Growth and spectroscopic properties of Tm3+ doped YPO4 crystal

Abstract

A good quality single crystal of Tm³⁺ doped YPO₄ crystal was grown utilizing the flux method using a lead or molybdenum free flux. The spectroscopic properties of the crystal were investigated. The absorption cross-section of Tm³⁺:YPO₄ at 791 nm is as large as 3.09 × 10⁻²⁰ cm². The intensity parameters Ω_2,4,6, radiative transition rates, branching ratios and radiative lifetime were calculated by using the Judd–Ofelt theory. The strong experimental emission cross-section has an astounding value of 6.71 × 10⁻²⁰ cm² and is located at 1802 nm. All the results indicate that the Tm³⁺:YPO₄ crystal is a potential laser medium crystal.