为了获得结构简单、成本相对低廉的高功率780nm激光, 采用了单块倍频晶体的腔外倍频方法。分布式反馈半导体激光器产生的连续激光注入光纤放大器后, 通过周期极化铌酸锂晶体进行准相位匹配, 取得了铷原子的饱和吸收光谱。结果表明, 该激光器产生了1.2W的倍频光, 具有较高的输出功率。这一结果对铷原子钟、原子干涉仪等冷原子物理实验的小型化是有帮助的。

In order to obtain high power 780nm laser with simple structure and relatively low cost, the method of out-of-cavity frequency doubling with single frequency doubling crystal was adopted. After continuous wavelength laser generated by distributed feedback semiconductor lasers was injected into the optical fiber amplifier, quasi-phase matching was performed through periodically polarized lithium niobate crystals. The saturated absorption spectra of rubidium were obtained. The results show that, 1.2W frequency doubling light is produced and the laser has high output power. This result is helpful for the miniaturization of cold atomic physics experiments such as rubidium atomic clock and atomic interferometer.