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US 10,241,345 B2Granted
Laser system preserving polarization through a freely movable beam delivery system
AssigneeCandela Corporation
InventorsXiaoming Shang, Jayant Bhawalkar
Life of this patent
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Abstract
Disclosed is an apparatus and a method to preserve linearly polarized laser beam when it passes through a freely twisting beam delivery system such as an articulated arm. The polarization of the output beam from the delivery system will be stable and the same as the polarization of the input beam to the delivery system, and can be used to pump anisotropic laser crystals as well as nonlinear optical crystals.
Claims11
A laser system comprising:
- a laser light source configured to emit a first beam of plane polarized light;
- a beam delivery system configured to receive emitted first beam of plane polarized light and direct received first beam of plane polarized light to a target, the beam delivery system configured to support change in direction and position of received first beam of plane polarized light to a desired point on a target while maintaining the plane of polarization of the delivered beam on the target fixed;
- and
- wherein the beam delivery system contains mirrors configured to introduce a phase difference of zero radians or pi radians upon reflection from that mirror to preserve a polarization plane of the first beam of polarized light.
1 more element
A method of providing a plane polarized laser light comprising:
- operating a laser light source to emit a first beam of plane polarized light;
- providing a beam delivery system configured to receive emitted first beam of plane polarized light and direct received first beam of polarized light to a target and wherein the beam delivery system includes a number of mirrors coated by a polarization preserving coating;
- and
- using a first and second quarter wave plates with a first quarter wave plate located before the beam delivery system and a second plate located after the beam delivery system to transform polarization orientation of a polarized laser beam.
1 more element
Dependencies are inferred from the claim text.