Spectral narrowing technique
US5095492A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 17, 1990 |
| Grant date | Mar 10, 1992 |
| Priority date | — |
| Expiry date | Jul 17, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S3/1055
- WIPO fieldOptics
- WIPO sectorInstruments
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…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.