US4930132A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Second harmonic wave generating device having active layer and second harmonic wave generating layer on same substrate
Assignee: Canon Inc
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Filing: 1988-12-22
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Granted: 1990-05-29
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Expires: 2008-12-22
Abstract
Abstract A second harmonic wave generating device comprises: a substrate; an active layer formed on said substrate and adapted for generating light of a wavelength λ in response to the injection of a current; a layer of a second harmonic wave generating material formed on the substrate and adapted for generating light of a wavelength λ/2 from the light generated in the active layer; and a pair of electrodes for supplying the active layer with a current.
Inventors
- 👤 Akira Shimizu
- 👤 Sotomitsu Ikeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 01:11
CPC Classifications
H; H01; H01S; H01S5/00; H01S5/10; H01S5/1028; H01S5/12; H01S5/005; H01S5/0092; H01S5/02; H01S5/028; H01S5/04; H01S5/042; H01S5/0421; H01S5/0422; H01S5/0424; H01S5/06; H01S5/0604; H01S5/1032; H01S5/1035; H01S5/20; H01S5/22; H01S5/223; H01S5/2231; H01S5/227; H01S5/2275
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
65 words
A second harmonic wave generating device comprising: a substrate; an active layer on said substrate for generating light of a wavelength λ in response to injection of a current; a layer of a material on said substrate for generating light of a wavelength λ/2 from the light generated in said active layer; and a pair of electrodes for supplying said active layer with a current.
Claim 2
Dependent Claim
65 words
A second harmonic wave generating device comprising: a substrate; an active layer on said substrate for generating light of a wavelength λ in response to injection of a current; a layer of a material on said substrate for generating light of a wavelength λ/2 from the light generated in said active layer; and a pair of electrodes for supplying said active layer with a current.
Claim 3
Dependent Claim
33 words
A device according to claim 1, further comprising means on said active layer for causing oscillation within said active layer, said oscillation means and said active layer in combination forming a laser oscillator.
Claim 4
Dependent Claim
51 words
A device according to claim 2, wherein said oscillation means includes a pair of end faces bracketing said active layer, wherein said end faces are provided with a coating for confining the light of said wavelength λ within said active layer and taking the light of wavelength λ/2 from the device.
Claim 5
Dependent Claim
82 words
A device according to claim 2, wherein said active layer is formed in a stripe shape extended in a direction of oscillation of the confined light, and a layer of said material is positioned on each of two opposing sides of the active layer, in a second direction perpendicular to the direction of oscillation and in a position substantially the same as that of the active layer in a third direction perpendicular to both the direction of oscillation and the second direction.
Claim 6
Dependent Claim
35 words
A device according to claim 2, further comprising a clad layer formed on said active layer and provided with a ridge portion, extended, in stripe form, in a direction of oscillation of said laser oscillator.
Claim 7
Dependent Claim
62 words
A device according to claim 5, wherein a layer of said material is positioned on each of two opposing sides of the ridge portion, in a second direction perpendicular to the direction of oscillation and in a position substantially the same as that of said ridge portion in a third direction perpendicular to both the direction of oscillation and the second direction.
Claim 8
Dependent Claim
26 words
A device according to claim 5, wherein a part of said ridge portion in the direction of oscillation is replaced by a layer of said material.
Claim 9
Dependent Claim
62 words
A device according to claim 1, wherein said active layer and said layer of material are laminated on the substrate, and further comprising a first diffraction grating for diffracting the light of wavelength λ generated in said active layer toward the layer of material as diffracted light, and a second diffraction grating for coupling the diffracted light within the layer of material.
Claim 10
Dependent Claim
48 words
A device according to claim 8, wherein the pitch Λ 1 of said first diffraction grating satisfies: Λ.sub.1 =l·(λ/2n) in which n is the effective refractive index for the light of wavelength λ at said diffraction grating, and l is an integer equal to or larger than 1.
Claim 11
Dependent Claim
39 words
A device according to claim 9, wherein the pitch Λ 2 of said second diffraction grating satisfies a relation: Λ.sub.2 =l·(λ/2n') in which n' is the effective refractive index for the light of wavelength λ at said diffraction grating.
Claim 12
Dependent Claim
47 words
A device according to claim 10, wherein a part of said second diffraction grating has a pitch Λ 3 satisfying a relation: Λ.sub.3 =l'·(λ/2)2n" in which n" is the effective refractive index at said diffraction grating, and l' is an integer equal to or larger than 1.
Claim 13
Dependent Claim
27 words
A device according to claim 8, wherein said active layer contains a III-V group compound semiconductor, and said layer of material contains a II-VI group compound semiconductor.
Claim 14
Dependent Claim
33 words
A device according to claim 8, further comprising means on said active layer for causing oscillation within said active layer, said oscillation means and said active layer in combination forming a laser oscillater.
Claim 15
Dependent Claim
51 words
A device according to claim 13, wherein said oscillation means includes a pair of end faces bracketing said active layer, wherein said end faces are provided with a coating for confining the light of said wavelength λ within said active layer and taking the light of wavelength λ/2 from the device.
Claim 16
Dependent Claim
31 words
A device according to claim 13, wherein one of said electrodes is provided with a contact portion extended, in a stripe form, along a direction of oscillation of said laser oscillator.
Claim 17
Dependent Claim
29 words
A device according to claim 13, wherein said layer of material constitutes a ridge portion of a stripe form extended in a direction of oscillation of said laser oscillator.
Claim 18
Dependent Claim
21 words
A device according to claim 16, wherein one of said electrodes is in contact on a top of said ridge portion.
Claim 19
Dependent Claim
25 words
A device according to claim 16, wherein one of said electrodes is in contact on both sides in a lower part of said ridge portion.
Claim 20
Dependent Claim
26 words
A device according to claim 18, wherein said active layer and said layer of material are respectively sandwiched by clad layers to constitute a wave guide.
Claim 21
Dependent Claim
32 words
A device according to claim 16, wherein said active layer includes a p-n junction, said p-n junction having been formed in said active layer by one-side impurity diffusion from said ridge portion.
Claim 22
Dependent Claim
15 words
A device according to claim 1, further comprising a power source connected to said electrodes.
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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) | 1993-05-28 | 1993-11-27 | 1994-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-28 | 1997-11-27 | 1998-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-28 | 2001-11-27 | 2002-05-29 | $7700.00 | Window Closed / Lapsed |