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Two-photon-absorption cross section of Nd/sup 3+/ in yttrium aluminum garnet and yttrium lithium fluoride near 1. 06. mu. m

Journal Article · · Phys. Rev. B: Condens. Matter; (United States)
We have measured the spectrally integrated two-photon-absorption (TPA) cross sections for the /sup 4/I/sub 9/2/..-->.. /sup 4/G/sub 7/2/ transitions of Nd/sup 3+/ and obtained values of 1.2 x 10/sup -40/ and 0.15 x 10/sup -40/ cm/sup 4/ for Nd/sup 3+/-doped yttrium aluminum garnet (YAG) and yttrium lithium fluoride (YLF), respectively. These results are in satisfactory agreement with theoretical calculations based on the properties of Nd/sup 3+/ free-ion wave functions. The difference between YAG and YLF, however, is not accounted for by the free-ion theory and suggests that the intermediate-state energies and wave functions are considerably host dependent. In addition, we conclude, based on our measurements, that rare-earth TPA will not contribute significantly to either losses or the nonlinear refractive index in typical laser media employing rare-earth ions.
Research Organization:
Lawrence Livermore National Laboratory, University of California, P.O. Box 5508, Livermore, California 94550
DOE Contract Number:
W-7405-ENG-48
OSTI ID:
6727419
Journal Information:
Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 34:12; ISSN PRBMD
Country of Publication:
United States
Language:
English