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20 November 2008 The investigations of tunable, high peak power, diode pumped Tm:YLF laser
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Proceedings Volume 7141, 16th Polish-Slovak-Czech Optical Conference on Wave and Quantum Aspects of Contemporary Optics; 71410A (2008) https://doi.org/10.1117/12.822355
Event: 16th Polish-Slovak-Czech Optical Conference on Wave and Quantum Aspects of Contemporary Optics, 2008, Polanica Zdroj, Poland
Abstract
The numerical model of Q-switching regime for quasi-III-level laser including thermal effects was developed and verified with experiment. The room-temperature, high repetition rate, actively Q-switched Tm:YLF oscillator operating near 2-μm wavelength was constructed and examined. The 25-W fiber coupled laser diode with emission spectrum centered at 792-nm wavelength was deployed as a pump source. We have demonstrated in a short linear cavity above 5 W of output power for CW pumping and above 7 W for quasi-CW pumping regime (10 Hz repetition rate, 10 ms pump duration). The divergence angle was about 2.6 mrad, beam quality parameter M2 < 1.1 for higher pump level. Applying 2-plates Lyot's filter, the continuous tuning in the range of 1845-1935 nm was achieved. The linewidth of tunable spectrum was less than 0.7 nm for all pump power range. The acousto-optic modulator made of fused silica was deployed for Q-switching. For the quasi-CW regime of pumping, the maximum Q-switched energy was 10.5 mJ with pulse duration of 22 ns corresponding to near 450 kW of peak power. For CW pumping regime we also demonstrated above 10 mJ for the repetition rate of 133 Hz, however with longer, 46-ns pulse duration as a result of significant increase in temperature of crystal. The output energy and peak power were limited in Q-switching regime by damages of applied laser elements.
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Jan K. Jabczyński, Lukasz Gorajek, Waldemar Zendzian, Jacek Kwiatkowski, Helena Jelinkova, Jan Sulc, and Michal Nemec "The investigations of tunable, high peak power, diode pumped Tm:YLF laser", Proc. SPIE 7141, 16th Polish-Slovak-Czech Optical Conference on Wave and Quantum Aspects of Contemporary Optics, 71410A (20 November 2008); https://doi.org/10.1117/12.822355
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