Abstract

Brillouin amplification is a form of two-beam coupling in which a signal beam is amplified by stimulated Brillouin scattering from a counterpropagating pump beam (Fig, 1). The two beams interact via an acoustic grating which is generated within the Brillouin medium. The beams have a frequency difference dose to the acoustic frequency, with the signal having a lower frequency than the pump, i.e., ω_λ=ω_γ−ω_δ−δω_f, where ω_δ, is the acoustic frequency, and δω is a detuning from the center of the Brillouin gain curve.

© 1992 Optical Society of America