Coherent light generators – Particular component circuitry – Optical pumping
Patent
1991-06-05
1993-01-12
Scott, Jr., Leon
Coherent light generators
Particular component circuitry
Optical pumping
372 26, 372 87, 372 9, 372 27, H01S 300
Patent
active
051795655
ABSTRACT:
A low noise pulsed light source utilizing a laser diode for generating a short pulsed light of a high repetitive frequency. The low noise pulsed light source includes a laser diode drived by an electric pulse generator for emitting repetitive pulsed light; a current source for supplying a bias current to the laser diode; and a photodetector for detecting the repetitive pulsed light emitted from the laser diode; and control means. The control means modulates at least one of the bias current from the current source and the amplitude of a pulse signal generated from the electric pulse generator in accordance with an output signal from the photodetector such that the intensity of the pulsed light is kept unchanged and any noise involved in the same is reduce. A feedback system including the photodetector and the control means has a peak in its frequency characteristics within a frequency band for light detecting in a light measuring system utilizing the low noise pulsed light source.
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Aoshima Shinichiro
Nakamura Takuya
Takahashi Hironori
Tsuchiya Yutaka
Hamamatsu Photonics K.K.
Jr. Leon Scott
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