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Growth, optical properties, and CW laser action of neodymium-doped gadolinium scandium aluminum garnet

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2 Author(s)
C. Brandle ; Bell Laboratories, Murray Hill, NJ ; J. Vanderleeden

Investigation of the congruent melting rare-earth aluminum garnet Gd3Sc2Al3O12(GADSCAG) has been made. The optimum crystal growth parameters for the undoped material are a rotation rate of 20 r/min and a growth rate of 4.6 mm/hr along the \langle 111\rangle direction. For Nd3+-doped crystals the linear growth rate is 2 mm/h. The optical properties of Nd:GADSCAG which are of interest for laser operation were also determined. The stimulated emission cross section of the 1.06-μ transition in Nd3+at room temperature is (3.2 \pm 0.3) \times 10^{-19} cm2, the fluorescence lifetime is 256 \pm 8 \mu s at an Nd3+ion density of 1 atomic percent in the crystal and the integrated peak absorption cross section in the strongest pump band (0.81 μ) is 3.8 \times 10^{-19} cm2, A comparison of the CW laser performance of identical ND:YAG and Nd:GADSCAG rods is presented.

Published in:

IEEE Journal of Quantum Electronics  (Volume:10 ,  Issue: 1 )