$({>}{rm MW})$, passively Q-switched Yb:YAG/Cr:YAG micro-laser end-pumped by fiber-coupled 120-W QCW LDs High Peak Power, Passively Q-Switched Yb:YAG/Cr:YAG Micro-Lasers
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High Peak Power, Passively Q-Switched Yb:YAG/Cr:YAG Micro-Lasers

机译：高峰值功率，无源调Q Yb：YAG / Cr：YAG微激光

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摘要

A high peak power $({>}{rm MW})$, passively Q-switched Yb:YAG/Cr:YAG micro-laser end-pumped by fiber-coupled 120-W QCW LDs $({rm Repetition~rate}<{100}~{rm Hz})$ is developed. The convex output coupler with a curvature of ${-}{rm 2}~{rm m}$ successfully enlarges the fundamental mode size in the micro-laser cavity, and the output pulse energy increases to 3.6 mJ at a Cr:YAG initial transmission of 89% without optical damage. The ${rm TEM}_{00}$ transverse mode and the single-frequency oscillation are confirmed. The pulse duration is 1.3 ns, and then the peak power is estimated as 2.8 MW. To our knowledge, these are the highest pulse energy and peak power ever reported in Yb:YAG/Cr:YAG micro-lasers. The Yb:YAG rod with 5 at.% Yb concentration and 4.2-mm thickness keeps more than 80% single-pass pump absorption ranging from 15$^{circ}{rm C}$ to 45 $^{circ}{rm C}$ in LD temperature. On the other hand, the characteristic temperatures of Yb:YAG/Cr:YAG and Nd:YAG/Cr:YAG lasers were estimated as 110 and 278 K, respectively. This means that the ratio of the increase in threshold pump energy to temperature of a Yb:YAG/Cr:YAG laser is twice or higher than that of a Nd:YAG/Cr:YAG laser due to a quasi-3-level system of Yb:YAG.
机译：高峰值功率 $（{>} {rm MW}）$ ，被动调Q的Yb：YAG / Cr： YAG微激光器由光纤耦合的120W QCW LD泵浦<公式式==“ inline”> $（{rm Repetition〜rate} <{100}〜{rm Hz}） $ 已开发。曲率 $ {-} {rm 2}〜{rm m} $ 的凸输出耦合器成功地扩大了基数Cr：YAG初始传输率达89％时，微激光腔中的激光脉冲尺寸达到最大，输出脉冲能量增加至3.6 mJ，而不会造成光学损伤。确认了<公式公式类型=“ inline”> $ {rm TEM} _ {00} $ 横向模式和单频振荡。脉冲持续时间为1.3 ns，然后峰值功率估计为2.8 MW。据我们所知，这是Yb：YAG / Cr：YAG微激光器中报告的最高脉冲能量和峰值功率。 Yb：YAG棒的Yb浓度为5 at。％，厚度为4.2 mm，保持单次泵浦吸收率超过80％，范围为15 <公式> $ ^ {circ } {rm C} $ 转换为45 $ ^ {circ} {rm C} $ 在LD温度。另一方面，Yb：YAG / Cr：YAG和Nd：YAG / Cr：YAG激光器的特征温度分别估计为110 K和278K。这意味着，由于准三能级系统的存在，Yb：YAG / Cr：YAG激光器的阈值泵浦能量增加与温度的比率是Nd：YAG / Cr：YAG激光器的两倍或更高。 Yb：YAG。

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