We developed a tunable-line-width 101 W average-power all-solid-state 589nm double spectral line sodium beacon laser. The laser was based on the technical route of 1064nm and 1319nm Nd:YAG laser extra cavity sum frequency generation. The laser contained two spectral lines: 589.1591 nm and 589.1571 nm. The former line was matched to the sodium D2a absorption line with the average power of 81W, while the other line was matched to the sodium D2b absorption line with the average power of 20W. The beam quality of the two spectral line lasers was both less than 1.3. The two lasers were polarized-combined to transmit coaxially. The initial line width of the laser was about 0.3GHz, which was in the comb-like discrete structure of about three longitudinal modes. We used a white noise generator to modulate the 1064nm single frequency seed laser in frequency domain. The line width’s tunability was accomplished by tuning the driving power of the white noise generator. The final line width tuning range of the 589nm laser was ~0.3GHz to ~1.1GHz.
Yanhua Lu, Lei Zhang, Xiafei Xu, Huaijin Ren, Bin Wei, Liao Yuan, Shenggang Gong, Tao Li, Jingliang Gu, Min Wan, and Guobin Fan, "Tunable line width all solid state double spectral line sodium beacon laser," Proc. SPIE 10436, High-Power Lasers: Technology and Systems, Platforms, and Effects, 1043605 (Presented at SPIE Security + Defence: September 13, 2017; Published: 26 October 2017); https://doi.org/10.1117/12.2278013.
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