US4953931A
Expired / Lapsed
US
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Second harmonic wave generating device
Assignee: Ibiden Co Ltd
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Filing: 1989-12-19
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Granted: 1990-09-04
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Expires: 2009-12-19
Abstract
Abstract A second harmonic wave generating device comprising a LiNbO 3 thin film waveguide layer formed on a LiTaO 3 substrate, in which the LiTaO 3 substrate has an ordinary refractive index (n oS1 ) of 2.10 to 2.20 at the fundamental wavelength (λμm) and an extraordinary refractive index (n eS2 ) of 2.22 to 2.28 at the second harmonic wavelength (λμm/2), and the ordinary refractive index (n oF1 ) at the fundamental wavelength (λμm) of the LinBO 3 thin film waveguide layer, the extraordinary refractive index (n eS2 ) at the second harmonic wavelength (λμm/2) of the LiTaO 3 substrate, and the extraordinary refractive index (n eF2 ) at the second harmonic wavelength (λμm/2) of the LiNbO 3 thin film waveguide layer have the relation ##EQU1##
Inventors
- 👤 Yasumitsu Miyazaki
- 👤 Ryo Enomoto
- 👤 Masaya Yamada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:53
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/35; G02F1/37; G02F1/377
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
127 words
A second harmonic wave generating device comprising a LiNbO 3 thin film waveguide layer formed on a LiTaO 3 substrate, characterized in that said LiTaO 3 substrate has an ordinary refractive index (n oS1 ) of 2.10 to 2.20 at a fundamental wavelength (λμm) and an extraordinary refractive index (n eS2 ) of 2.22 to 2.28 at a second harmonic wavelength (λμm/2), and an ordinary refractive index (n oF1 ) at said fundamental wavelength (λμm) of said LiNbO 3 thin film waveguide layer, an extraordinary refractive index (n eS2 ) at said second harmonic wavelength (λμm/2) of said LiTaO 3 substrate, and an extraordinary refractive index (n eF2 ) at said second harmonic wavelength (λμm/2) of said LiNbO 3 thin film waveguide layer have a relation ##EQU12##
Claim 2
Dependent Claim
127 words
A second harmonic wave generating device comprising a LiNbO 3 thin film waveguide layer formed on a LiTaO 3 substrate, characterized in that said LiTaO 3 substrate has an ordinary refractive index (n oS1 ) of 2.10 to 2.20 at a fundamental wavelength (λμm) and an extraordinary refractive index (n eS2 ) of 2.22 to 2.28 at a second harmonic wavelength (λμm/2), and an ordinary refractive index (n oF1 ) at said fundamental wavelength (λμm) of said LiNbO 3 thin film waveguide layer, an extraordinary refractive index (n eS2 ) at said second harmonic wavelength (λμm/2) of said LiTaO 3 substrate, and an extraordinary refractive index (n eF2 ) at said second harmonic wavelength (λμm/2) of said LiNbO 3 thin film waveguide layer have a relation ##EQU12##
Claim 3
Dependent Claim
27 words
The second harmonic wave generating device as claimed in claim 1 wherein said LiNbO 3 thin film waveguide layer has a thickness of 0.3 to 16 μm.
Claim 4
Dependent Claim
34 words
The second harmonic wave generating device as claimed in claim 2 wherein incident angle (θ) of said fundamental wave to the optical axis (Z-axis) of said thin film waveguide layer is 0°±15° or 90°±15°.
Claim 5
Dependent Claim
21 words
The second harmonic wave generating device as claimed in claim 1 wherein said fundamental wavelength (λ) is 0.68 to 0.94 μm.
Claim 6
Dependent Claim
21 words
The second harmonic wave generating device as claimed in claim 1 wherein said LiTaO 3 substrate is a single crystal substrate.
Claim 7
Dependent Claim
43 words
The second harmonic wave generating device as claimed in claim 1 wherein said LiNbO 3 thin film waveguide layer and said LiTaO 3 substrate contain one or more different elements selected from the group consisting of Na, Cr, Mg, Nd, Ti, and V.
Claim 8
Dependent Claim
23 words
The second harmonic wave generating device as claimed in claim 1 of a channel type having a width of 1 to 10 μm.
References Cited (Backward Citations)
US4778234A
Cited
US4775206A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-09-03 | 1994-03-05 | 1994-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-03 | 1998-03-05 | 1998-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-03 | 2002-03-05 | 2002-09-04 | $7700.00 | Window Closed / Lapsed |