Alexandrite is a well-known material for broadly tunable and power-scalable near-IR lasers. We measured the thermal coefficients of the optical path (TCOP) and thermo-optic coefficients (TOCs) of Alexandrite at 632.8 nm for three principal light polarizations, E || a, E || b and E || c. All TOCs are positive and show a notable polarization-anisotropy, dna/dT = 5.5, dnb/dT = 7.0 and dnc/dT = 14.9×10-6 K-1. We also characterized thermal lensing in a continuous-wave Alexandrite laser which used a Brewster-oriented c-cut 0.16 at.% Cr3+ doped BeAl2O4 crystal pumped at 532 nm and emitted at 750.9 nm (E || b). The measured thermal lens was positive and astigmatic. The sensitivity factors of the thermal lens (Mx,y = dDx,y/dPabs) were found to be Mx = 1.74 and My = 2.38 [m-1/W].
Pavel Loiko, Shirin Ghanbari, Vladimir Matrosov, Konstantin Yumashev, and Arkady Major, "Thermo-optical properties of Alexandrite laser crystal," Proc. SPIE 10511, Solid State Lasers XXVII: Technology and Devices, 105111U (Presented at SPIE LASE: February 01, 2018; Published: 15 February 2018); https://doi.org/10.1117/12.2289071.
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