12 May 2006 High-power single- and double-frequency, tunable mini-laser with nano-film selector for onboard applications
Igor Peshko,	Vladimir Rubtsov,	Jan Jabczynski,	Krzysztof Kopczynski
Igor Peshko,1 Vladimir Rubtsov,2 Jan Jabczynski,3 Krzysztof Kopczynski3
1Univ. of Toronto (Canada)
2Intelligent Optical Systems, Inc. (United States)
3Military Univ. of Technology (Poland)
Proceedings Volume 6243, Enabling Photonics Technologies for Defense, Security, and Aerospace Applications II; 62430S (2006) https://doi.org/10.1117/12.663830
Event: Defense and Security Symposium, 2006, Orlando (Kissimmee), Florida, United States
A new architecture of single-frequency high efficiency mini-solid-state lasers is proposed. The application of a metallic nano-film selector has been investigated theoretically and experimentally. It has been shown that a cobalt thinfilm selector with a thickness between 8 and 10 nm provides a single- frequency output within a power range of up to 0.6 W with a 1-mm thick Nd:YVO4 gain crystal. At single-mode operation, it accumulated 85% of the multimode laser output. Slope efficiencies of single-frequency oscillation from 41% to 53% have been demonstrated for different crystals. The output coupler movement by piezoceramic transducer provided single-frequency operation, with slow smooth tuning, or chirping. The laser, with a cavity length less than 1", provided smooth tuning up to 10 GHz, frequency chirping up to 4 GHz with a repetition rate of about 0.5 kHz, and hop tuning over 150 GHz at a maximum pump power of 1.8 W. Double-frequency operation with a separation of 1.5 to 2.5 GHz was realized in a laser with a cavity length up to 100 mm. Physical and technical limitations caused by the wide-gain bandwidth, thermal effects, and mechanical vibrations of the cavity elements are discussed. The new specific regime of frequency self-stabilization provided with a thin-film metallic selector has been proposed. Slow, periodical self-modulation phenomena in the diode-pumped singlefrequency Nd:YVO4 laser with a cobalt thin-film selector have been demonstrated. Pulses with duration of about l to 3s and periods of about 3 to 10 s have been observed.
Igor Peshko, Vladimir Rubtsov, Jan Jabczynski, and Krzysztof Kopczynski "High-power single- and double-frequency, tunable mini-laser with nano-film selector for onboard applications", Proc. SPIE 6243, Enabling Photonics Technologies for Defense, Security, and Aerospace Applications II, 62430S (12 May 2006); https://doi.org/10.1117/12.663830
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Igor Peshko, Vladimir Rubtsov, Jan Jabczynski, Krzysztof Kopczynski, "High-power single- and double-frequency, tunable mini-laser with nano-film selector for onboard applications," Proc. SPIE 6243, Enabling Photonics Technologies for Defense, Security, and Aerospace Applications II, 62430S (12 May 2006); https://doi.org/10.1117/12.663830