Coherent light generators – Particular resonant cavity – Specified cavity component
Patent
1990-07-17
1992-03-10
Scott, Jr., Leon
Coherent light generators
Particular resonant cavity
Specified cavity component
372 20, 372 33, H01S 308
Patent
active
050954920
ABSTRACT:
Monochromatic light from a laser gain generator passes through a first aperture to a beam expander which expands the beam width and reduces the angular divergence of the beam. The light from the beam expander has a curved wavefront because of (1) light diffraction in the aperture and (2) deviations from planar surfaces in the optical components in the light path. The light is then reflected by a first mirror to a grating which has a plurality of steps in a stepped configuration. The grating is adjustable curved so that the steps in the grating are parallel to the curved wavefront and so that light from only a particular band of wavelengths is reflected back to the first mirror. The light then passes back through the beam expander, which compresses the beam width, to the discharge chamber for further amplification. The light then passes through a second aperture to a partially reflecting mirror. A portion of the light is reflected by the partial mirror back to the discharge chamber for further amplification. The grating curvature is adjustable controlled by an apparatus which contacts the grating at three spaced points and which applies a controlled force to the grating along a line extending between one of the points and a position midway between the other two points. The grating curvature may be servoed to maintain the bandwidth of the laser light at a particular value as various components age.
REFERENCES:
patent: 3443243 (1969-05-01), Datel
patent: 4696012 (1987-09-01), Harshaw
patent: 4873692 (1989-10-01), Johnson et al.
patent: 4951285 (1990-08-01), Cole
Cymer Laser Technologies
Jr. Leon Scott
Roston Ellsworth R.
Schwartz Charles H.
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