Patent ID: 8761210

Claim:
A method of generating a high-power, narrow linewidth laser signal, comprising: a. supplying a zeroth-order Stokes wavelength seed signal at 1069 nm having a linewidth sufficient to prevent significant Stimulated Brillouin Scattering; b. passing the 1069 nm Stokes signal through a first isolator and then into a wavelength division multiplexer; c. supplying a second-order Stokes wavelength seed signal at 1178 nm having a maximum linewidth of 10 MHz; d. passing the 1178 nm Stokes signal through a second isolator and then into the wavelength division multiplexer; e. passing the 1069 nm Stokes signal and the 1178 nm Stokes signal through the wavelength division multiplexer; f. injecting the 1069 nm Stokes signal and the 1178 nm Stokes signal into a rare-earth-doped amplifier to create an amplified 1069 nm Stokes signal and also output the 1178 nm Stokes signal; g. passing the amplified 1069 nm Stokes signal and the 1178 nm Stokes signal through a 1121 nm long period or tilted Bragg grating centered at 1121 nm; and h. passing the amplified 1069 nm Stokes signal and the 1178 nm Stokes signal through an 1121 nm Raman resonator comprised of a Raman fiber having an input end and an output end; a pair of reflective Bragg gratings each tuned to have a center wavelength of 1121 nm, with one of the pair of reflective Bragg gratings being located at the input end and the other being located at the output end; and a reflective Bragg grating tuned to 1069 nm, lying in between the pair of reflective Bragg gratings, and being located nearer to the output end than the input end, whereby i. the 1178 nm Stokes signal is amplified and then output through the output end of the Raman fiber as an output 1178 nm Stokes signal.