Patent US5339324A successfully refreshed from Google Patents.
US5339324A
Expired / Lapsed
US
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Laser beam generator including automatic resonator length control
Assignee: Sony Corp
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Filing: 1993-07-22
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Granted: 1994-08-16
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Expires: 2013-07-22
Abstract
Abstract A laser beam generator for making wavelength conversion automatically controls the length of an external resonator of a laser source to perform wavelength conversion at a high efficiency by pulling-in a servo using a resonator length error signal and a reflected light signal. A sample-and-hold circuit is used to detect the error signal from the detected light signal which is reflected from the external resonator.
Inventors
- 👤 Naoya Eguchi
- 👤 Michio Oka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:38
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/35; G02F1/37; G02F1/353; G02F1/3542; H; H01; H01S; H01S3/00; H01S3/005; H01S3/0092; H01S3/10; H01S3/13; H01S3/139; H01S3/1398
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
133 words
A laser beam generator for generating a wavelength converted laser beam comprising: a source of light; an external resonator; a pair of reflecting means provided at said external resonator; a nonlinear optical crystal provided in said external resonator and provided an incident laser beam from said source of light thereto; a moving means for moving at least one of said pair of reflecting means in an optical axis direction and making resonator length control; and wherein said moving means is supplied with a resonator length error signal due to a deviation between the length of said external resonator and that to said incident laser beam and with a reflected signal from said resonator as a result of reflection of said incident laser beam from said resonator as pulling-in signals for resonator length servo.
Claim 2
Dependent Claim
133 words
A laser beam generator for generating a wavelength converted laser beam comprising: a source of light; an external resonator; a pair of reflecting means provided at said external resonator; a nonlinear optical crystal provided in said external resonator and provided an incident laser beam from said source of light thereto; a moving means for moving at least one of said pair of reflecting means in an optical axis direction and making resonator length control; and wherein said moving means is supplied with a resonator length error signal due to a deviation between the length of said external resonator and that to said incident laser beam and with a reflected signal from said resonator as a result of reflection of said incident laser beam from said resonator as pulling-in signals for resonator length servo.
Claim 3
Dependent Claim
139 words
A laser beam generator for generating a wavelength converted laser beam comprising: a source of light; a resonator; a pair of reflecting means provided at said resonator; a nonlinear optical crystal provided in said resonator and provided an incident laser beam from said source of light thereto; a laser medium provided between said pair of reflecting means; a moving means for moving at least one of said pair of reflecting means in an optical axis direction and making resonator length control; and wherein said moving means is supplied with a resonator length error signal due to a deviation between the length of said resonator and that to said incident laser beam and with a reflected signal from said resonator as a result of reflection of said incident laser beam from said resonator as pulling-in signals for resonator length servo.
Claim 4
Dependent Claim
139 words
A laser beam generator for generating a wavelength converted laser beam comprising: a source of light; a resonator; a pair of reflecting means provided at said resonator; a nonlinear optical crystal provided in said resonator and provided an incident laser beam from said source of light thereto; a laser medium provided between said pair of reflecting means; a moving means for moving at least one of said pair of reflecting means in an optical axis direction and making resonator length control; and wherein said moving means is supplied with a resonator length error signal due to a deviation between the length of said resonator and that to said incident laser beam and with a reflected signal from said resonator as a result of reflection of said incident laser beam from said resonator as pulling-in signals for resonator length servo.
Claim 5
Dependent Claim
41 words
A laser beam generator according to claim 1, a zero-cross level of said resonator length error signal and a certain level or above of said reflected light signal are detected to user as said pulling-in signal for said resonator length servo.
Claim 6
Dependent Claim
41 words
A laser beam generator according to claim 2, a zero-cross level of said resonator length error signal and a certain level or above of said reflected light signal are detected to user as said pulling-in signal for said resonator length servo.
Claim 7
Dependent Claim
20 words
A laser beam generator according to claim 1, said resonator length error signal is generated by a synchronous detecting means.
Claim 8
Dependent Claim
20 words
A laser beam generator according to claim 2, said resonator length error signal is generated by a synchronous detecting means.
Claim 9
Dependent Claim
35 words
A laser beam generator according to claim 1, said moving means of said reflecting means is vibrated at a certain frequency so that said incident laser beam to said external resonator is modulated in phase.
Claim 10
Dependent Claim
35 words
A laser beam generator according to claim 2, said moving means of said reflecting means is vibrated at a certain frequency so that said incident laser beam to said external resonator is modulated in phase.
Claim 11
Dependent Claim
165 words
A laser beam generator for generating a wavelength converted laser beam comprising: a source of light; a external resonator; a pair of reflecting means provided at said external resonator; a nonlinear optical crystal provided in said resonator and provided an incident laser beam from said source of light thereto; a moving means for moving at least one of said pair of reflecting means in an optical axis direction and making resonator length control; and wherein said moving means is supplied with a resonator length error signal due to a deviation between the length of said external resonator and that to said incident laser beam and with a reflected signal from said resonator as a result of reflection of said incident later beam from said resonator for pulling-in resonator length servo when a zero-cross level of said error signal is detected during a certain time τ after said resonator length error signal is compared with a certain slice level so that a rising signal is detected.
Claim 12
Dependent Claim
165 words
A laser beam generator for generating a wavelength converted laser beam comprising: a source of light; a external resonator; a pair of reflecting means provided at said external resonator; a nonlinear optical crystal provided in said resonator and provided an incident laser beam from said source of light thereto; a moving means for moving at least one of said pair of reflecting means in an optical axis direction and making resonator length control; and wherein said moving means is supplied with a resonator length error signal due to a deviation between the length of said external resonator and that to said incident laser beam and with a reflected signal from said resonator as a result of reflection of said incident later beam from said resonator for pulling-in resonator length servo when a zero-cross level of said error signal is detected during a certain time τ after said resonator length error signal is compared with a certain slice level so that a rising signal is detected.
Claim 13
Dependent Claim
172 words
A laser beam generator for generating a wavelength converted laser beam comprising: a source of light; a resonator; a pair of reflecting means provided at said resonator; a nonlinear optical crystal provided in said resonator and provided an incident laser beam from said source of light thereto; a laser medium provided between said pair of reflecting means; a moving means for moving at least one of said pair of reflecting means in an optical axis direction and making resonator length control; and wherein said moving means is supplied with a resonator length error signal due to a deviation between the length of said resonator and that to said incident laser beam and with a reflected signal from said resonator as a result of reflection of said incident laser beam from said resonator for pulling-in resonator length servo when a zero-cross level of said error signal is detected during a certain time τ after said resonator length error signal is compared with a certain slice level so that a rising signal is detected.
Claim 14
Dependent Claim
172 words
A laser beam generator for generating a wavelength converted laser beam comprising: a source of light; a resonator; a pair of reflecting means provided at said resonator; a nonlinear optical crystal provided in said resonator and provided an incident laser beam from said source of light thereto; a laser medium provided between said pair of reflecting means; a moving means for moving at least one of said pair of reflecting means in an optical axis direction and making resonator length control; and wherein said moving means is supplied with a resonator length error signal due to a deviation between the length of said resonator and that to said incident laser beam and with a reflected signal from said resonator as a result of reflection of said incident laser beam from said resonator for pulling-in resonator length servo when a zero-cross level of said error signal is detected during a certain time τ after said resonator length error signal is compared with a certain slice level so that a rising signal is detected.
Claim 15
Dependent Claim
168 words
A laser beam generator for generating a wavelength converted laser beam comprising: a source of light; a external resonator; a pair of reflecting means provided at said resonator; a nonlinear optical crystal provided in said resonator and provided an incident laser beam from said source of light thereto, said incident laser beam of a frequency fc modulated in phase by a frequency fm to produce a phase-modulated signal; a clock signal generated from said phase-modulated signal and used to sample and hold said phase-modulated signal; a moving means for moving at least one of said pair of reflecting means in an optical axis direction and making resonator length control; and wherein said moving means is supplied with a resonator length error signal due to a deviation between the length of said external resonator and that to said incident laser beam and with a reflected signal from said resonator as a result of reflection of said incident laser beam from said resonator as pulling-in signals for resonator length servo.
Claim 16
Dependent Claim
168 words
A laser beam generator for generating a wavelength converted laser beam comprising: a source of light; a external resonator; a pair of reflecting means provided at said resonator; a nonlinear optical crystal provided in said resonator and provided an incident laser beam from said source of light thereto, said incident laser beam of a frequency fc modulated in phase by a frequency fm to produce a phase-modulated signal; a clock signal generated from said phase-modulated signal and used to sample and hold said phase-modulated signal; a moving means for moving at least one of said pair of reflecting means in an optical axis direction and making resonator length control; and wherein said moving means is supplied with a resonator length error signal due to a deviation between the length of said external resonator and that to said incident laser beam and with a reflected signal from said resonator as a result of reflection of said incident laser beam from said resonator as pulling-in signals for resonator length servo.
Claim 17
Dependent Claim
176 words
A laser beam generator for generating a wavelength converted laser beam comprising: a source of light; a resonator; a pair of reflecting means provided at said resonator; a nonlinear optical crystal provided in said resonator and provided an incident laser beam from said source of light thereto; said incident laser beam of a frequency fc modulated in phaser by a frequency fm to produce a phase-modulated signal; a clock signal generated from said phase-modulated signal and used to sample and hold said phase-modulated signal; a laser medium provided between said pair of reflecting means; a moving means for moving at least one of said pair of reflecting means in an optical axis direction and making resonator length control; and wherein said moving means is supplied with a resonator length error signal due to a deviation between the length of said resonator and that to said incident laser beam and with a reflected signal from said resonator as a result of reflection of said incident laser beam from said resonator as pulling-in signals for resonator length servo.
Claim 18
Dependent Claim
176 words
A laser beam generator for generating a wavelength converted laser beam comprising: a source of light; a resonator; a pair of reflecting means provided at said resonator; a nonlinear optical crystal provided in said resonator and provided an incident laser beam from said source of light thereto; said incident laser beam of a frequency fc modulated in phaser by a frequency fm to produce a phase-modulated signal; a clock signal generated from said phase-modulated signal and used to sample and hold said phase-modulated signal; a laser medium provided between said pair of reflecting means; a moving means for moving at least one of said pair of reflecting means in an optical axis direction and making resonator length control; and wherein said moving means is supplied with a resonator length error signal due to a deviation between the length of said resonator and that to said incident laser beam and with a reflected signal from said resonator as a result of reflection of said incident laser beam from said resonator as pulling-in signals for resonator length servo.
Claim 19
Dependent Claim
16 words
A laser beam generator according to claim 5 wherein said synchronous detecting means is sample-and-hold means.
Claim 20
Dependent Claim
16 words
A laser beam generator according to claim 6 wherein said synchronous detecting means is sample-and-hold means.
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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) | 1997-08-15 | 1998-02-14 | 1998-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-08-15 | 2002-02-14 | 2002-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-08-15 | 2006-02-14 | 2006-08-16 | $7700.00 | Window Closed / Lapsed |