Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1993-08-09
1995-12-12
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356343, G01N 1506
Patent
active
054752353
ABSTRACT:
The incorporation of certain classes of solid state lasers into light scattering instrumentation is desirable because of their compact structure. However, mode hopping often causes the output power produced by such lasers to be unstable. The frequency of such output power fluctuations is often so broad that output power monitoring means, characteristic of the light scattering instrumentation into which such lasers are incorporated, cannot track accurately the temporal output power fluctuations. A method, and associated apparatus, is described whereby the laser drive current is modulated at low frequency and amplitude sufficient to induce and thereby control mode hopping so as to permit accurate measurement of the ratio of light scattering signals to the laser output power.
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Janik Gary R.
Phillips David T.
Nelms David C.
Nichols Steven L.
Wyatt Philip J.
Wyatt Technoloy Corporation
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