Intra-cavity frequency doubling of continuous-wave (CW) laser emission on the quasi-three level (4F3/2 → 4I9/2) laser transition of Nd3+ in Nd:GGG is reported by using a three-mirror folded resonator. The thermal lens experienced by the optically-pumped Nd:GGG laser crystal is measured as a function of the absorbed pump power and compared to that found, in the same conditions, in the case of Nd:YAG. Results are interpreted by using a simple model accounting for the absorbed pump power and the thermo-mechanical properties of each laser crystal. Diode-pumped blue laser operation is achieved, for the first time, at 467.0 and 468.5 nm with output powers of 230 and 450 mW, respectively. Simultaneous laser operation resulting both from frequency-doubling and frequency summing at the three 467.1, 467.7, and 468.1 nm laser wavelengths is also obtained with a total output power of 60 mW.

中文翻译：

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Nd:GGG 在 467.0、467.7 和 468.5 nm 的二极管泵浦连续波蓝色激光操作

通过使用三镜折叠谐振器报道了 Nd:GGG 中 Nd3+ 准三能级 (4F3/2 → 4I9/2) 激光跃迁的连续波 (CW) 激光发射的腔内倍频。光学泵浦 Nd:GGG 激光晶体所经历的热透镜被测量为吸收泵浦功率的函数，并与在相同条件下在 Nd:YAG 的情况下发现的结果进行比较。通过使用一个简单的模型来解释结果，该模型考虑了每个激光晶体的吸收泵浦功率和热机械特性。首次实现了二极管泵浦蓝色激光操作，波长分别为 467.0 和 468.5 nm，输出功率分别为 230 和 450 mW。由三个 467.1、467.7 和 468 处的倍频和频率求和产生的同时激光操作。