Absolute distance measuring device

Optics: measuring and testing – Range or remote distance finding – With photodetection

Reexamination Certificate

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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.

REFERENCES:
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patent: 5790242 (1998-08-01), Stern et al.
patent: A 0997748 (2000-05-01), None
patent: A 2328739 (1999-03-01), None
Franco Quercioli et al.; “Optical Surface Profile Transducer”; Optical Engioneering; Feb. 1988; vol. 27, No. 2, pp. 135-142.
Sarah L. Dobson et al.; “Diffractive lenses for Chromatic Confocal Imaging”; Applied Optics; Jul. 10, 1997; vol. 36, No. 20, pp. 4744-4748.
Zorabedian, Paul et al., “Bistability in Grating-Tuned External-Cavity Semiconductor Lasers,”IEEE Journal of Quantum Electronics, vol. QE-23, No. 11, Nov. 1987, pp. 1855-1860.
Dobson, Sarah et al., “Diffractive lenses for chromatic confocal imaging,”Applied Optics, vol. 36, No. 20, Jul. 10, 1997, pp. 4744-4748.
Braun, David et al., “Broadband multilayer antireflection coating for semiconductor laser facets,”Optics Letters, vol. 20, No. 10, May 15, 1995, pp. 1154-1156.

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