Device for accurately focussing a laser beam

Details Device for accurately focussing a laser beam Device for accurately focussing a laser beam

1985-04-04

1986-12-02

LaRoche, Eugene R.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

G01J 120

Patent

active

046266739

ABSTRACT:
Device for correcting deviations upon focussing a laser beam, which comprises electronic means, among which a quadrant detector, for forming with the output signals of said quadrant detector a correction signal -K.sub.1 V.sub.c H.sub.c /.SIGMA. (18), which is added (19) to the focussing signal (A+C)-(B+D) formed in circuit 14, A, B, C and D being the output signals of the quadrant detector (9a, 9b, 9c, 9d),

REFERENCES:
patent: 4482803 (1984-11-01), Lacotte et al.

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