Patent US5233620A successfully refreshed from Google Patents.
US5233620A
Expired / Lapsed
US
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Second-harmonic generating apparatus
Assignee: Oki Electric Industry Co Ltd
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Filing: 1991-08-27
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Granted: 1993-08-03
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Expires: 2011-08-27
Abstract
Abstract A second-harmonic generating device includes a laser diode for providing light of a fundamental wave, having end-facets at least one being an antireflection coated end-facet. An optical reflector forms an external resonator with one of the end-facets of the laser diode whereby a portion of the light from the laser diode is returned by the reflector to the laser diode. A second-harmonic generation element is disposed between the laser diode and the optical reflector, for producing a second-harmonic of the fundamental wave while the fundamental wave propagates in the second-harmonic generation element. In this way, the optical reflector determines the wavelength of the light of the fundamental wave so that the laser diode produces light with a wavelength satisfying a phase matching condition of the second-harmonic generation element.
Inventors
- 👤 Keisuke Shinozaki
- 👤 Saeko Oshiba
- 👤 Takeshi Kamijoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:01
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/10; H01S3/106; H01S3/108; H01S3/109; H01S5/00; H01S5/10; H01S5/14; H01S5/141
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
159 words
A second-harmonic generating apparatus comprising: a laser diode for providing light of a fundamental wave, having a high reflection coated end-facet and an antireflection coated end-facet; an optical reflector for forming an external resonator with said high reflection coated end-facet of said laser diode whereby a portion of the light from said laser diode is returned by said optical reflector to said laser diode; and second-harmonic generation means, disposed between said antireflection coated end-facet of said laser diode and said optical reflector, for producing a second-harmonic of said fundamental wave while said fundamental wave propagates in said second-harmonic generation means; wherein said optical reflector determines the wavelength of said light of said fundamental wave so that said laser diode produces light with a wavelength satisfying a phase matching condition of said second-harmonic generation means; said apparatus further comprising an optical filter for receiving a portion of the light from said optical reflector and filtering out said fundamental wave therefrom.
Claim 2
Dependent Claim
159 words
A second-harmonic generating apparatus comprising: a laser diode for providing light of a fundamental wave, having a high reflection coated end-facet and an antireflection coated end-facet; an optical reflector for forming an external resonator with said high reflection coated end-facet of said laser diode whereby a portion of the light from said laser diode is returned by said optical reflector to said laser diode; and second-harmonic generation means, disposed between said antireflection coated end-facet of said laser diode and said optical reflector, for producing a second-harmonic of said fundamental wave while said fundamental wave propagates in said second-harmonic generation means; wherein said optical reflector determines the wavelength of said light of said fundamental wave so that said laser diode produces light with a wavelength satisfying a phase matching condition of said second-harmonic generation means; said apparatus further comprising an optical filter for receiving a portion of the light from said optical reflector and filtering out said fundamental wave therefrom.
Claim 3
Dependent Claim
16 words
A second-harmonic generating apparatus according to claim 1, wherein said optical reflector comprises a diffraction grating.
Claim 4
Dependent Claim
18 words
A second-harmonic generating apparatus according to claim 1, wherein said optical reflector comprises a prism and a mirror.
Claim 5
Dependent Claim
17 words
A second-harmonic generating apparatus according to claim 1, wherein said second-harmonic generation means is a waveguide-type element.
Claim 6
Dependent Claim
18 words
A second-harmonic generating apparatus according to claim 1, wherein said second-harmonic generation means operates based on quasi-phase matching.
Claim 7
Dependent Claim
27 words
A second-harmonic generating apparatus according to claim 1, further comprising a half-wave plate disposed between said antireflective end-facet of said laser diode and said second-harmonic generation means.
Claim 8
Dependent Claim
151 words
A second-harmonic generating apparatus comprising: a laser diode for providing light of a fundamental wave, having a high reflection coated end-facet and an antireflection coated end-facet; an optical reflector for forming an external resonator with said high reflection coated end-facet of said laser diode whereby a portion of the light from said laser diode is returned by said optical reflector to said laser diode; and second-harmonic generation means, disposed between said antireflection coated end-facet of said laser diode and said optical reflector, for producing a second-harmonic of said fundamental wave while said fundamental wave propagates in said second-harmonic generation means; wherein said optical reflector determines the wavelength of said light of said fundamental wave so that said laser diode produces light with a wavelength satisfying a phase matching condition of said second-harmonic generation means; said apparatus further comprising a collimating lens disposed between said optical reflector and said second-harmonic generation means.
Claim 9
Dependent Claim
151 words
A second-harmonic generating apparatus comprising: a laser diode for providing light of a fundamental wave, having a high reflection coated end-facet and an antireflection coated end-facet; an optical reflector for forming an external resonator with said high reflection coated end-facet of said laser diode whereby a portion of the light from said laser diode is returned by said optical reflector to said laser diode; and second-harmonic generation means, disposed between said antireflection coated end-facet of said laser diode and said optical reflector, for producing a second-harmonic of said fundamental wave while said fundamental wave propagates in said second-harmonic generation means; wherein said optical reflector determines the wavelength of said light of said fundamental wave so that said laser diode produces light with a wavelength satisfying a phase matching condition of said second-harmonic generation means; said apparatus further comprising a collimating lens disposed between said optical reflector and said second-harmonic generation means.
Claim 10
Dependent Claim
16 words
A second-harmonic generating apparatus according to claim 7, wherein said optical reflector comprises a diffraction grating.
Claim 11
Dependent Claim
18 words
A second-harmonic generating apparatus according to claim 7, wherein said optical reflector comprises a prism and a mirror.
Claim 12
Dependent Claim
177 words
A second-harmonic generating apparatus comprising: a laser diode for providing light of a fundamental wave, having a high reflection coated end-facet and an antireflection coated end-facet; an optical reflector for forming an external resonator with said high reflection coated end-facet of said laser diode whereby a portion of the light from said laser diode is returned by said optical reflector to said laser diode; and second-harmonic generation means, disposed between said antireflection coated end-facet of said laser diode and said optical reflector, for producing a second-harmonic of said fundamental wave while said fundamental wave propagates in said second-harmonic generation means; wherein said optical reflector determines the wavelength of said light of said fundamental wave so that said laser diode produces light with a wavelength satisfying a phase matching condition of said second-harmonic generation means; wherein said second-harmonic generation means comprises a substrate having an optical waveguide formed in a surface thereof and extending along an axis thereof, and having a plurality of spaced apart domain-reversing regions formed in said surface as stripes extending orthogonal to said axis.
Claim 13
Dependent Claim
177 words
A second-harmonic generating apparatus comprising: a laser diode for providing light of a fundamental wave, having a high reflection coated end-facet and an antireflection coated end-facet; an optical reflector for forming an external resonator with said high reflection coated end-facet of said laser diode whereby a portion of the light from said laser diode is returned by said optical reflector to said laser diode; and second-harmonic generation means, disposed between said antireflection coated end-facet of said laser diode and said optical reflector, for producing a second-harmonic of said fundamental wave while said fundamental wave propagates in said second-harmonic generation means; wherein said optical reflector determines the wavelength of said light of said fundamental wave so that said laser diode produces light with a wavelength satisfying a phase matching condition of said second-harmonic generation means; wherein said second-harmonic generation means comprises a substrate having an optical waveguide formed in a surface thereof and extending along an axis thereof, and having a plurality of spaced apart domain-reversing regions formed in said surface as stripes extending orthogonal to said axis.
Claim 14
Dependent Claim
40 words
A second-harmonic generating apparatus according to claim 10, wherein said substrate comprises LiNbO 3 , wherein said domain-reversing regions comprise titanium diffused in said surface of said substrate, and wherein said optical waveguide is formed by a proton exchanging process.
Claim 15
Dependent Claim
78 words
A second-harmonic generating apparatus according to claim 10, wherein said domain-reversing regions are spaced apart along said axis by a coherence length l c , the domain-reversing regions having a width along said axis of said coherence length l c , the domain-reversing regions being thereby formed with a spatial period of 2l c , whereby the power of the second-harmonic of the fundamental wave is approximately proportional to the square of the length of the optical waveguide.
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