THIRD-HARMONIC GENERATING APPARATUS FOR LASER-RADIATION
First Claim
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1. Optical apparatus for generating third-harmonic radiation from plane-polarized fundamental radiation, comprising:
- a polarization loop including a plurality of mirrors, a polarization-selective reflector and a polarization rotator, the polarization loop arranged such that the fundamental radiation enters the loop via the polarization-selective reflector, makes a first circuit of the loop, makes a second circuit of the loop, and then exits the loop via the polarization-selective reflector, at each location on the loop the fundamental radiation on the first circuit of the loop having a polarization orientation orthogonal to the polarization orientation of the fundamental radiation on the second circuit of the loop, the polarization rotator rotating the polarization of the fundamental radiation between the orthogonal polarization orientations; and
first and second optically nonlinear crystals located in the polarization loop, the first optically nonlinear crystal arranged to generate second-harmonic radiation by frequency doubling fundamental radiation on the second circuit of the loop, and the second optically nonlinear crystal arranged to generate the third-harmonic radiation by sum-frequency mixing second-harmonic radiation generated in the first optically nonlinear crystal and fundamental radiation on the first circuit of the loop.
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Abstract
A third-harmonic conversion arrangement includes a second-harmonic generating crystal and a third-harmonic generating crystal arranged in a polarization loop. The polarization loop causes plane-polarized fundamental-wavelength radiation being converted to make two passes through the crystals in orthogonally-opposed polarization orientations.
1 Citation
19 Claims
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1. Optical apparatus for generating third-harmonic radiation from plane-polarized fundamental radiation, comprising:
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a polarization loop including a plurality of mirrors, a polarization-selective reflector and a polarization rotator, the polarization loop arranged such that the fundamental radiation enters the loop via the polarization-selective reflector, makes a first circuit of the loop, makes a second circuit of the loop, and then exits the loop via the polarization-selective reflector, at each location on the loop the fundamental radiation on the first circuit of the loop having a polarization orientation orthogonal to the polarization orientation of the fundamental radiation on the second circuit of the loop, the polarization rotator rotating the polarization of the fundamental radiation between the orthogonal polarization orientations; and first and second optically nonlinear crystals located in the polarization loop, the first optically nonlinear crystal arranged to generate second-harmonic radiation by frequency doubling fundamental radiation on the second circuit of the loop, and the second optically nonlinear crystal arranged to generate the third-harmonic radiation by sum-frequency mixing second-harmonic radiation generated in the first optically nonlinear crystal and fundamental radiation on the first circuit of the loop. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. Optical apparatus for generating third-harmonic radiation from plane-polarized fundamental radiation, comprising:
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a polarization loop including a plurality of mirrors, a polarization-selective reflector and a polarization rotator, the polarization loop arranged such that the fundamental radiation enters the loop via the polarization-selective reflector, makes a first circuit of the loop, makes a second circuit of the loop, and then exits the loop via the polarization-selective reflector, the fundamental radiation plane-polarized in a first orientation on the first circuit of the loop between the polarization-selective reflector and the polarization rotator, the fundamental radiation polarized in a second orientation orthogonal to the first orientation on the second circuit of the loop between the polarization-selective reflector and the polarization rotator, the polarization rotator rotating the polarization of the fundamental radiation between the first orientation and the second orientation; and first and second optically nonlinear crystals located in the polarization loop between the polarization-selective reflector and the polarization rotator, the first optically nonlinear crystal arranged to generate second-harmonic radiation by frequency doubling fundamental radiation on the second circuit of the loop, and the second optically nonlinear crystal arranged to generate the third-harmonic radiation by sum-frequency mixing second-harmonic radiation generated in the first optically nonlinear crystal and fundamental-wavelength radiation on the first circuit of the loop. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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Specification