Automatic laser beam expander-pinhole alignment system

Details Automatic laser beam expander-pinhole alignment system Automatic laser beam expander-pinhole alignment system

1990-07-12

1992-04-07

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

2502062, 356400, G01J 120

Patent

active

051030829

ABSTRACT:
This invention enables a laser beam, expanding from a pinhole aperture spatial filter, to be brought back on the optical axis of an optical system such as an optical correlator system and maintained there. The principle of operation is that photodetectors spaced in the outer region of the expanding beam detect a change in orientation of the incident laser beam, and the change is measured and an error signal is used to drive electrically controlled micrometers so as to restore and maintain alignment.

REFERENCES:
patent: 3012469 (1961-12-01), Clayborne
patent: 3781546 (1973-12-01), Christian et al.

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