An embodiment of the invention is directed to a dual-single-frequency fiber laser. A linear cavity formed by a short length of highly doped optical waveguide with distributed Bragg reflectors (DBRs) at respective ends, one of which is a polarization-maintaining PM-DBR, and a suitable pump source, provides orthogonally polarized dual-single-frequency laser emissions. Operating characteristics of the laser may be customized by appropriate design of the PM-DBR. Wavelength spacing between dual lasing wavelengths can be controlled via the birefringence parameters of the PM-DBR. Laser emission wavelengths may be controlled as a function of the period of the PM-DBR. Output power may be scaled upward by optimizing the PM-DBR reflectance and via pump power adjustment. Relaxation-oscillation effects (noise peaks) may be reduced by using a negative-feedback circuit on the pump laser. The use of a polarization-filtering component in regard to the orthogonal polarizations of the dual emissions enable laser operation in a single-polarization-single-frequency regime.
FEDERALLY SPONSORED RESEARCH
 This invention was made with government support under Cooperative Agreement No. DE-FC52-92SF19460 sponsored in part by the U.S. Department of Energy Office of Inertial Confinement Fusion. The government has certain rights in the invention.