Laser autoalignment system using distortion compensated reflecti

Details Laser autoalignment system using distortion compensated reflecti Laser autoalignment system using distortion compensated reflecti

1977-09-16

1979-02-20

Buczinski, S. C.

Optics: measuring and testing

Angle measuring or angular axial alignment

With photodetection remote from measured angle

250201, G01B 1126

Patent

active

041403983

ABSTRACT:
A method and system for automatically aligning a high power laser utilizing diffraction ruled reflection grating to sample the laser beam. A tiltable beam alignment mirror directs a laser beam in a path incident to the reflection grating which separates the incident beam into a reflected beam and first and second order diffraction beams. A tiltable distortion compensation mirror is positioned in the path of the two diffraction beams. Two auxiliary fixed mirrors are positioned such that the diffraction beams will reflect a predetermined number of times off the distortion compensation mirror prior to reflecting toward respective null position detectors. Error signals from these detectors are translated, in accordance with certain optical and mathematical relationships, into angular adjustments to the two tiltable mirrors, thereby compensating for the thermal distortion of the reflection grating and aligning the output laser beam.

REFERENCES:
patent: 3622788 (1971-11-01), Briggs
patent: 3825845 (1974-07-01), Angelbeck et al.
patent: 3872407 (1975-03-01), Hughes
patent: 3943457 (1976-03-01), Lehmberg

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