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Third-order nonlinearity and passive Q-switching of Cr4+:YGG garnet crystal

机译：Cr4 +：YGG石榴石晶体的三阶非线性和无源Q开关

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摘要

We demonstrate the third-order nonlinear optical properties of Cr4+:Y3Ga5O12 ( Cr4+:YGG) and Q-switched lasers with Cr4+:YGG as the saturable absorber for the first time to our knowledge. The third-order nonlinear properties, including the optical Kerr nonlinearity and saturable absorption, were systematically measured and analyzed in detail by using a Z-scan technique. The measured data show that Cr4+:YGG has a large nonlinear refractive index, ground-state absorption cross section, and excited-state absorption cross section in contrast to Cr4+:Y3Al5O12 ( Cr4+:YAG). With a Nd:YGG crystal as the gain medium and a Cr4+:YGG crystal as the saturable absorber, the passively Q-switched laser was performed. The shortest pulse width and largest pulse energy were achieved at the absorbed pump power of 8 W with the values of 9.1 ns and 26.1 mu J, respectively, corresponding to the average output power of 0.87 W and peak power of 2.9 kW. The results indicate that Cr4+:YGG is an available and promising optical switcher for pulsed lasers. (C) 2015 Optical Society of America
机译：我们首次了解到了Cr4 +：Y3Ga5O12（Cr4 +：YGG）和以Cr4 +：YGG作为可饱和吸收剂的Q开关激光器的三阶非线性光学特性。通过使用Z扫描技术，系统地测量和分析了三阶非线性特性，包括光学Kerr非线性和饱和吸收。测量数据表明，与Cr4 +：Y3Al5O12（Cr4 +：YAG）相比，Cr4 +：YGG具有较大的非线性折射率，基态吸收截面和激发态吸收截面。以Nd：YGG晶体为增益介质，并以Cr4 +：YGG晶体为饱和吸收体，进行了被动调Q激光器。在8 W的吸收泵浦功率下，获得了最短的脉冲宽度和最大的脉冲能量，其值分别为9.1 ns和26.1μJ，分别对应于平均输出功率0.87 W和峰值功率2.9 kW。结果表明，Cr4 +：YGG是一种可用且有前途的脉冲激光光学切换器。 （C）2015年美国眼镜学会

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