Wu Zhengnan, Lu Yuangang, Huang Jian, Peng Jianqin, He Chongjun
Appl Opt. 2022 Jan 10;61(2):392-397. doi: 10.1364/AO.445128.
In this paper, we investigate the third-order nonlinearities and optical limiting effect of Tm: YAG crystal at a wavelength of 1064 nm. We experimentally measure different energy densities (6.4, 12.8, and 19.2/) and obtain the nonlinear absorption coefficient, nonlinear refractive index, and third-order nonlinear susceptibility of Tm: YAG crystal. Z-scan results show that Tm: YAG crystal exhibits a large nonlinear absorption coefficient (3.34×10/) at the wavelength of 1064 nm. We also measure the transmittance of Tm: YAG crystals of three different lengths (7, 15, and 20 mm) to evaluate its nonlinear optical limiting performance. For the 20 mm Tm: YAG crystal, the maximum transmittance without optical limiting effect and minimum transmittance with nonlinear optical limiting effect at a 1064 wavelength nm are 84.2% and 47.8%, respectively, which indicates that Tm: YAG crystal may be a solid material for nonlinear optical limiting at 1064 nm.
在本文中，我们研究了掺铥钇铝石榴石（Tm:YAG）晶体在1064 nm波长下的三阶非线性特性和光学限幅效应。我们通过实验测量了不同的能量密度（6.4、12.8和19.2/），并获得了Tm:YAG晶体的非线性吸收系数、非线性折射率和三阶非线性极化率。Z扫描结果表明，Tm:YAG晶体在1064 nm波长处呈现出较大的非线性吸收系数（3.34×10/）。我们还测量了三种不同长度（7、15和20 mm）的Tm:YAG晶体的透过率，以评估其非线性光学限幅性能。对于20 mm的Tm:YAG晶体，在1064 nm波长下，无光学限幅效应时的最大透过率和有非线性光学限幅效应时的最小透过率分别为84.2%和47.8%，这表明Tm:YAG晶体可能是一种用于1064 nm非线性光学限幅的固体材料。
