Optics: measuring and testing – Range or remote distance finding – With photodetection
Reexamination Certificate
2008-01-08
2008-01-08
Tarcza, Thomas H. (Department: 3662)
Optics: measuring and testing
Range or remote distance finding
With photodetection
C356S004100, C356S004010
Reexamination Certificate
active
07317513
ABSTRACT:
An external cavity laser has an external cavity that is formed between a target surface and a laser diode facet located farthest from the target surface. A chromatic dispersive element is disposed in the external cavity, and focuses light from the laser diode such that one wavelength is focused at a focal spot on the target surface. Light reflected from the focal spot on the target surface is the predominant wavelength coupled back into the laser waveguide, which provides a feedback signal that determines the oscillation wavelength of the laser diode. The laser diode therefore outputs a well-defined wavelength of light which corresponds to the distance between the chromatic dispersive element and the target surface.
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Dobson, Sarah et al., “Diffractive lenses for chromatic confocal imaging,”Applied Optics, vol. 36, No. 20, Jul. 10, 1997, pp. 4744-4748.
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Mitutoyo Corporation
Oliff & Berridg,e PLC
Ratcliffe Luke D.
Tarcza Thomas H.
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