Particle counter employing a chromium based solid-state laser wi

Details Particle counter employing a chromium based solid-state laser wi Particle counter employing a chromium based solid-state laser wi

1997-06-23

1999-05-11

Rosenberger, Richard A.

Optics: measuring and testing

By particle light scattering

With photocell detection

G01N15/06

Patent

active

059033479

ABSTRACT:
A particle detector employs a resonant cavity having a chromium doped colquiriite crystal lasing medium, such as an Cr:LiSrAlF.sub.6 crystal, adjacent to an intra-cavity view volume. The resonant cavity is defined by two spaced apart mirrors, with the crystal positioned between them, defining a light path through the crystal, but most of the light does not escape past the mirrors. The view volume is positioned in the light path, between the first mirror and the laser medium, to introduce particles into the resonant cavity so that light impinging thereupon produces scattered light. A detector is disposed to sense light scattered from the view volume and produces signals proportional to the light sensed. Harmonic generators are used in alternate embodiments to produce sub-micron wavelengths. Optical coatings on mirrors forming cascaded cavities are used to isolate a harmonic wavelength in a cavity containing the view volume.

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