Optical system with laser pulse energy control

Details Optical system with laser pulse energy control Optical system with laser pulse energy control

1987-11-23

1988-10-04

Arnold, Bruce Y.

350316, 350403, G02B 2602, G02B 520

Patent

active

047752203

ABSTRACT:
An optical system with feedback control of the pulse energy of an attenuated laser pulse output by the system having a laser, attenuators, and a servo control subsystem. The attenuators include a beam attenuator module within the servo loop for variable adjustment of laser beam attenuation, and a plurality of light absorbing filters outside of the servo loop which can be selectively switched into or out of the beam path for further attentuation by known fixed amounts. A Brewster window, a photodiode and associated electronics sample the beam following attentuation by the beam attenuator module, and deliver a feedback signal to a microprocessor. The microprocessor compares the feedback signal and a used input desired pulse energy, then causes the beam attenuator module to adjust the amount attenuation so that the output beam energy is maintained within about five percent of the desired energy.

REFERENCES:
patent: 2766659 (1956-10-01), Baerwald
patent: 4632512 (1986-12-01), Haerig et al.

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