Thermo-optical properties of pure and Yb-doped monoclinic KY(WO4)2 crystals |
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| Authors: | P A Loiko K V Yumashev N V Kuleshov and A A Pavlyuk |
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| Institution: | (1) Ecole Nationale Sup?rieure de Physique de Grenoble (ENSPG), St-Martin d’H?res, 38402, France;(2) Department of Electrical Engineering and Computer Science, Laser-Aided Manufacturing, Materials and Micro-Processing Laboratory (LAMMMP), College of Optics and Photonics/CREOL, University of Central Florida, Orlando, FL 32816-2700, USA;(3) Department of Mechanical, Materials and Aerospace Engineering, College of Optics and Photonics, Center for Research and Education in Optics and Lasers (CREOL), University of Central Florida, Orlando, FL 32816-2700, USA; |
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| Abstract: | The thermo-optic coefficients, dn/dT, were determined for pure and Yb(20 at.%)-doped monoclinic KY(WO4)2 crystals for light polarized along the optical indicatrix axes (N
p,N
m and N
g) in the wavelength range of 0.36–1.06 μm by a laser beam deviation method. The absolute values of thermo-optic coefficients
satisfy the relation |dn
p/dT|>|dn
g/dT|>|dn
m/dT| and increase with the wavelength increasing. In the long-wavelength range, all the dn/dT values are negative: dn
p/dT=−14.6, dn
m/dT=−8.9, dn
g/dT=−12.4 10−6 K−1] for pure KY(WO4)2 at 1.06 μm. The dependency of thermo-optic coefficients on the wavelength was modeled using an approach that takes into account
contribution of volumetric thermal expansion and change of electronic bandgap with temperature. Large volumetric expansion
of KY(WO4)2 plays a key role in the observed negative dn/dT values. Electronic bandgap and its temperature coefficient were determined for KY(WO4)2 crystals from thermo-optic dispersion curves as E
g=4.8–5.0 eV and −dE
g/dT=0.7–1.1×10−4 eV/K. Athermal propagation directions were calculated for KY(WO4)2 crystals at the wavelength of 1.06 μm for light polarizations E∥N
m and N
p. |
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