| 摘要 |
A simple and compact laser resonator is proposed which makes it possible to symmetrically operate a gain medium, preferably a semiconductor, which possesses more than one channel of emission. As a result higher output powers and/or better beam qualities and/or better spectral characteristics can be achieved. The resonator is very compact and ideally comprises only three optical elements: a laseractive gain medium ( 1 ), a cylindrical collimation lens ( 5 ), and a prism ( 6 ) which is adapted to the angle between the two emissions ( 4 ) and which carries a beam splitter ( 7 ) and a feedback mirror ( 9 ) on its faces. Preferably the gain medium ( 1 ) possesses a feedback element ( 2 ) and an antireflective coating ( 3 ) on its faces. If no antireflective coating ( 11 ) is desired the same effect can be achieved by arranging the angle of incidence to fulfill the Brewster-condition. In a preferred embodiment the gain medium ( 1 ) is a high-power diode laser chip with an internal stripe-array and/or the laser resonator is unstable along the direction parallel to the epitaxial layers. In alternative embodiments the feedback element ( 9 ) is wavelength selective like a grating, a dielectric filter, a holographic element or a volume Bragg grating.
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