We have investigated the effects of Stokes and anti-Stokes pulse injection on high-order anti-Stokes Raman scattering for efficient generation of vacuum-ultraviolet radiation. The output energies as well as the spatial profiles of anti-Stokes pulses were much improved by injection. Enhancement factors increased for higher orders of anti-Stokes pulses. The shift of optimum pressure together with the change of profile from a ring to a Gaussian-like shape induced by injection indicates that the enhancement is due to the modification of phase-matching geometry in four-wave Raman mixing for anti-Stokes generation.

© 1995 Optical Society of America

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