Control of output energy of pulsed light source

Details Control of output energy of pulsed light source Control of output energy of pulsed light source

H - Electricity

01

S

345/34

H01S 3/10 (2006.01) B23K 26/42 (2006.01) H01S 3/131 (2006.01) H01S 3/134 (2006.01)

Patent

CA 2025579

ABSTRACT OF THE DISCLOSURE A pulsed light source comprising a laser for emitting light in pulse form in response to an electric power from a power supply which is changeable in accordance with a control signal from an external circuit and a photodetector responsive to the light from the laser so as to produce an electric signal corresponding to the intensity of the reception light. The output signal of the photodetector is supplied to a comparator so as to compare the electric signal therefrom with a reference signal to output a signal proportional to the difference between the electric signal and the reference signal. In response to the output signal of the comparator, a control circuit produces the control signal to be supplied to the power supply by adding the output signal of the comparator to a predetermined signal to control the electric power outputted from the power supply to the laser.

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