| 摘要 |
A resonator is disclosed having a mode control cavity and a power extraction cavity capable of being independently optimized to produce a laser beam having high power and good optical quality in the far field. The mode control cavity is a positive branch confocal unstable resonator having large geometric magnification and a low Fresnel number to provide mode discrimination against higher order radial and azimuthal modes such that the lowest loss mode, typically the lowest order fundamental mode is strongly favored. The power extraction cavity is adapted to accommodate a gain medium having a large volume. A first cone adapted to provide line of sight communication between the mode control cavity and the power extraction cavity optically couples the cavities and provides means for varying the diameter of radiation passing between the mode control cavity and the power extraction cavity.
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