Voltage detection apparatus using short pulse light source with narrow spectral band width
AssigneeHamamatsu Photonics K.K.
InventorsTakuya Nakamura, Shinichiro Aoshima, Yutaka Tsuchiya
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Abstract
A light source for emitting a pulsed laser beam having an ultrashort pulse width and a voltage detector including the light source therein. The light source includes a laser driving unit for driving the laser source to output the pulsed laser beam while the intensity of the pulsed laser beam is stabilized. A chirp compensator is also included to compensate for a chirp in the pulsed laser beam. A wavelength selector is used to extract light having a desired wavelength from the pulsed laser beam, thereby obtaining a pulsed laser beam having an ultrashort pulse width and a desired narrow spectral band width.
Claims24
A voltage detection apparatus for optically detecting changes in a voltage which is being applied to an object, comprising:
- a light source comprising:
- a laser source for emitting a laser beam,
- a laser driving unit for driving said laser source, the laser driving unit including means for driving the laser source to output a pulsed laser beam and for stabilizing an intensity of the pulsed laser beam, and
- a spectral-band width narrowing unit for narrowing a spectral band width of the pulsed laser beam, said narrowing unit including means for performing chirp compensation and wavelength selected to convert the pulsed laser beam emitted from said laser source into a pulsed laser beam having an ultrashort pulse width and a desired narrow spectral band;
- a light modulator having an electrooptic characteristic for passing the pulsed laser beam from said spectral-band width narrowing unit therethrough, said light modulator adding information to said pulsed laser beam that represents an amount of change in the voltage applied to the object, said light modulator outputting the pulsed laser beam having the information representing said voltage change;
- and
- a photodetector for detecting the pulsed laser beam outputted from said light modulator to obtain the information representing the change in the voltage applied to the object.
A voltage detection apparatus for optically detecting changes in a voltage which is being applied to an object, comprising:
- an optical source for emitting an optical pulse beam;
- chirp compensation means for receiving the optical pulse beam emitted from said optical source and for compensating chirp of the optical pulse beam to convert the optical pulse beam into an optical pulse beam having an ultrashort pulse width;
- an optical modulator having an electrooptic characteristic for passing therethrough the optical pulse beam from said chirp compensation means, said optical modulator adding information to said optical pulse beam that represents an amount of change in the voltage applied to the object, said optical modulator outputting the optical pulse beam having the information representing the voltage change;
- and
- a photodetector for detecting the optical pulse beam outputted from said optical modulator to obtain the information representing the change in the voltage applied to the object.
Dependencies are inferred from the claim text.