Application of Judd–Ofelt Theory in Analyzing Dy: SrCaF4 Single Crystal

The optical properties of Dy:SrCaF4 crystal in the visible range are investigated. Judd-Ofelt intensity parameters are evaluated following the assignment of Stark levels of absorption bands. The absorption coefficient and absorption cross section are reported, together with the line strengths of several transitions from the ground state to excited state manifold, oscillator strength of the electric and magnetic dipoles moments (fed, fmd). The emission wavelength (lambda em), calculated fluorescence branching ratios (beta R), radiative emission probabilities (AR), total radiative emission probability (Ar) and radiative lifetime (tau R) of Dy3+ in CaSrF4 crystal are investigated for the transitions from energy levels 4 F9/2 (474 nm), 4 I15/2 (452 nm), 6 P5/2 (364 nm) and 6 P7/2 (348 nm) to related sublevels. Dy:CaSrF4 crystal is a promising gain medium for a continuous wave or tunable solid state visible micro-laser under the pump wavelength of 348 nm, 364 nm and 474 nm.