We present a cylindrical rod of single-crystal Nd:YAG fabricated from a bulk crystal using femtosecond laser-induced preferential etching. The rod is pumped at 808 nm, and the laser characteristics at 1064 nm emission and the thermal stability are investigated. The slope efficiency was determined with a maximum optical-to-optical efficiency of 7.9%±0.29% and a FWHM linewidth of 299 ± 63 pm. The etched rod shows parameters consistent with existing Nd:YAG gain crystals. This fabrication technology will find use in composite micro-optical devices where microfluidics, active and passive optics, and structures can be etched out of many different materials and combined into a single device.

中文翻译：

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飞秒激光诱导化学刻蚀Nd:YAG激光棒

我们提出了使用飞秒激光诱导的优先蚀刻由块状晶体制成的单晶 Nd:YAG 圆柱棒。棒在 808 nm 处被泵浦，并研究了 1064 nm 发射处的激光特性和热稳定性。斜率效率由最大光对光效率 7.9%±0.29% 和 FWHM 线宽 299±63 pm 确定。蚀刻棒显示出与现有 Nd:YAG 增益晶体一致的参数。这种制造技术将用于复合微光学器件，其中微流体、有源和无源光学器件以及结构可以从许多不同的材料中蚀刻出来并组合成单个器件。