Thermo-optic and thermal expansion coefficients of RTP and KTP crystals over 300-350 K

Abstract

We report new measurements of the thermal expansion and thermo-optic coefficients of RbTiOPO${}_4$ (RTP) and KTiOPO${}_4$ (KTP) crystals over the temperature range 300-350 K. For RTP/KTP our coefficients of linear thermal expansion at 305 K are: ${\alpha }_x=9.44/7.88\times 10^{-6}$/K, ${\alpha }_y=12.49/9.48\times 10^{-6}$/K, ${\alpha }_z=-4.16/0.02\times 10^{-6}$/K. Our normalized thermo-optic coefficients $\beta =(1/n)dn/dT$ at 632.8 nm and 305 K are: ${\beta }_x=5.39/3.78\times 10^{-6}$/K, ${\beta }_y=7.11/5.24\times 10^{-6}$/K, ${\beta }_z=12.35/9.34\times 10^{-6}$/K.

12 pages, 5 figures, 9 tables