Laser with frequency multiplication
AssigneeAdlas Lasertechnik GmbH & Co. KG
InventorsHans-Peter Kortz, Wolf Seelert
Life of this patent
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Abstract
In order to produce higher harmonics more efficiently in a laser having a first optically nonlinear crystal acting as a frequency doubler, and at least one further optically nonlinear crystal acting as a frequency multiplier disposed behind the first nonlinear crystal in the direction of propagation of laser radiation produced by the laser, the first to second-to-last optically nonlinear crystals are selected to each have a walk-off angle in the range of 0.1.degree. to 6.degree., and all of the optically nonlinear crystals are disposed relative to one another in such a way that the plane of the principal section of one crystal contains a direction of small angular acceptance with respect to phase matching of a following crystal.
Claims6
A laser with a first optically nonlinear crystal acting as a frequency doubler and at least one further optically nonlinear crystal acting as a frequency multiplier, said first and further optically nonlinear crystals being disposed, beginning with the first optically nonlinear crystal and ending with a last optically nonlinear crystal, in a direction of propagation of laser radiation produced by the laser,
- wherein said optically nonlinear crystals are disposed relative to one another said direction of propagation in such a way that a plane of a principal section of one crystal includes a direction of small angular acceptance with respect to phase matching of a following crystal,
- wherein at least said first optically nonlinear crystal has a walk-off angle in the range of from 0.1.degree. to 6.degree. inclusive, and
- wherein a length of at least said first optically nonlinear crystal is selected so that a length of a large semiaxis of a cross-sectional area of a first frequency-multiplied laser beam is approximately equal to a diameter of a cross-sectional area of a second laser beam to be superimposed with the first.
Dependencies are inferred from the claim text.