Radiation characteristic measuring apparatus for laser diode

Details Radiation characteristic measuring apparatus for laser diode Radiation characteristic measuring apparatus for laser diode

1986-09-04

1989-01-17

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

356224, H01J 4014

Patent

active

047989505

ABSTRACT:
An apparatus for measuring a radiation characteristic of a laser diode. An AC signal and a step-like DC voltage are applied to the laser diode and the radiant power output thereof is received by a photodiode having an output to which a first amplifier, a transformer, a capacitor and an AC amplifier for extracting the AC signal. The apparatus further comprises a first switch connected between the input of the first amplifier and the capacitor, and a second switch connected between both ends of the transformer. Every time the step-like voltage is stepped up, the first and second switches are closed for a short time as compared with the duration of a step period to protect the measurement from the influence of the change in the DC voltage.

REFERENCES:
patent: 3687558 (1972-08-01), Rex
patent: 4459475 (1984-07-01), Flint et al.

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