A narrow-linewidth high-power single-frequency laser is realized by pumping a
laser
cavity with a pair of polarized single-mode pump lasers that are driven below their
respective "micro-kink" regions and combined with a polarized beam combiner. The
pump lasers emit at the same wavelength and include a length of polarization-maintaining
(PM) fiber to maintain the polarization of the respective pumps. The laser cavity
is selected from microchip, fiber and waveguide devices and is provided with optical
feedback. This laser is capable of producing a stable high-power single-mode signal
with a very narrow linewidth, e.g. less than 10 kHz and preferably less than 3 kHz.