Patent US4932030A successfully refreshed from Google Patents.
US4932030A
Expired / Lapsed
US
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Frequency stabilization of long wavelength semiconductor laser via optogalvanic effect
Assignee: Nokia Bell Labs
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Filing: 1989-06-05
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Granted: 1990-06-05
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Expires: 2009-06-05
Abstract
Abstract Frequency stabilization of a long wavelength semiconductor laser is achieved by employing the optogalvanic effect in a feedback control loop with the laser. Absolute references are obtained using noble gases such as argon (1.2 μm to 1.4 μm) and krypton (1.4 μm to 1.6 μm). Standard detection, feedback control and dithering lock-in techniques are used to insure proper frequency stabilization.
Inventors
- 👤 Yun C. Chung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:44
CPC Classifications
H; H01; H01S; H01S5/00; H01S5/06; H01S5/068; H01S5/0683; H01S5/0687
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
115 words
A stabilization arrangement for a semiconductor laser comprising: a semiconductor laser for generating an optical signal having a nominal operating wavelength greater than 1.2 μm; a gas discharge element for generating an optogalvanic signal at a predetermined wavelength corresponding to an atomic transition line of gas atoms in said gas discharge element in response to said optical signal, said gas atoms selected from the group consisting of noble gases, said nominal operating wavelength being substantially close to said predetermined wavelength; feedback control means responsive to said optogalvanic signal for dynamically adjusting a characteristic of said semiconductor laser to stabilize said nominal operating wavelength of the semiconductor laser to be substantially equal to said predetermined wavelength.
Claim 2
Dependent Claim
115 words
A stabilization arrangement for a semiconductor laser comprising: a semiconductor laser for generating an optical signal having a nominal operating wavelength greater than 1.2 μm; a gas discharge element for generating an optogalvanic signal at a predetermined wavelength corresponding to an atomic transition line of gas atoms in said gas discharge element in response to said optical signal, said gas atoms selected from the group consisting of noble gases, said nominal operating wavelength being substantially close to said predetermined wavelength; feedback control means responsive to said optogalvanic signal for dynamically adjusting a characteristic of said semiconductor laser to stabilize said nominal operating wavelength of the semiconductor laser to be substantially equal to said predetermined wavelength.
Claim 3
Dependent Claim
25 words
The stabilization arrangement defined in claim 1 wherein said noble gas is krypton and said nominal operating wavelength is between 1.4 μm and 1.6 μm.
Claim 4
Dependent Claim
111 words
A stabilization arrangement for a semiconductor laser comprising: a semiconductor laser for generating an optical signal having a nominal operating wavelength between 1.2 μm and 1.4 μm; a gas discharge element for generating an optogalvanic signal at a predetermined wavelength corresponding to an atomic transition line of gas atoms in said gas discharge element in response to said optical signal, said gas atoms including argon, said nominal operating wavelength being substantially close to said predetermined wavelength; feedback control means responsive to said optogalvanic signal for dynamically adjusting a characteristic of said semiconductor laser to stabilize said nominal operating wavelength of the semiconductor laser to be substantially equal to said predetermined wavelength.
Claim 5
Dependent Claim
111 words
A stabilization arrangement for a semiconductor laser comprising: a semiconductor laser for generating an optical signal having a nominal operating wavelength between 1.2 μm and 1.4 μm; a gas discharge element for generating an optogalvanic signal at a predetermined wavelength corresponding to an atomic transition line of gas atoms in said gas discharge element in response to said optical signal, said gas atoms including argon, said nominal operating wavelength being substantially close to said predetermined wavelength; feedback control means responsive to said optogalvanic signal for dynamically adjusting a characteristic of said semiconductor laser to stabilize said nominal operating wavelength of the semiconductor laser to be substantially equal to said predetermined wavelength.
Claim 6
Dependent Claim
47 words
The stabilization arrangement as defined in claim 3 wherein said atomic transition line is selected from the group consisting of 2p 10 -3d 5 , 2p 3 -2s 2 , 2p 10 -3d 6 , 2p 9 -3d 4 , and 2p 3 -3s 1 '" .
Claim 7
Dependent Claim
139 words
A stabilization arrangement for a semiconductor laser comprising: a semiconductor laser for generating an optical signal having a nominal operating wavelength between 1.4 μm and 1.6 μm; a gas discharge element for generating an optogalvanic signal at a predetermined wavelength corresponding to an atomic transition line of gas atoms in said gas discharge element in response to said optical signal, said gas atoms including krypton, said atomic transition line is selected from the group consisting of 2p 8 -3d 1 " , 2p 10 -3d 3 , and 2p 6 -2s 5 , said nominal operating wavelength being substantially close to said predetermined wavelength; feedback control means responsive to said optogalvanic signal for dynamically adjusting a characteristic of said semiconductor laser to stabilize said nominal operating wavelength of the semiconductor laser to be substantially equal to said predetermined wavelength.
Claim 8
Dependent Claim
139 words
A stabilization arrangement for a semiconductor laser comprising: a semiconductor laser for generating an optical signal having a nominal operating wavelength between 1.4 μm and 1.6 μm; a gas discharge element for generating an optogalvanic signal at a predetermined wavelength corresponding to an atomic transition line of gas atoms in said gas discharge element in response to said optical signal, said gas atoms including krypton, said atomic transition line is selected from the group consisting of 2p 8 -3d 1 " , 2p 10 -3d 3 , and 2p 6 -2s 5 , said nominal operating wavelength being substantially close to said predetermined wavelength; feedback control means responsive to said optogalvanic signal for dynamically adjusting a characteristic of said semiconductor laser to stabilize said nominal operating wavelength of the semiconductor laser to be substantially equal to said predetermined wavelength.
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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) | 1993-06-04 | 1993-12-04 | 1994-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-04 | 1997-12-04 | 1998-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-04 | 2001-12-04 | 2002-06-05 | $7700.00 | Window Closed / Lapsed |