| 摘要 |
Apparatus for effecting harmonic conversion of a laser beam of predetermined frequency to provide plural harmonic components of the laser beam at frequencies different from the predetermined frequency, includes a housing ( 40 ) defining a hermetically sealed chamber able to be maintained at a pressure below atmospheric pressure. Also provided are port means for evacuating the chamber, and means ( 36, 37 ) defining an optical path for the laser beam and the components thereof through the housing and the chamber. A plurality of individual holders ( 20, 22, 24 ) are arranged for retaining respective frequency conversion crystals at spaced locations in the optical path. The crystals ( 20, 22, 24 ) can be individually aligned and heated within the chamber.
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