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Optical absorption and stimulated emission of neodymium in yttrium orthosilicate

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5 Author(s)
Beach, R. ; Lawrence Livermore Nat. Lab., CA, USA ; Shinn, M.D. ; Davis, L. ; Solarz, R.W.
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A spectroscopic investigation of the biaxial crystal yttrium orthosilicate doped with Nd3+(Nd3+:Y2SiO5) has been performed. Spectrally and orientationally resolved emission cross sections necessary for the evaluation of laser performance on the Nd3+ 4F3/2-4I 9/2 and 4F3/2-4I11/2 transitions have been determined. The Judd-Ofelt theory has been applied to measured values of optical absorption line strengths to obtain the orientation averaged intensity parameters: Ω2-3.34×10-20 cm2, Ω 4=4.35×10-20 cm2, and Ω6=5.60×10-20 cm2. These Judd-Ofelt intensity parameter values are significantly different from those previously reported by A.M. Tkachuk et al. Using these intensity parameters, the Nd3+ 4F2 metastable state lifetime is predicted to be 225 μs. Measured low Nd concentration 4F3/2 lifetimes of 214 μs indicate a high radiative quantum efficiency. Because of the Stark level splitting of the Nd3+ 4F3/2 and 4I9/2 manifolds, laser operation at twice one of the Cs atomic resonance filter acceptance wavelengths is possible

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Quantum Electronics, IEEE Journal of  (Volume:26 ,  Issue: 8 )