Open AccessThermo-optic characterization of Yb:CaGdAlO_4 laser crystal
Author(s) -
Pavel Loiko,
Frédéric Druon,
Patrick Georges,
Bruno Viana,
K. V. Yumashev
Publication year - 2014
Publication title -
optical materials express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.925
H-Index - 66
ISSN - 2159-3930
DOI - 10.1364/ome.4.002241
Subject(s) - materials science , crystal (programming language) , optics , laser , thermal conductivity , dispersion (optics) , wavelength , diode , optical path , optoelectronics , characterization (materials science) , physics , computer science , programming language , nanotechnology , composite material
International audiencePrincipal thermo-optic coefficients (TOCs), dn o /dT and dn e /dT, are measured for Yb:CaGdAlO 4 crystal, for the first time, to our knowledge. At the wavelength of ~1 μm, they equal –7.6 and –8.6 (× 10 −6 K −1), accordingly. Thermal coefficients of the optical path (TCOP) are determined for this crystal for the principal crystal cuts (a-cut and c-cut) and light polarizations (π or σ). Thermo-optic dispersion formulas are evaluated for both TOC and TCOP coefficients. Optical power of thermal lens is measured for diode-pumped a-cut Yb:CaGdAlO 4 ; it is also calculated on the basis of measured material parameters. Thermal conductivity of CaGdAlO 4 crystal is measured versus Yb concentration. The results indicate that a-cut Yb:CaGdAlO 4 can provide really " athermal " behavior
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