Abstract
We report on an efficient, narrow linewidth, two-stage fiber amplifier at based on Yb-doped double-clad fibers. The fibers are cooled to liquid-nitrogen temperatures in order to suppress absorption at the operating wavelength. We achieved output powers of up to at a linewidth of less than by seeding the amplifier with the radiation from an external cavity diode laser.
© 2006 Optical Society of America
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