Patent US4856006A successfully refreshed from Google Patents.
US4856006A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Higher harmonic generating device
Assignee: Sharp Corp
•
Filing: 1987-08-11
•
Granted: 1989-08-08
•
Expires: 2007-08-11
Abstract
Abstract A semiconductor harmonic generating device comprising a nonlinear medium and a waveguide which is provided in the upper face of the nonlinear medium. A higher harmonic laser light from a fundamental wave laser light which passes through the waveguide, wherein the waveguide has refractive index dispersion means for counterbalancing the refractive index difference caused by wavelength dispersion, occurring in the nonlinear medium, between the fundamental wave laser light and the higher harmonic laser light.
Inventors
- 👤 Seiki Yano
- 👤 Toshiki Hijikata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:06
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/35; G02F1/37; G02F1/377
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
115 words
A higher harmonic generating device for developing a higher harmonic laser light corresponding to a first refractive index friom an incident fundamental wave laser light corresponding to a second refractive index comprising: nonlinear medium means for receiving the incident fundamental wave laser light; waveguide means disposed within said nonlinear medium means for developing the higher harmonic laser light in response to the incident fundamental wave laser light; and diffraction grating means formed directly in said waveguide means for counterbalancing a difference between the first refractive index and the second refractive index and wavelength dispersion resulting from said difference, thereby generating matching phases of the higher harmonic laser light and the incident fundamental wave laser light.
Claim 2
Dependent Claim
115 words
A higher harmonic generating device for developing a higher harmonic laser light corresponding to a first refractive index friom an incident fundamental wave laser light corresponding to a second refractive index comprising: nonlinear medium means for receiving the incident fundamental wave laser light; waveguide means disposed within said nonlinear medium means for developing the higher harmonic laser light in response to the incident fundamental wave laser light; and diffraction grating means formed directly in said waveguide means for counterbalancing a difference between the first refractive index and the second refractive index and wavelength dispersion resulting from said difference, thereby generating matching phases of the higher harmonic laser light and the incident fundamental wave laser light.
Claim 3
Dependent Claim
18 words
A higher harmonic generating device according to claim 1, wherein said nonlinear medium means comprises LiNbO 3 .
Claim 4
Dependent Claim
37 words
A higher harmonic generating device according to claim 1, wherein an upper surface of said waveguide means comprises a plurality of projections which are located in the direction of a crystallographic axis of said nonlinear medium means.
Claim 5
Dependent Claim
28 words
A higher harmonic generating device according to claim 3, wherein said plurality of projections are formed in the direction of said crystallographic axis of said nonlinear medium means.
Claim 6
Dependent Claim
19 words
A higher harmonic generating device according to claim 3, wherein said plurality of projections have a predetermined pitch length.
Claim 7
Dependent Claim
37 words
A higher harmonic generating device according to claim 5, wherein said predetermined pitch length of said diffraction grating means is substantially equal to a wavelength of said incident fundamental wave laser light, for developing a Bragg condition.
Claim 8
Dependent Claim
32 words
A higher harmonic generating device according to claim 3, wherein said waveguide means comprises Ti which is diffused into said nonlinear medium means along a crystallographic axis of said nonlinear medium means.
Claim 9
Dependent Claim
21 words
A higher harmonic generating device according to claim 1, wherein said nonlinear medium means is formed in a rectangular parallelopiped shape.
References Cited (Backward Citations)
US3619795A
Cited
US3619796A
Cited
US3700912A
Cited
US3832567A
Cited
US3822927A
Cited
US4039249A
Cited
US3884549A
Cited
US3873825A
Cited
US3842289A
Cited
US3863063A
Cited
US3891302A
Cited
US3939439A
Cited
US4382660A
Cited
US4227769A
Cited
US4250465A
Cited
US4427260A
Cited
US4493086A
Cited
US4655547A
Cited
US4673257A
Cited
JPH0617727A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-08-07 | 1993-02-06 | 1993-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-07 | 1997-02-06 | 1997-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-07 | 2001-02-06 | 2001-08-08 | $7700.00 | Window Closed / Lapsed |