Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1985-09-09
1987-03-31
LaRoche, Eugene R.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
356354, G01B 902
Patent
active
046539212
ABSTRACT:
A real-time radial shear interferometer for monitoring the quality of the wavefront of an optical beam comprises (with reference to FIG. 3) a pair of beamsplitters (40, 45) and a pair of beam-folding mirrors (44, 46) arranged in Mach-Zehnder format. An afocal telescope (41) and a diffraction grating (30) cause a transmitted component of the beam to be separated into a plurality of diffraction maxima, and an afocal telescope (47) and a diffraction grating (31) cause a reflected component of the beam to be separated into a plurality of diffraction maxima. Diffraction beams formed from the transmitted component of the beam are combined with corresponding diffraction beams formed from the reflected component of the beam to produce a zeroth-order interferogram and positive and negative first-order interferograms. It is shown by Fourier analysis that a phase shift inherently occurs between the zeroth-order interferogram and the positive and negative first-order interferograms produced by optical interference between corresponding zeroth-order and positive and negative first-order diffraction beams.
REFERENCES:
patent: 3829219 (1974-08-01), Wyant
patent: 4413909 (1983-11-01), Pohle
Schmutz, L. E., et al., "Integrated Imaging Irradiance (I.sup.3) Sensor: a New Method for Real-Time Wavefront Mensuration", Adaptive Optical Components II, v. 179, 1979, pp. 75-80.
LaRoche Eugene R.
Lockheed Missiles & Space Company Inc.
Morrissey John J.
Mottola Steven J.
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