Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9786089 | Optics Communications | 2005 | 13 Pages |
Abstract
Resonance-enhanced four-wave mixing and generation of sum-frequency field in xenon have been studied under two-color excitation by spatially coherent and incoherent conical laser beams. Comparisons of analogous results with the two-color excitation in ordinary geometry of focussed beams and in one-color Bessel beams are made. It has been shown that with incoherent laser beams the four-wave mixing process is much less degraded in conical excitation geometry where an efficient generation of sum-frequency field can be obtained despite of multiple wave-front aberrations. Such a tolerance of conical beams results from their specific structure of coherent focal domains which are extended significantly along the beam axis. In two-color conical beams the four-wave mixing process is driven within the central lobe of the coherent Bessel beam, where a few of long coherent domains from the incoherent beam are embedded. It preserves a relatively high degree of coherence for excitation processes. Numerical simulation of sum-frequency excitation profiles for one- and two-color conical beams has been carried out and good agreement with experimental observations has been obtained.
Related Topics
Physical Sciences and Engineering
Materials Science
Electronic, Optical and Magnetic Materials
Authors
V. Peet, S. Shchemeljov,