Thermo-optic properties of Yb:Lu2O3 single crystals
Abstract
A detailed study of thermo-optic properties of 1.5 at.% Yb:Lu2O3 single crystal is performed. Thermo-optic dispersion formulas are derived for d n/d T coefficient and thermal coefficient of the optical path. At the wavelength of 1.03 μm, d n/d T = 5.8 × 10-6 K-1. High-precision temperature-dependent measurements of the thermal expansion coefficient α are performed. At the room temperature (RT), α = 5.880 ± 0.014 × 10-6 K-1. Temperature dependence of the bandgap is analyzed, yielding RT value of E g = 5.15 eV and d E g/d T = -3.7 × 10-4 eV/K. Sensitivity factor of the thermal lens is calculated for a diode-pumped Yb:Lu2O3 crystal versus the pump spot radius and crystal temperature.
- Publication:
-
Applied Physics B: Lasers and Optics
- Pub Date:
- September 2015
- DOI:
- 10.1007/s00340-015-6171-4
- Bibcode:
- 2015ApPhB.120..601L