We describe an experiment that generates squeezed states by means of forward four-wave mixing in sodium vapor with a single optical beam. The single-beam arrangement maximizes the pump—probe spatial overlap in the nonlinear medium. Self-focusing (or self-defocusing) is found to be the major limiting factor in achieving optimal squeezing.
© 1991 Optical Society of America
S. T. Ho, N. C. Wong, and J. H. Shapiro, "Single-beam squeezed-state generation in sodium vapor and its self-focusing limitations," Opt. Lett. 16, 840-842 (1991)