Photovoltage detector

Details Photovoltage detector Photovoltage detector

2007-03-20

2007-03-20

Pyo, Kevin (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S338400, C257S434000

Reexamination Certificate

active

10949120

ABSTRACT:
A method and system for detecting and monitoring a temporal and spatial distribution of a light beam are provided. A semiconductor substrate (120) having a given doping concentration range is partially exposed to an incident laser beam (150). Each part of the semiconductor structure (120) which is exposed to the laser beam is provided with an electrical contact (145), which outputs a voltage which is directly related to the optical power or energy incident on the exposed area. The thermo-voltage is produced by the laser induced thermal gradients. The sensitivity and inter-pixel cross-talk is determined by pixel pitch, doping concentration and window opening (110). Depending of the design, each pixel might be sensitive to the temporal variation of the laser beam.

REFERENCES:
patent: 3624542 (1971-11-01), Pugh
patent: 4243888 (1981-01-01), Gruhn
patent: 5623509 (1997-04-01), Iwano et al.
patent: 2002/0042831 (2002-04-01), Capone
patent: 2003/0164450 (2003-09-01), Bruchhaus

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