Detector for Q-switched laser radiation

Details Detector for Q-switched laser radiation Detector for Q-switched laser radiation

1979-10-15

1981-06-30

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250214RC, H01J 4014

Patent

active

042764726

ABSTRACT:
A detector for detecting radiation from a Q-switched laser. The detector prises a plurality of silicon photo-diodes (10) which develop an output signal when struck by incident radiation from the Q-switched laser. The output of the photo-diodes is connected to a pulse-width discriminator (12) and a pulse-amplitude discriminator (13). The pulse-width discriminator generates an output signal only if the amplitude of the output pulse from the photo-diodes is less than 300 nanoseconds, signifying an input pulse from a Q-switched laser. The pulse-amplitude discriminator develops an output signal only when the photo-diode is saturated, again, indicating radiation from a Q-switched laser. The presence of a signal from either the pulse-width discriminator or the pulse-amplitude discriminator indicates that the incident radiation on the photo-diode was indeed from a Q-switched laser.

REFERENCES:
patent: 3400270 (1968-09-01), Durig
patent: 3660670 (1972-05-01), Howard
patent: 4032777 (1977-06-01), McCaleb

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