Laser-induced breakdown spectroscopy with second harmonic guide light
AssigneeLambda Solutions, Inc.
InventorsWang Long Zhou, Yongwu Yang, Victor S. Sapirstein, Shaoging Peng
Life of this patent
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Abstract
A laser system comprising a laser for providing a laser beam, a non-linear optical crystal in the laser beam path creating a second order light, a laser beam expander in the beam path after the non-linear crystal, a dichromatic mirror in the beam path after the beam expander, an objective lens that focuses the laser beam on a sample and collects transmission from the sample before the sample transmission impacts the dichromatic mirror, a partial reflector of the second order light in the transmission path after the dichromatic mirror, and a coupler for coupling an optical component to the sample transmission.
Claims19
A laser system comprising:
- a laser for providing a laser beam;
- a non-linear optical crystal in the laser beam path creating a second order light;
- a laser beam expander in the beam path after the non-linear crystal;
- a dichromatic mirror in the beam path after the beam expander;
- an objective lens that focuses the laser beam on a sample and collects transmission from the sample before the sample transmission impacts the dichromatic mirror;
- a partial reflector of the second order light in the transmission path after the dichromatic mirror;
- and,
- a coupler for coupling an optical component to the sample transmission.
A laser induced breakdown spectroscopy system comprising:
- a laser for providing a laser beam;
- a non-linear optical crystal in the laser beam path for creating a second order light;
- a laser beam expander in the beam path after the non-linear crystal;
- a dichromatic mirror in the beam path after the beam expander;
- an objective lens that focuses the laser beam on a sample and collects transmission from the sample before the sample transmission impacts the dichromatic mirror;
- a partial reflector of the second order light in the transmission path after the dichromatic mirror;
- a coupler for coupling a first optical component to the sample transmission;
- a first attenuator in the transmission path after the partial reflector and before a second optical component;
- and
- a second attenuator in the beam path after the dichromatic mirror and before a power detector.
A method of aligning a laser beam on a sample comprising:
- providing a fundamental laser beam;
- passing the laser beam through a non-linear optical crystal creating a second order light beam;
- focusing the second order light beam on a sample while blocking the fundamental beam from the sample;
- and
- providing for the fundamental beam to impact the sample at the point of focus of the second order light beam.
A method of determining calibration of a laser comprising:
- providing a fundamental laser beam;
- passing the laser beam through a non-linear optical crystal creating a second order light beam;
- focusing the second order light beam on a detector at a predetermined pixel;
- and
- determining deviation of the second order light from the predetermined pixel for determining the state of calibration.
A method of determining the calibration of a laser comprising:
- providing a fundamental laser beam;
- passing the laser beam through a non-linear optical crystal creating a second order light beam;
- passing the second order light through a second non-linear crystal mixing the fundamental and the second harmonic to creating a third order light beam;
- focusing the second and third order light beams on a detector at predetermined pixels;
- and
- determining the amount of deviation of the second order light from its predetermined pixel.
Dependencies are inferred from the claim text.