Bragg cell spectral analyzer with a prism expansion system

Details Bragg cell spectral analyzer with a prism expansion system Bragg cell spectral analyzer with a prism expansion system

1985-02-06

1986-12-02

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

250216, 324 77K, 350358, G01J 306, G01R 2117, G02F 133

Patent

active

046261028

ABSTRACT:
A Bragg cell spectral analyzer with a prism expansion system for a laser beam, which has a Gaussian cross-sectional distribution of light intensity, is generally superimposed with stray light, and is conducted along a path through the system to a Bragg cell characterized by an aperture diaphragm being positioned in the path before the prism expansion system with the diameter of the aperture being selected to be larger than the half-width value of the Gaussian cross-sectional distribution. The prism expansion system only expands the laser beam to such a degree that the half-width value of the Gaussian cross-sectional distribution is smaller than the diameter of an aperture of the Bragg cell. As a result thereof, the diffraction side lobes of the spectrum can be reduced by apodization relative to the principal maximum of the spectrum and stray light contained in the laser beam can be blanked out.

REFERENCES:
Hecht, "Spectrum Analysis Using Acousto-Optic Devices", Optical Engineering, vol. 16, No. 5, Sep./Oct. 1977, pp. 461-466.
P. Jacquinot et al, "Apodisation", Progress in Optics III, E. Wolf, Editor, North Holland Publishing Co., Amsterdam, 1964, pp. 49-58.
J. Ost et al, "Techniques for Generation and Adjustment of Reference and Reconstructing Waves in Precision Holography", Optics Technology, Nov. 1969, pp. 251-254.

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