Dispersion and anisotropy of thermo-optical properties of Alexandrite laser crystal
Dispersion and anisotropy of thermo-optical properties of Alexandrite laser crystal
复制标题
紫翠玉激光晶体热光特性的色散和各向异性
作者：
P. Loiko;S. Ghanbari;V. Matrosov;K. Yumashev;A. Major
研究了三种主要光偏振 E || 紫翠玉激光晶体 (Cr3+:BeAl2O4) 的光路热系数 (TCOP) 和热光系数 (TOC) 的色散和各向异性。一个，E || b 和 E || c.给出了 0.4-1.1 µm 光谱范围的热光色散公式。所有 TOC 均为正值，并在 0.75 µm 处表现出显着的偏振各向异性，dna/dT = 5.9、dnb/dT = 6.9 和 dnc/dT = 15.2 × 10−6 K−1。热透镜效应在连续波紫翠玉激光器中进行了表征，该激光器以 0.532 µm 泵浦并在 0.7509 µm 下工作（对于 E || b）。测得的热透镜是弱的、正的、轻微散光的。热透镜的灵敏度系数为 Mx = 1.74 和 My = 2.38 [m−1/W]。
Dispersion and anisotropy of thermal coefficients of the optical path (TCOP) and thermo-optic coefficients (TOCs) of Alexandrite laser crystal (Cr3+:BeAl2O4) are studied for the three principal light polarizations, E || a, E || b and E || c. Thermo-optic dispersion formulas are presented for the spectral range of 0.4-1.1 µm. All TOCs are positive and show a notable polarization-anisotropy, dna/dT = 5.9, dnb/dT = 6.9 and dnc/dT = 15.2 × 10−6 K−1 at 0.75 µm. Thermal lensing was characterized in a continuous-wave Alexandrite laser pumped at 0.532 µm and operating at 0.7509 µm (for E || b). The measured thermal lens was weak, positive and slightly astigmatic. The sensitivity factors of the thermal lens were found to be Mx = 1.74 and My = 2.38 [m−1/W].