Light-source unit
AssigneeSumitomo Electric Industries, Ltd.
InventorsNaota Uenishi, Takafumi Uemiya
Life of this patent
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Abstract
A light source unit for receiving and transmitting information to and from an optical disk or the like, which reshapes an elliptical in cross-section beam of laser light into a circular in cross-section beam of laser light by a beam shaping assembly composed of at least one lens having a cylindrical surface and an optical axis, the cylindrical surface having generatrix lines that are perpendicular to the optical axis of the lens, where the circularly shaped beam of laser light then enters a wavelength converter for generation of a second harmonic (half wavelength of the fundamental).
Claims19
A light source unit comprising:
- a laser source for generating a laser light beam having a fundamental wavelength and a generally elliptical shape in cross-section;
- a beam shaping assembly for converting the elliptically shaped in cross-section laser beam from the laser unit into a circularly shaped in cross-section beam, the beam shaping assembly including at least one lens having a cylindrical surface and an optical axis, the cylindrical surface having generatrix lines that are perpendicular to the optical axis of the lens;
- and
- a wavelength converter for receiving the light from the beam shaping assembly and for generating light of a second harmonic (half wavelength of the fundamental).
Dependencies are inferred from the claim text.