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12 May 2006 High-power single- and double-frequency, tunable mini-laser with nano-film selector for onboard applications
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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.
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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);

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