Patent US5130998A successfully refreshed from Google Patents.
US5130998A
Expired / Lapsed
US
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Laser device with oscillation wavelength control
Assignee: Mitsubishi Electric Corp
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Filing: 1991-02-20
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Granted: 1992-07-14
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Expires: 2011-02-20
Abstract
Abstract Laser devices including a rough and a fine adjustment etalons are controlled for wavelength stabilization. Further, a power monitoring mechanism may be provided for measuring the output power of the laser beam, and the rough adjustment etalon is selectively controlled in response to the power monitoring mechanism or to the calculation means. Alternatively, a separate light source oscillating at a wavelength different from the oscillation wavelength of the laser resonator emits light which is split into two parts by a beam splitter. The beams of light emitted from the light source and reflected by the rough adjustment etalon are received by a pair of photosensors, and the rough adjustment etalon is controlled so as to minimize the differential output of the two photosensors.
Inventors
- 👤 Hitoshi Wakata
- 👤 Atsushi Sugitatsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:34
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/10; H01S3/13; H01S3/136; H01S3/137; H01S3/14; H01S3/22; H01S3/223; H01S3/225
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
166 words
A laser device comprising: a laser resonator including a first and a second etalon having distinct transmission bandwidths, wherein a transmission bandwidth of the first etalon is narrower than a transmission bandwidth of the second etalon; measurement means for measuring an oscillation wavelength of a laser beam outputted from said laser resonator; first control means, coupled to an output of said measurement means, for controlling the transmission wavelength of the first etalon such that the oscillation wavelength of the laser beam detected by the measurement means is adjusted to a predetermined wavelength; calculation means, coupled to an output of said measurement means, for calculating a shift of the transmission wavelength of the second etalon in response to a measurement of the oscillation wavelength of the laser beam effected by the measurement means; and second control means, coupled to an output of the calculation means, for controlling the transmission wavelength of the second etalon to the predetermined wavelength in response to the output of the calculation means.
Claim 2
Dependent Claim
166 words
A laser device comprising: a laser resonator including a first and a second etalon having distinct transmission bandwidths, wherein a transmission bandwidth of the first etalon is narrower than a transmission bandwidth of the second etalon; measurement means for measuring an oscillation wavelength of a laser beam outputted from said laser resonator; first control means, coupled to an output of said measurement means, for controlling the transmission wavelength of the first etalon such that the oscillation wavelength of the laser beam detected by the measurement means is adjusted to a predetermined wavelength; calculation means, coupled to an output of said measurement means, for calculating a shift of the transmission wavelength of the second etalon in response to a measurement of the oscillation wavelength of the laser beam effected by the measurement means; and second control means, coupled to an output of the calculation means, for controlling the transmission wavelength of the second etalon to the predetermined wavelength in response to the output of the calculation means.
Claim 3
Dependent Claim
73 words
A laser device as claimed in claim 1, further comprising: a power monitoring means for measuring the output power of the laser beam outputted from the laser resonator; and selection control means for selectively supplying outputs of the calculation means and the power monitoring means to said second control means, said second control means controlling the second etalon in response to the selected output of the calculation means and the power monitoring means.
Claim 4
Dependent Claim
107 words
A laser device comprising: a laser resonator including a first and a second etalon having distinct transmission bandwidths, wherein a transmission bandwidth of the first etalon is narrower than a transmission bandwidth of the second etalon; a light source emitting light on at least one of said etalons; photosensor means for detecting an intensity of light emitted from said light source and reflected by said one of the etalons; and control means, coupled to an output of said photosensor means, for controlling the transmission wavelength of said one of the etalons to a predetermined wavelength in response to the intensity of light detected by said photosensor means.
Claim 5
Dependent Claim
107 words
A laser device comprising: a laser resonator including a first and a second etalon having distinct transmission bandwidths, wherein a transmission bandwidth of the first etalon is narrower than a transmission bandwidth of the second etalon; a light source emitting light on at least one of said etalons; photosensor means for detecting an intensity of light emitted from said light source and reflected by said one of the etalons; and control means, coupled to an output of said photosensor means, for controlling the transmission wavelength of said one of the etalons to a predetermined wavelength in response to the intensity of light detected by said photosensor means.
Claim 6
Dependent Claim
59 words
A laser device as claimed in claim 3, wherein said light source emits light at a wavelength different from an oscillation wavelength of a laser beam outputted from the laser resonator, said light source emitting light to said one of the etalons along an optical axis of said laser resonator via a totally reflective mirror of said laser resonator.
Claim 7
Dependent Claim
18 words
A laser device as claimed in claim 4, wherein said one of the etalons is said second etalon.
Claim 8
Dependent Claim
100 words
A laser device as claimed in claim 5, further comprising: dividing means for dividing the light emitted from the light source into two parts, and wherein said photosensor means comprises a first and a second photosensor for receiving the two divided parts of the light reflected by said second etalon, wherein a difference between outputs of said first and second photosensor vanishes when the transmission wavelength of said second etalon is adjusted to the predetermined wavelength, said control means controlling said second etalon so as to reduce the difference of the outputs of the first and second photosensor to zero.
Claim 9
Dependent Claim
30 words
A laser device as claimed in claim 6, wherein said dividing means comprises a beam splitter disposed between the light source and the totally reflective mirror of the laser resonator.
Claim 10
Dependent Claim
101 words
A laser device as claimed in claim 5, further comprising: diverging means for diverging the light emitted from the light source into two parts, and wherein said photosensor means comprises a first and a second photosensor for receiving the two diverged parts of the light reflected by said second etalon, wherein a difference between outputs of said first and second photosensor vanishes when the transmission wavelength of said second etalon is adjusted to the predetermined wavelength, said control means controlling said second etalon so as to reduce the difference of the outputs of the first and the second photosensor to zero.
Claim 11
Dependent Claim
30 words
A laser device as claimed in claim 8, wherein said diverging means comprises a concave lens disposed between the light source and the totally reflective mirror of the laser resonator.
References Cited (Backward Citations)
US4839614A
Cited
US4975919A
Cited
US4914662A
Cited
US4977563A
Cited
JPH01205488A
Cited
US4947398A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-07-14 | 1996-01-13 | 1996-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-07-14 | 2000-01-13 | 2000-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-07-14 | 2004-01-13 | 2004-07-14 | $7700.00 | Window Closed / Lapsed |