What is to our knowledge the first stimulated Brillouin scattering experiment using a high-power low-gain solar pumped laser is presented. A threshold reflectivity of 0.23% was reached when a peak power of 20.7 kW was used at 7.6 GHz. A cw solar pumped laser was <i>Q</i>-switched with an acousto-optic modulator, and the bandwidth was narrowed with an intracavity etalon. A high polarization ratio (>99.4%) was achieved by use of an intracavity configuration. Higher reflectivity values were limited because of the lack of availability of optical switches.
© 2002 Optical Society of America
(070.5040) Fourier optics and signal processing : Phase conjugation
(140.3580) Lasers and laser optics : Lasers, solid-state
(140.6810) Lasers and laser optics : Thermal effects
(260.1440) Physical optics : Birefringence
(350.6830) Other areas of optics : Thermal lensing
Nir Naftali, Ruth M. J. Benmair, Idit Pe’er, and Ammon Yogev, "Threshold of Stimulated Brillouin Scattering by Use of a Solar Pumped Laser," Appl. Opt. 41, 3576-3581 (2002)