研制出一台全固态低噪声连续单频Nd∶YVO₄-LBO双波长激光器,通过优化三硼酸锂(LBO)的匹配温度,获得了波长为1.06 μm的激光功率为3.8 W、波长为532 nm的激光功率为7.8 W的连续单频双波长激光输出,并有效降低双波长激光的强度噪声和相位噪声。实测的1.06 μm和532 nm波长激光的强度噪声均在分析频率大于3.5 MHz时达到散粒噪声极限,相位噪声均在分析频率大于5 MHz时达到散粒噪声极限。当采用Pound-Drever-Hall锁腔技术锁定激光器的腔长时,1.06 μm波长激光在1 h内的频率漂移小于±0.8 MHz。实测的1.06 μm和532 nm波长激光在5 h内的功率波动分别小于±0.63%和±0.47%,光束质量因子分别为1.04和1.12。

A kind of all-solid-state Nd∶YVO4-LBO dual-wavelength laser with low noise and continuous wave (CW) single frequency is developed. By optimizing the matching temperature of LBO crystals, a CW single-frequency dual-wavelength laser with 1.06 μm output power of 3.8 W and 532 nm output power of 7.8 W is realized. The intensity and phase noises of this dual-wavelength laser are also reduced. The measured intensity noises of the 1.06 μm and 532 nm lasers reach the shot noise limit (SNL) when the analysis frequency is above 3.5 MHz, and the measured phase noises reach the SNL when the analysis frequency is above 5 MHz. When the Pound-Drever-Hall cavity-locking technique is used for the stabilization of laser cavity length, the frequency drift of 1.06 μm laser is less than ±0.8 MHz. The measured power fluctuations of the 1.06 μm and 532 nm lasers within 5 hours are less than ±0.63% and ±0.47%, and the beam quality factors are 1.04 and 1.12, respectively.