Patent ID: 7764720
Filing Date: 2010-07-27
Classification: H01S

Abstract:
1. A method of producing a high-powered narrow linewidth laser output by reducing the stimulated Brillouin scattering effect, the method comprised of: providing a double clad gain fiber having an outer and an inner cladding and a rare earth doped core such that most of the laser light is contained in the core, said gain fiber having an input and an output end; splicing a cladding mode stripper at the output end of said gain fiber to thereby couple out unused pump light; pumping said gain fiber at the input end by a pump source to produce population inversion; providing a first seed light source and a second seed light source, said first seed source having a linewidth of less than 1 MHz and a wavelength separation of approximately 10 nm or more from said second seed light source, and said second seed source having higher emission and absorption cross-sections than said first seed light source and having at least a four times higher input power level than said first seed source; optically isolating said seed sources to prevent damage from backward scattered light; and optically combining said first and second seed light sources prior to coupling them into the input end of said gain fiber, whereby said first seed light source may be amplified to provide a high-powered narrow-linewidth laser output of 100 W to more than 1 kW output power.