Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1985-09-26
1987-01-20
LaRoche, Eugene R.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
356355, G01B 902, G01B 1102
Patent
active
046377255
ABSTRACT:
An interferometer in Mach-Zehnder configuration comprises beamsplitters (10, 12) and mirrors (11, 13), which divide an optical beam whose wavefront is to be monitored into an information component and a reference component, and which recombine the information and reference components to form an interference pattern that changes dynamically at a spatial light modulator (14) in response to dynamic variations in the atmosphere through which the beam passes. A spatial light filter (15) comprising a plate with a pin-hole aperture is positioned to transmit the reference component of the beam, but with second-order aberrations being removed from the reference component prior to recombination of the information and reference components. The wavefront of the reference component that recombines with the information component is a substantially unaberrated version of the wavefront of the beam whose wavefront is to be monitored. An acousto-optical beam-steering device (20) steers the reference component in real time so as to maintain substantially continuous alignment of a maximum-intensity centroid of the reference component with respect to the pin-hole aperture of the spatial light filter (15).
REFERENCES:
patent: 3494698 (1970-02-01), Neumann
patent: 4030830 (1977-06-01), Holly
patent: 4594002 (1986-06-01), McNally
Stefanov Michael E.
Sullivan Brian J.
Ticknor Anthony J.
LaRoche Eugene R.
Lockheed Missiles & Space Company Inc.
Morrissey John J.
Mottola Steven J.
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