US3930731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laser gyroscope
Assignee: Raytheon Co
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Filing: 1974-02-11
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Granted: 1976-01-06
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Expires: 1994-02-11
Abstract
Abstract A laser gyroscope is disclosed wherein a polarization dispersive structure, disposed in the path of the laser beam, includes an anisotropic crystal as a half-wave retarder. The crystallographic axes of such crystal are oriented with respect to the plane of the path to produce different delays to oppositely polarized waves passing through the crystal structure.
Inventors
- 👤 Keimpe Andringa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:26
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/02; H01S3/03; H01S3/032; H01S3/0323; G; G01; G01C; G01C19/00; G01C19/58; G01C19/64; G01C19/66; G01C19/667; H01S3/0315; H01S3/05; H01S3/06; H01S3/07; H01S3/073; H01S3/076
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
100 words
In combination: a. means for directing a first pair of oppositely polarized laser waves through a laser medium in a first direction and a second pair of oppositely polarized laser waves through said laser medium in a direction opposite to such first direction, each of such polarized waves having a different frequency; and, b. a polarization dispersive structure disposed in the path of the two pairs of waves comprising: an anisotropic crystal the crystallographic axes of such crystal being oriented to produce different delays to the oppositely sensed polarized laser waves passing therethrough, such delays being related to such orientation.
Claim 2
Dependent Claim
100 words
In combination: a. means for directing a first pair of oppositely polarized laser waves through a laser medium in a first direction and a second pair of oppositely polarized laser waves through said laser medium in a direction opposite to such first direction, each of such polarized waves having a different frequency; and, b. a polarization dispersive structure disposed in the path of the two pairs of waves comprising: an anisotropic crystal the crystallographic axes of such crystal being oriented to produce different delays to the oppositely sensed polarized laser waves passing therethrough, such delays being related to such orientation.
Claim 3
Dependent Claim
12 words
The combination recited in claim 2 wherein the waves have circular polarization.
Claim 4
Dependent Claim
14 words
The combination recited in claim 2 wherein the anisotropic crystal includes a half-wave retarder.
Claim 5
Dependent Claim
108 words
In combination: a. means for directing a first pair of oppositely polarized laser waves through a laser medium in a first direction and a second pair of oppositely polarized laser waves through said laser medium in a direction opposite to such first direction, each one of such waves having a different frequency; and b. polarization dispersive means disposed in the path of such waves, such means including an anisotropic crystal and means for positioning such crystal in a predetermined orientation to enable the frequencies of the first pair of oppositely polarized laser waves to be positioned between the frequencies of the second pair of oppositely polarized laser waves.
Claim 6
Dependent Claim
108 words
In combination: a. means for directing a first pair of oppositely polarized laser waves through a laser medium in a first direction and a second pair of oppositely polarized laser waves through said laser medium in a direction opposite to such first direction, each one of such waves having a different frequency; and b. polarization dispersive means disposed in the path of such waves, such means including an anisotropic crystal and means for positioning such crystal in a predetermined orientation to enable the frequencies of the first pair of oppositely polarized laser waves to be positioned between the frequencies of the second pair of oppositely polarized laser waves.
Claim 7
Dependent Claim
25 words
The combination recited in claim 4 including means for orienting the crystallographic axis of such crystal to produce different delays between the pair of waves.
Claim 8
Dependent Claim
21 words
The combination recited in claim 5 wherein the path of the laser waves is bounded by an odd number of reflectors.
Claim 9
Dependent Claim
26 words
The combination recited in claim 5 including a second anisotropic crystal wherein the path of the laser waves is bounded by an even number of reflectors.
Claim 10
Dependent Claim
14 words
The combination recited in claim 4 wherein the anisotropic crystal is a half-wave retarder.
Claim 11
Dependent Claim
14 words
The combination recited in claim 6 wherein the anisotropic crystal is a half-wave retarder.
Claim 12
Dependent Claim
17 words
The combination recited in claim 7 wherein each one of the anisotropic crystals is a half-wave retarder.
Claim 13
Dependent Claim
49 words
The combination recited in claim 1 wherein the polarization dispersive structure comprises means for positioning such crystal in a predetermined orientation to enable the frequencies of the first pair of oppositely polarized laser waves to be positioned between the frequencies of the second pair of oppositely polarized laser waves.
Claim 14
Dependent Claim
39 words
The combination recited in claim 11 including means for maintaining the frequencies of the first pair of oppositely polarized laser waves and the frequencies of the second pair of oppositely polarized laser waves disposed symmetrically about a predetermined frequency.
Claim 15
Dependent Claim
39 words
The combination recited in claim 4 including means for maintaining the frequencies of the first pair of oppositely polarized laser waves and the frequencies of the second pair of oppositely polarized laser waves disposed symmetrically about a predetermined frequency.
Claim 16
Dependent Claim
79 words
In a laser gyroscope having a polarization dispersive structure for enabling two pairs of oppositely polarized laser waves to pass through a laser medium in opposite directions, such structure comprising: An anisotropic crystal disposed in the path of the waves; and, means for adjusting the orientation of the crystal to enable the frequencies of one of the pairs of waves to be positioned between the frequencies of the other one of the pairs of waves in said laser gyroscope.
Claim 17
Dependent Claim
79 words
In a laser gyroscope having a polarization dispersive structure for enabling two pairs of oppositely polarized laser waves to pass through a laser medium in opposite directions, such structure comprising: An anisotropic crystal disposed in the path of the waves; and, means for adjusting the orientation of the crystal to enable the frequencies of one of the pairs of waves to be positioned between the frequencies of the other one of the pairs of waves in said laser gyroscope.
References Cited (Backward Citations)
US3596201A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-05 | 1979-07-07 | 1980-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-05 | 1983-07-07 | 1984-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-05 | 1987-07-07 | 1988-01-06 | $7700.00 | Window Closed / Lapsed |