Technology and Devices, 75781J (17 February 2010); https://doi.org/10.1117/12.842597
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