We use a frequency-shifted feedback technique with a high-gain fiber amplifier operating at
© 2000 Optical Society of America
(060.2320) Fiber optics and optical communications : Fiber optics amplifiers and oscillators
(140.0140) Lasers and laser optics : Lasers and laser optics
(140.5560) Lasers and laser optics : Pumping
(170.3880) Medical optics and biotechnology : Medical and biological imaging
(190.2640) Nonlinear optics : Stimulated scattering, modulation, etc.
M. Cashen, V. Bretin, and H. Metcalf, "Optical pumping in 4He with frequency-shifted feedback amplification of light," J. Opt. Soc. Am. B 17, 530-533 (2000)