US3958863A
Expired / Lapsed
US
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Tl3 TaS4 and Tl3 TaSe4 crystals and acousto-optical devices
Assignee: Westinghouse Electric Corp
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Filing: 1975-01-10
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Granted: 1976-05-25
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Expires: 1995-01-10
Abstract
Abstract Single crystals of Tl 3 TaS 4 and Tl 3 TaSe 4 are disclosed which have useful acousto-optical properties, including low acoustic velocities and high acousto-optical figures of merit. They are used in acousto-optical devices such as a display device, a laser modulator, a non-collinear tunable filter, an acousto-optical delay line, and an acousto-optical waveguide modulator.
Inventors
- 👤 Thelma J. Isaacs
- 👤 Milton Gottlieb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:33
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/11; H; H03; H03H; H03H9/00; H03H9/30; H01; H01S; H01S3/00; H01S3/10; H01S3/106; H01S3/1068
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
34 words
A single crystal selected from the group consisting of Tl 3 TaS 4 , Tl 3 TaSe 4 , and mixtures thereof, within ± 5% of stoichiometric, which is at least 3 mm long.
Claim 2
Dependent Claim
34 words
A single crystal selected from the group consisting of Tl 3 TaS 4 , Tl 3 TaSe 4 , and mixtures thereof, within ± 5% of stoichiometric, which is at least 3 mm long.
Claim 3
Dependent Claim
17 words
A single crystal according to claim 1 wherein said single crystal is Tl 3 TaS 4 .
Claim 4
Dependent Claim
17 words
A single crystal according to claim 1 wherein said single crystal is Tl 3 TaSe 4 .
Claim 5
Dependent Claim
11 words
A crystal according to claim 1 having two parallel optical faces.
Claim 6
Dependent Claim
21 words
A single crystal according to claim 1 at least about 1/2 cm in diameter and at least about 1 cm long.
Claim 7
Dependent Claim
28 words
A single crystal according to claim 1 at least about 0.4 to about 100 μ m thick fixed to the surface of a substrate of lower refractive index.
Claim 8
Dependent Claim
37 words
A crystal according to claim 6 which is doped with about 10 to about 100 ppm of a dopant selected from the group consisting of vanadium, selenium, and mixtures thereof and said substrate is said crystal undoped.
Claim 9
Dependent Claim
33 words
A method of diffracting light in a crystal according to claim 1 comprising generating a sound wave in said crystal the wave fronts of which are at a diffracting angle to said light.
Claim 10
Dependent Claim
62 words
An acousto-optical system comprising: 1. a crystal according to claim 1; 2. means for generating a sound wave in said crystal; 3. means for propagating light in said crystal having a wavelength within the transparency range of said crystal at a diffracting angle to said sound wave; and 4. means for detecting at least part of said light after it is diffracted.
Claim 11
Dependent Claim
35 words
An acoustic delay line comprising: 1. a crystal according to claim 1; 2. means for generating sound waves in said crystal; and 3. means for detecting said sound waves after they have traversed said crystal.
Claim 12
Dependent Claim
28 words
A method of diffracting light in a crystal according to claim 6 comprising generating a surface acoustic wave in said crystal at a diffracting angle to said light.
Claim 13
Dependent Claim
39 words
A method according to claim 11 wherein said crystal is doped with about 10 to about 100 ppm of a dopant selected from the group consisting of vanadium, selenium, and mixtures thereof and said substrate is said crystal undoped.
Claim 14
Dependent Claim
33 words
An acousto-optical system according to claim 9 including means for generating a second sound wave perpendicular to the first sound wave, and including a viewing screen which is irradiated by said diffracted light.
Claim 15
Dependent Claim
16 words
An acousto-optical system according to claim 13 wherein said sound waves are in the Bragg mode.
Claim 16
Dependent Claim
14 words
An acousto-optical system according to claim 13 wherein said light is polarized and coherent.
Claim 17
Dependent Claim
34 words
An acousto-optical system according to claim 9 wherein the source of said light is a laser which comprises a lasing medium positioned between two opposing mirrors, one partially reflecting and the other totally reflecting.
Claim 18
Dependent Claim
17 words
An acousto-optical system according to claim 16 wherein said single crystal is positioned external to said laser.
Claim 19
Dependent Claim
22 words
An acousto-optical system according to claim 16 wherein said single crystal is positioned between said lasing medium and one of said mirrors.
Claim 20
Dependent Claim
39 words
An acousto-optical system according to claim 9 wherein said single crystal is a rectangle, said sound waves move the length of said rectangle, and said light wave is incident to the face of said rectangle at a non-normal angle.
Claim 21
Dependent Claim
17 words
An acousto-optical system according to claim 9 wherein said single crystal is Tl 3 TaS 4 .
Claim 22
Dependent Claim
17 words
An acousto-optical system according to claim 9 wherein said single crystal is Tl 3 TaSe 4 .
Claim 23
Dependent Claim
12 words
An acousto-optical system according to claim 9 having two parallel optical faces.
Claim 24
Dependent Claim
26 words
An acousto-optical system according to claim 9 wherein said single crystal is at least about 1/2 cm in diameter and at least about 1 cm long.
Claim 25
Dependent Claim
32 words
An acousto-optical system according to claim 9 wherein said single crystal is at least about 0.4 to about 100 m thick fixed to the surface of a substrate of lower refractive index.
Claim 26
Dependent Claim
41 words
An acousto-optical system according to claim 24 wherein said single crystal is doped with about 10 to about 100 ppm of a dopant selected from the group consisting of vanadium, selenium, and mixtures thereof and said substrate is said crystal undoped.
Claim 27
Dependent Claim
15 words
An acousto-optical system according to claim 25 wherein said sound wave is a surface wave.
References Cited (Backward Citations)
US3746866A
Cited
US3799659A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-05-25 | 1979-11-24 | 1980-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-25 | 1983-11-24 | 1984-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-25 | 1987-11-24 | 1988-05-25 | $7700.00 | Window Closed / Lapsed |