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详细介绍了基于1014.8nm室温光纤激光放大器的高效外腔倍频技术,获得了大功率的507.4nm单频激光。高效的外腔倍频是由内置正入射三硼酸锂晶体的高增益环形腔实现的,最高可以获得3 W的输出功率,倍频效率高达61.5%。倍频腔输入输出功率的实验测量值与理论计算结果相符合。该倍频腔针对4 W的基频光输入设计,在最佳工作点(4W)附近倍频效率对输入功率改变不敏感。在1.5h内,绿光输出功率涨落的均方根值为1.7%。大功率稳定输出的507.4nm单频激光可通过偏硼酸钡晶体倍频产生用于冷却中性汞原子所需的253.7nm深紫外激光,也可直接用于探测镱原子~1S_0态到~3P_2态跃迁的光谱和相关实验。
The efficient external cavity frequency doubling technology based on the 1014.8nm room temperature fiber laser amplifier is introduced in detail, and the high power 507.4nm single frequency laser is obtained. Efficient external cavity doubling is achieved by a high gain ring cavity with a built-in positive lithium triborate crystal that delivers up to 3 W of output power with 61.5% doubling efficiency. The experimental results of the input and output power of the double-frequency cavity are consistent with the theoretical results. Designed for a 4 W baseband optical input, this multiplier cavity is insensitive to input power changes near the optimum operating point (4W). Within 1.5h, the root mean square value of the green output power fluctuation is 1.7%. High-power and stable output of 507.4nm single-frequency laser can generate 253.7nm deep UV laser needed for cooling neutral mercury atoms by frequency doubling of barium metaborate, and can also be directly used to detect ytterbium atoms ~ 1S_0 state to ~ 3P_2 state Spectra of transitions and related experiments.