| 摘要 |
A solid state laser amplifier includes a diode pump source and a crystal capable of lasing light at a fundamental wavelength. The source is directed into the crystal, and a seed beam is also coupled along an input path into the crystal to initiate lasing, which amplifies the seed beam. The amplifier is intended for intermittent use, or use over a wide range of input power levels, so that variations of the energy input and output give rises to extreme thermal challenges. To manage heat stress in the amplifier crystal, both the pump beam and the seed beam are directed into the crystal through a cap of undoped material which is non-absorbent at the seed or pump wavelength, and is diffusion bonded to the crystal, thus serving as a thermal reservoir and allowing the laser to operate over a broad power band, with high gain over an extended range of saturation values, and to maintain stable operation during intermittent or changing operation of the seed laser. In a preferred embodiment the crystal is pumped from both ends by separate diode sources, with a continuous wave pump power of 10-40 W or more, and utilizes a vanadate crystal which lases at the band of a garnet or vanadate laser, providing a gain of two or more over an input seed beam power range from milliwatts to ten watts or more.
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