Light source device
First Claim
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1. A light source device comprising:
- a laser light source;
an optical fiber type secondary higher harmonic wave generating element for generating secondary higher harmonic waves from an admitted incident laser beam emitted from said laser light source; and
a collimator lens for converting said secondary higher harmonic waves emerging from said secondary higher harmonic wave generating element into parallel beams of light, said collimator lens having an annular diffraction lattice pattern arranged such that respective oblique surfaces of diffraction lattices formed in concentric circles at equal spacings partially constitute side surfaces of a plurality of conical bodies concentric with said concentric circles.
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Abstract
A device for generating a second harmonic from a laser source is disclosed. The light from the laser passes through an optical fiber in which the second harmonic is generated. The light exiting from the optical fiber has a conical wave surface which is incident upon a collimating lens. Because the collimating lens has a diffraction lattice formed thereon, it is easy and efficient to collimate the second harmonic. It is also possible to decrease the size of the apparatus due to the use of the diffraction lattice formed on the collimator lens. This enable such a device to be particularly useful with a small sized light source such as a semiconductor laser.
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7 Claims
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1. A light source device comprising:
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a laser light source; an optical fiber type secondary higher harmonic wave generating element for generating secondary higher harmonic waves from an admitted incident laser beam emitted from said laser light source; and a collimator lens for converting said secondary higher harmonic waves emerging from said secondary higher harmonic wave generating element into parallel beams of light, said collimator lens having an annular diffraction lattice pattern arranged such that respective oblique surfaces of diffraction lattices formed in concentric circles at equal spacings partially constitute side surfaces of a plurality of conical bodies concentric with said concentric circles. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification