| 摘要 |
<p>Apparatus 10 for amplifying a laser beam using a pump beam, comprised of a plurality of source beams 22, through an amplification medium 14; the amplification medium is pumped via a pump module 16 having a laser diode bar 18 and an optical assembly 30; the optical assembly has a first lens acting as a fast axis collimator 34 (Figure 3b), an array of second lenses acting as slow axis collimators 42 and a third focusing lens acting in both the fast and slow axis 36; the lenses are spaced so that the individual source beams from the emitters are imaged upon a facet of the amplification medium, are sized to fill the facet and overlap on the facet. In one embodiment the amplification medium is rectangular and has a long edge and a short edge oriented parallel to the slow axis and fast axis of the laser diode bar respectively. In another embodiment the source beams are directed so that peripheral source beams undergo total internal reflection on entering the amplification medium. In one embodiment several pump beams are imaged onto the amplification medium.</p> |
