Thermo-optic coefficients anisotropy was characterized in monoclinic potassium (rare-earth) double tungstates $\mathrm{KGd}({\mathrm{WO}}_4{)}_2$ and $\mathrm{KY}({\mathrm{WO}}_4{)}_2$ in the spectral range of 0.44–0.63 μm by a modified minimum deviation method. This approach takes into account the changes in the shape and dimensions of the prismatic sample caused by the anisotropic thermal expansion effect under uniform heating together with the conventional measurements of minimum deviation angle. At room temperature at the wavelength of 633 nm, principal refractive indices for KGdW are $n_p=2.0135$, $n_m=2.0458$, and $n_g=2.0860$, and for KYW they are $n_p=1.9979$, $n_m=2.0396$, and $n_g=2.0869$. Optical axes position for KGdW (KYW) crystals is $N_g\pm 42.60$ ($N_g\pm 44.1°$) in the $N_p-N_g$ plane. For both crystals, all the thermo-optic coefficients are negative and equal ${\mathrm{dn}}_p/dT=-10.6$, ${dn}_m/dT=-8.4$, and ${dn}_g/dT=-15.2$ for KGdW, and ${dn}_p/dT=-10.1$, ${dn}_m/dT=-7.3$, and ${dn}_g/dT=-8.4$ for KYW [${10}^{-6}{\mathrm{K}}^{-1}$] (at 633 nm).

© 2012 Optical Society of America

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Log in to access OSA Member Subscription

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Log in to access OSA Member Subscription

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Log in to access OSA Member Subscription

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Log in to access OSA Member Subscription

Related Journal Articles

• Phase-matching measurements and Sellmeier equations over the complete transparency range of KTiOAsO₄, RbTiOAsO₄, and CsTiOAsO₄ (JOSAB)
• Simple Recurrence Matrix Relations for Multilayer Anisotropic Thin Films (AO)
• Effective response functions for photonic bandgap materials (JOSAA)
• Reflection by uniaxial crystals: polarizing angle and Brewster angle (JOSAA)
• Dispersion and anisotropy of thermo-optic coefficients in tetragonal GdVO₄ and YVO₄ laser host crystals (AO)

Related Conference Papers

• Explicit Formulae for the Medium Parameters of Optically-Active Molecules and Crystals from the Microscopic Theory
• Explicit Formulae for the Medium Parameters of Optically-Active Molecules and Crystals from the Microscopic Theory
• Explicit Formulae for the Medium Parameters of Optically-Active Molecules and Crystals from the Microscopic Theory
• Experimental Comparison of Circular, Elliptical and Rectangular (Fishnet) Negative-Index Metamaterials
• Analytical Study of a 1-D Metalo-Dielectric Photonic Crystal