Stimulated Raman scattering in helium with soft-x-ray laser radiation
- Max-Planck-Institut fuer Quantenoptik, D-85748 Garching, Germany Department of Physics, University of Southern California, Los Angeles, California 90089-084 Foundation for Research and Technology--Hellas, Institute of Electronic Structure and Laser, P.O. Box 1527, Heraklion 71110, Crete (Greece)
We report calculations for stimulated Raman scattering (SRS) with pump photons from a soft-x-ray laser. The Raman transitions from the 1{sup 1}{ital S}{sub 0} ground state to the 2{sup 1}{ital S}{sub 0} and 3{sup 1}{ital S}{sub 0} metastable states of helium at 20.6 and 22.9 eV, respectively, are considered. We calculate {chi}{sup (3)} for pump photons with an energy close to the autoionizing resonances (2{ital s}2{ital p}){sup 1}{ital P} at 60.15 eV and ({ital sp},23+){sup 1}{ital P} at 63.66 eV. SRS gain coefficients are derived for x-ray laser lines in close resonance with the autoionizing levels, viz., the 3{ital p}(3/2,3/2){sub 2}{r_arrow}3{ital s}(3/2,1/2){sub 1} transition in neonlike selenium ({lambda}=20.64 nm) and the analogous transition in neonlike bromine ({lambda}=19.47 nm). It is shown that the Raman gain coefficient with experimentally realistic parameters is significant and that a high gain length product can be achieved even with pump intensities below 10{sup 11} W/cm{sup 2}. {copyright} {ital 1996 The American Physical Society.}
- OSTI ID:
- 397556
- Journal Information:
- Physical Review A, Journal Name: Physical Review A Journal Issue: 6 Vol. 54; ISSN 1050-2947; ISSN PLRAAN
- Country of Publication:
- United States
- Language:
- English
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