EP0486192A2
Expired / Lapsed
EP
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A semiconductor laser system with a non linear crystal resonator
Assignee: International Business Machines Corp
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Filing: 1991-11-04
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Granted: —
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Expires: 2011-11-04
Abstract
Abstract A laser diode with a low reflectivity output facet provides infrared light to a nonlinear crystal resonator such that a portion of the infrared light is converted to blue light. A mirror is located on the opposite side of the nonlinear crystal resonator from the laser. The mirror allows the blue light to pass, but reflects the infrared light exiting the resonator back through the resonator and into the laser diode. The laser diode is thereby locked at the resonance frequency of the nonlinear crystal resonator. <IMAGE>
Inventors
- 👤 Wilfried Lenth
- 👤 William Paul Risk
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 17:32
CPC Classifications
H; H01; H01S; H01S5/00; H01S5/10; H01S5/14; H01S5/141; G; G02; G02F; G02F1/00; G02F1/35; G02F1/353; G02F1/3542; G02F1/37; H01S3/00; H01S3/05; H01S3/08; H01S3/08059; H01S3/081; H01S3/082; H01S3/10; H01S3/106; H01S3/108; H01S3/109; H01S5/06; H01S5/065; H01S5/068; H01S5/0683; H01S5/0687; H01S5/142
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
76 words
A laser system of the kind in which a nonlinear crystal resonator (16) is used to convert fundamental frequency light into second harmonic light, said system incorporating feedback means (18) in optical communication with the nonlinear crystal resonator, characterised in that the system further incorporates a laser element (12) having an output facet with a reflectivity of 5% or less, and the feedback means and the laser element together operate to generate said fundamental frequency light.
Claim 2
Dependent Claim
76 words
A laser system of the kind in which a nonlinear crystal resonator (16) is used to convert fundamental frequency light into second harmonic light, said system incorporating feedback means (18) in optical communication with the nonlinear crystal resonator, characterised in that the system further incorporates a laser element (12) having an output facet with a reflectivity of 5% or less, and the feedback means and the laser element together operate to generate said fundamental frequency light.
Claim 3
Dependent Claim
28 words
The system of claim 1, wherein the nonlinear crystal resonator comprises a nonlinear crystal (120) located within a ring resonator having three reflective internal surfaces (122, 124, 126).
Claim 4
Dependent Claim
46 words
The system of claim 2 wherein the first reflective surface is located proximate a first side of the crystal, the second reflective surface is located proximate a second side of the crystal, and the third reflective surface is located proximate a third side of the crystal.
Claim 5
Dependent Claim
69 words
The system of claim 1, wherein the nonlinear crystal resonator comprises a nonlinear crystal (230), a first mirror (220), a second mirror (222), and a third mirror (224), the first and second mirrors being located along an output line determined by the path of fundamental frequency light from the laser element to the resonator, with the crystal being located along said output line between said first and second mirrors.
Claim 6
Dependent Claim
21 words
The system of claim 1, wherein the nonlinear optical resonator comprises a nonlinear crystal between two reflective internal surfaces (32, 34).
Claim 7
Dependent Claim
21 words
The system of claim 5, wherein the two reflective internal surfaces are located proximate first and second sides of the crystal.
Claim 8
Dependent Claim
23 words
The system of claim 1, wherein the nonlinear crystal resonator includes a nonlinear crystal, a beam splitter (308) and a reflecting mirror (320).
Claim 9
Dependent Claim
55 words
The system of claim 7 wherein the beam splitter is located along an output line determined by the path of fundamental frequency light from the laser element to the resonator, and the mirror is located along a line which is perpendicular to said output line, said line intersecting the output line at the beam splitter.
Claim 10
Independent Claim
15 words
The system of any preceding claim, wherein the laser element has an anti-reflective facet coating.
Claim 11
Independent Claim
18 words
The system of any preceding claim, wherein the nonlinear crystal resonator is impedance matched to the laser element.
Claim 12
Independent Claim
37 words
The system of any preceding claim, wherein the feedback means consists of a feedback mirror (18) for reflecting said fundamental frequency light back into the laser element and for allowing said second harmonic light to pass through.
Claim 13
Dependent Claim
61 words
A laser data system comprising: a laser system as claimed in any preceding claim; an optical recording medium (530); an optical transmission means for directing said second harmonic tight from the resonator to the optical recording medium; and optical reception means for receiving a reflected second harmonic light beam from the optical recording medium and providing a data signal responsive thereto.
Claim 14
Independent Claim
97 words
A method for generating second harmonic light from fundamental frequency light in a laser system incorporating feedback means (18) in optical communication with a nonlinear crystal (30), said method comprising the steps of repeatedly passing the fundamental frequency light through the nonlinear crystal to create second harmonic light; and separating the second harmonic light from the fundamental frequency light; said method being characterised by the step of generating said fundamental frequency light with a laser element (12) in conjunction with the feedback means, said laser element having an output facet with a reflectivity of 5% or less.
Claim 15
Independent Claim
97 words
A method for generating second harmonic light from fundamental frequency light in a laser system incorporating feedback means (18) in optical communication with a nonlinear crystal (30), said method comprising the steps of repeatedly passing the fundamental frequency light through the nonlinear crystal to create second harmonic light; and separating the second harmonic light from the fundamental frequency light; said method being characterised by the step of generating said fundamental frequency light with a laser element (12) in conjunction with the feedback means, said laser element having an output facet with a reflectivity of 5% or less.
References Cited (Backward Citations)
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