Abstract
A spectroscopic investigation of Nd3+ in calcium fluoride host is performed to assess its feasibility for laser action. The Judd-Ofeit theory is applied to measured values of absorption line strengths to obtain the intensity parameters: Ω2 = 0.87 × 10−20 cm2, Ω4 = 3.44 × 10−20 cm2, and Ω6 = 9.47 × 10−20 cm2. These intensity parameters are used to calculate the line strengths for excited-state emission from the metastable 4F3/2 state to the 4IJ′ manifolds. The calculated line strengths are then used to predict the radiative decay rates and branching ratios. The radiative lifetime of the metastable state is predicted to be 190 μs. Finally, the important working parameter X = Ω4/Ω6, known as spectroscopic quality factor, for this sample is calculated and compared with those of other Nd3+ -based laser crystals.
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