Optical projector with beam monitor including sensing intensity of beam pattern not projected toward an object
First Claim
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1. Optical apparatus, comprising:
- a device package;
a radiation source, contained in the package and configured to emit a beam of coherent radiation;
a diffractive optical element (DOE), mounted in the package so as to receive and diffract the radiation from the radiation source into a predefined pattern comprising multiple diffraction orders that are projected from the package toward an object; and
an optical detector, which is positioned in the package so as to receive and sense an intensity of a portion of the pattern that is produced by the DOE but is not projected toward the object.
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Abstract
Optical apparatus includes a device package, with a radiation source contained in the package and configured to emit a beam of coherent radiation. A diffractive optical element (DOE) is mounted in the package so as to receive and diffract the radiation from the radiation source into a predefined pattern comprising multiple diffraction orders. An optical detector is positioned in the package so as to receive and sense an intensity of a selected diffraction order of the DOE.
53 Citations
20 Claims
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1. Optical apparatus, comprising:
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a device package; a radiation source, contained in the package and configured to emit a beam of coherent radiation; a diffractive optical element (DOE), mounted in the package so as to receive and diffract the radiation from the radiation source into a predefined pattern comprising multiple diffraction orders that are projected from the package toward an object; and an optical detector, which is positioned in the package so as to receive and sense an intensity of a portion of the pattern that is produced by the DOE but is not projected toward the object. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An optical method, comprising:
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transmitting a beam of coherent radiation through a diffractive optical element (DOE), mounted in a package, so as to diffract the radiation into a predefined pattern comprising multiple diffraction orders that are projected from the package toward an object; and monitoring a performance of the DOE by sensing, using an optical detector positioned in the package, an intensity of a portion of the pattern that is produced by the DOE but is not projected toward the object. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification