US5671232A
Expired / Lapsed
US
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Second harmonic generation method and apparatus
Assignee: Samsung Electronics Co Ltd
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Filing: 1995-08-29
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Granted: 1997-09-23
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Expires: 2015-08-29
Abstract
Abstract A second harmonic generation apparatus provides a polarization element transmitting only light polarized in an extra-ordinary axis direction on the proceeding path of a second harmonic emitted from a resonator. The light polarized in the extra-ordinary axis direction is transmitted to a beam splitter, and a part of the polarized light is fed back to a feedback circuit, so that the temperature of a non-linear birefringent crystalline element inside resonator can be stably controlled and the output second harmonic can be stably produced.
Inventors
- 👤 Hang-woo Lee
- 👤 Sang-hak Lee
- 👤 Joseph Kilwhoan Chee
- 👤 Young-mo Hwang
- 👤 Yurij V. Tsvetkov
- 👤 Alexander V. Semenenko
- 👤 Ivan I. Kuratev
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:32
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/10; H01S3/106; H01S3/108; H01S3/109; H01S3/13; H01S3/136
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
94 words
A method for generating a second harmonic, which comprises the steps of: generating a fundamental wave by exciting a birefringent crystalline gain medium with a pumping laser; generating a second harmonic by exciting a non-linear birefringent crystalline element with said fundamental wave; polarizing said second harmonic and transmitting a specific polarized light of said second harmonic; separating a part of said polarized light and feeding said part back to a control circuit; converting the feedback light into an electrical signal; and controlling the temperature of said non-linear birefringent crystalline element with said electrical signal.
Claim 2
Independent Claim
94 words
A method for generating a second harmonic, which comprises the steps of: generating a fundamental wave by exciting a birefringent crystalline gain medium with a pumping laser; generating a second harmonic by exciting a non-linear birefringent crystalline element with said fundamental wave; polarizing said second harmonic and transmitting a specific polarized light of said second harmonic; separating a part of said polarized light and feeding said part back to a control circuit; converting the feedback light into an electrical signal; and controlling the temperature of said non-linear birefringent crystalline element with said electrical signal.
Claim 3
Dependent Claim
37 words
A method for generating a second harmonic according to claim 1, wherein the step of separating a part of said polarized light and feeding said part back to a control circuit is performed by a beam splitter.
Claim 4
Dependent Claim
34 words
A method for generating a second harmonic according to claim 1, wherein the step of polarizing said second harmonic and transmitting the polarized light of said second harmonic is performed by a polarization element.
Claim 5
Dependent Claim
43 words
A method for generating a second harmonic according to claim 1, wherein the step of polarizing said second harmonic and transmitting the polarized light of said second harmonic further comprises the step of polarizing only the light polarized in the extra-ordinary axis direction.
Claim 6
Dependent Claim
130 words
A second harmonic generation apparatus comprising: a resonator provided with an input mirror and an output mirror; a non-linear birefringent crystalline element and a gain medium provided on an optical axis placed in said resonator; a temperature control device controlling the temperature of said non-linear birefringent crystalline element; a beam splitter provided on the path of the second harmonic transmitted from said output mirror, and reflecting part of the second harmonic to an other path; a polarization element provided in between the output mirror and said beam splitter, and transmitting the light polarized in a specific direction; an optical detector provided on a path of said second harmonic reflected by said beam splitter; and a control circuit controlling said temperature control device with the signal emitted from said optical detector.
Claim 7
Dependent Claim
130 words
A second harmonic generation apparatus comprising: a resonator provided with an input mirror and an output mirror; a non-linear birefringent crystalline element and a gain medium provided on an optical axis placed in said resonator; a temperature control device controlling the temperature of said non-linear birefringent crystalline element; a beam splitter provided on the path of the second harmonic transmitted from said output mirror, and reflecting part of the second harmonic to an other path; a polarization element provided in between the output mirror and said beam splitter, and transmitting the light polarized in a specific direction; an optical detector provided on a path of said second harmonic reflected by said beam splitter; and a control circuit controlling said temperature control device with the signal emitted from said optical detector.
Claim 8
Dependent Claim
27 words
A second harmonic generation apparatus according to claim 5, wherein said polarization element has a polarization axis transmitting only the light polarized in the extra-ordinary axis direction.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-09-22 | 2001-03-24 | 2001-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-09-22 | 2005-03-24 | 2005-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-09-22 | 2009-03-24 | 2009-09-23 | $7700.00 | Window Closed / Lapsed |