Effect of Yb doping on the refractive index and thermo-optic coefficient of YVO4 single crystals

M Soharab; Indranil Bhaumik; R Bhatt; A Saxena; A K Karnal; P K Gupta

doi:10.1364/AO.56.001682

Effect of Yb doping on the refractive index and thermo-optic coefficient of YVO₄ single crystals

Appl Opt. 2017 Feb 20;56(6):1682-1688. doi: 10.1364/AO.56.001682.

Authors

M Soharab, Indranil Bhaumik, R Bhatt, A Saxena, A K Karnal, P K Gupta

PMID: 28234377
DOI: 10.1364/AO.56.001682

Abstract

Single crystals of YVO₄ with different doping concentrations of Yb (1.5, 3.0, 8.0, and 15.0 at. %) and with good crystalline quality (FWHM ∼43-55 arc sec of rocking curve) were grown by the optical floating zone technique. Refractive index measurements were carried out at four wavelengths as a function of temperature. The measurements show that as the doping concentration of Yb is increased, the refractive index varies marginally for n_e whereas there is a significant change in the value of n_o. The thermo-optic coefficient (dn/dT) was found to be positive with a value ∼10^-5/°C, which is 1 order higher than that for the undoped YVO₄ crystal. The thermo-optic coefficient is higher for n_e compared to that of n_o. Also, a set of relations describing the wavelength dependence of the thermo-optic coefficient were established that are useful for calculating the thermo-optic coefficient at any temperature in the range 30°C-150°C and at any wavelength in the range 532-1551 nm.