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US4973118A
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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: 1990-11-27
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Expires: 2009-12-19
Abstract
Abstract A second harmonic wave generating device of a thin film waveguide structure having a high conversion efficiency, which satisfies the following equation: ##EQU1## wherein, λμm: fundamental wavelength Tμm: thickness of the thin film waveguide layer n OS1 : ordinary refractive index of the substrate at the fundamental wavelength N OF1 : ordinary refractive index of the thin film waveguide layer at the fundamental wavelength N eS2 : extraordinary refractive index of the substrate at the second harmonic wavelength n eF2 : extraordinary refractive index of the thin film waveguide layer at the second harmonic wavelength ##EQU2##
Inventors
- 👤 Ryo Enomoto
- 👤 Masaya Yamada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:49
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/35; G02F1/37; G02F1/377; G02F1/355; G02F1/3551
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
115 words
A second harmonic wave generating device comprising a thin film waveguide layer formed on a substrate, characterized in that a fundamental wavelength (λμm), a thickness (Tμm) of said thin film waveguide layer, an ordinary refractive index (noS1) of said substrate at said fundamental wavelength (λμm), an ordinary refractive index (noF1) of said thin film waveguide layer at said fundamental wavelength (λμm), an extraordinary refractive index (neS2) of said substrate at a second harmonic wavelength (λμm/2), and an extraordinary refractive index (neF2) of said thin film waveguide layer at said second harmonic wavelength (λμm/2) are represented by an equation, ##EQU15## wherein, N 1 in Equation (A) is ##EQU16## and N 2 in Equation (B) is ##EQU17##
Claim 2
Dependent Claim
115 words
A second harmonic wave generating device comprising a thin film waveguide layer formed on a substrate, characterized in that a fundamental wavelength (λμm), a thickness (Tμm) of said thin film waveguide layer, an ordinary refractive index (noS1) of said substrate at said fundamental wavelength (λμm), an ordinary refractive index (noF1) of said thin film waveguide layer at said fundamental wavelength (λμm), an extraordinary refractive index (neS2) of said substrate at a second harmonic wavelength (λμm/2), and an extraordinary refractive index (neF2) of said thin film waveguide layer at said second harmonic wavelength (λμm/2) are represented by an equation, ##EQU15## wherein, N 1 in Equation (A) is ##EQU16## and N 2 in Equation (B) is ##EQU17##
Claim 3
Dependent Claim
33 words
The second harmonic wave generating device as claimed in claim 1 wherein incident angle (θ) of the fundamental wave to the optical axis (Z-axis) of saidthin film waveguide layer is 0±15° or 90±15°.
Claim 4
Dependent Claim
21 words
The second harmonic wave generating device as claimed in claim 1 wherein said fundamental wavelength (λμm) is 0.4 to 1.6 μm.
Claim 5
Dependent Claim
26 words
The second harmonic wave generating device as claimed in claim 1 wherein said thin film waveguide layer has a thickness (T) of 0.1 to 20 μm.
Claim 6
Dependent Claim
155 words
The second harmonic wave generating device as claimed in claim 1 wherein said film waveguide layer is made of a material selected from the group consisting of LiNbO 3 , Ba 2 Na Nd 5 O 15 , K 2 LiNd 5 O 15 , Ba 2 LiNb 5 O 15 , Sr 1-x Ba x Nb 2 O 6 (SBN), α-quartz, KTiOPO 4 (KTP), β-BaB 2 O 4 (BBO), KB 5 O 8 .4H 2 O (KB 5 ), KH 2 PO 4 (KDP), KD 2 PO 4 (KD*), NH 4 H 2 PO 4 (ADP), C 5 H 2 AsO 4 (CDA), C 5 D 2 AsO 4 (CD*A), RbH 2 PO 4 (RDP), RbH 2 AsO 4 (RDA), BeSO 4 .4H 2 O, LiClO 4 ,3H 2 O, LiIO 3 , α-LiCdBO 3 , LiB 3 O 5 (LBO), urea, poly-p-nitroaniline (p-PNA), poly-diacetylene (DCH), 4-(N,N-dimethylamino)-3-acetamidonitrobenzene (DAN), 4-nitrobenzaldehyde-hydrazine (NBAH), 3-methoxy-4-nitrobenzaldehyde-hydrazine, and 2-methyl-4-nitroaniline (MNA).
Claim 7
Dependent Claim
68 words
The second harmonic wave generating device as claimed in claim 1 wherein said substrate is made of a material selected from the group consisting of LiTaO 3 , MgO, Gd 3 Ga 5 O 15 (GGG), Nd 3 Ga 5 O 12 (NdGG), Sm 3 Ga 5 O 15 (SmGG), SiO 2 , alumina, KTP, BBO, LBO, KDP, and the like, soda glass, borosilicate glass, and polymethylmethacrylate (PMMA).
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)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-11-26 | 1994-05-28 | 1994-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-11-26 | 1998-05-28 | 1998-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-11-26 | 2002-05-28 | 2002-11-27 | $7700.00 | Window Closed / Lapsed |