Detection system for Raman scattering employing holographic diff

Details Detection system for Raman scattering employing holographic diff Detection system for Raman scattering employing holographic diff

1990-03-22

1991-04-30

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

With raman type light scattering

356334, 350 37, G01N 2165, G01J 344

Patent

active

050112848

ABSTRACT:
The Raman scattering detector of this invention includes a source of collimated monochromatic illumination, a cube formed of two right angle prisms, a holographic optical element disposed between the prisms, a concentrating lens, a focusing lens and one or more photo detectors. The illuminating beam passes through the cube and is concentrated by the concentrating leans to a sample. Scattered light returned to the concentrating lens is substantially collimated upon return to the cube. The holographic optical element diffracts light at desired Raman wavelengths approximately 90 degrees without substantially affecting the original wavelength. The holographic optical element further disperses light at desired Raman wavelengths permitting them to be separated. The diffracted and dispersed wavelengths are focused on one or more detectors by the focusing lens.

REFERENCES:
patent: 4586819 (1986-05-01), Tochigi et al.
patent: 4856897 (1989-08-01), Fateley et al.

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