| 摘要 |
A longitudinally pumped laser is characterized by one segment in which the cavity mode is astigmatic. A solid state medium is mounted within the one segment, so that a volume of the astigmatic cavity mode within the laser medium defines a cavity mode volume. A pump beam is supplied collinearly with the cavity mode through a means causing astigmatic focusing of the pump beam in the laser medium to define a pumped volume within the laser medium. The astigmatically focusing means is mounted according to a precalculated parameter that achieves the best possible average match of the pumped volume with the cavity mode volume, in light of the physical limitations on layout of the resonant cavity. The one segment may be defined by a first off-axis spherical mirror and a second off-axis spherical mirror, with a Brewster-cut solid state medium mounted in between. The astigmatic focusing means is implemented with a third off-axis spherical mirror which focuses the pumping beam through the first off-axis spherical mirror collinearly with the cavity mode into the laser medium. The angle of incidence of the pumping beam on the third off-axis spherical mirror is precalculated to achieve the best average match between the pumped volume and cavity mode volume within the medium.
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