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| The present invention relates to lasers and optical resonators. In general, it is desirable that lasers be compact in size while, at the same time, producing a high power, high quality output beam. Unfortunately, in many laser systems such desired requirements cannot all be fulfilled simultaneously. The characteristics of the output beam depend on the distribution of the light inside the optical resonator of the laser. The light inside an optical resonator is distributed in well defined patterns termed modes. The optical quality of the output beam from an optical resonator is determined by its divergence, which differs for each mode within the resonator. The highest quality output beam has the least divergence. Changing the angular distribution of the output beam after it emerges from the laser reduces divergence. It is appreciated that in conventional optical laser resonators a compromise must be made between increased output power and output beam quality. The present invention provides an optical resonator comprising at least one spiral optical element operative to change the angular phase distribution of modes in the optical resonator, thereby to generally eliminate undesirable modes. This method increases the quality of the output beam.present relates lasers optical resonators |
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