| 摘要 |
In order to enable adjustment of the output wavelength of a laser, there is provided a laser comprising a laser-active material (100), which is excitable at not less than two laser wavelengths to emit laser beams with a gain, said gain being different at the two laser wavelengths, a resonator comprising two end mirrors (102, 110; 130, 132), in which resonator the laser-active material (100) is arranged and which resonator is adapted, with respect to its resonance conditions, to the laser wavelength having the lower gain, wherein one of said end mirrors (110, 132) is partially transmissive for radiation at said laser wavelengths, an output mirror (116), which is partially transmissive for said laser wavelengths and is arranged following the partially transmissive end mirror (110, 132) in the optical path, an optical element (112, 120), which is arranged between the partially transmissive end mirror (110, 132) and the output mirror (116), on which radiation is incident at said laser wavelengths and which has an optical property effecting a wavelength selection of the output laser beam (118) output by the output mirror (116).
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