Thermal and optical properties of Tm3+:SrMoO4 crystal

Single crystal Tm3+:SrMoO4 was grown successfully by Czochralski technique along the (0 0 1) orientation in N2 atmosphere. The refractive index of SrMoO4 crystal was measured at room temperature. The linear thermal expansion coefficients along c- and a-axes were measured to be 1.70 × 10−5 °C−1 and 0.59 × 10−5 °C−1, respectively. Its polarized absorption spectra, fluorescence spectra and fluorescence decay curve have also been investigated at room temperature. Based on the Judd–Ofelt theory, the intensity parameters have been determined as: Ω2 = 7.875 × 10−20, Ω4 = 2.797 × 10−20 and Ω6 = 0.92 × 10−20 cm2. The radiative probabilities, radiative branching ratios, radiative lifetimes and stimulated emission cross sections of Tm3+ in SrMoO4 were obtained. The quantum efficiency of the 3H4 level is determined to be approximately 88.56% for this material.