Patent US4907850A successfully refreshed from Google Patents.
US4907850A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for periodically generating second harmonic
Assignee: Canon Inc
•
Filing: 1988-07-12
•
Granted: 1990-03-13
•
Expires: 2008-07-12
Abstract
Abstract An apparatus for periodically generating a second harmonic light comprises: a light source; and means for converting a fundamental wavelength light emitted from said light source to a second harmonic light, including optical wave guide means having a light propagation area and means for periodically varying a refractive index of the light propagation area.
Inventors
- 👤 Keisuke Araki
- 👤 Kenichi Ohta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:03
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/35; G02F1/37; G02F1/377; G02F1/3775; G02F1/01; G02F1/0147; G02F1/03; G02F1/353; G02F1/3544; G02F1/3548
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
67 words
An apparatus for periodically generating a second harmonic light comprising: a light source, and means for converting a fundamental wavelength light emitted from said light source to a second harmonic light, including optical wave guide means having a light propagation area and means for time-periodically varying a refractive index of the light propagation area over a range that includes at least one state which permits phase matching.
Claim 2
Independent Claim
67 words
An apparatus for periodically generating a second harmonic light comprising: a light source, and means for converting a fundamental wavelength light emitted from said light source to a second harmonic light, including optical wave guide means having a light propagation area and means for time-periodically varying a refractive index of the light propagation area over a range that includes at least one state which permits phase matching.
Claim 3
Dependent Claim
38 words
An apparatus for periodically generating a second harmonic light according to claim 1 wherein said means for time periodically varying the refractive index of said light propagation area time periodically varies a temperature of said light propagation area.
Claim 4
Dependent Claim
40 words
An apparatus for periodically generating a second harmonic light according to claim 1 wherein said means for time periodically varying the refractive index of said light propagation area time periodically varies an electric field applied to said light propagation area.
Claim 5
Dependent Claim
49 words
An element for converting a fundamental wavelength light to a second harmonic light comprising: optical wave guide means having a light propagation area; and means for time-periodically varying a refractive index of said light propagation area over a range that includes at least one state which permits phase matching.
Claim 6
Dependent Claim
49 words
An element for converting a fundamental wavelength light to a second harmonic light comprising: optical wave guide means having a light propagation area; and means for time-periodically varying a refractive index of said light propagation area over a range that includes at least one state which permits phase matching.
Claim 7
Dependent Claim
31 words
An element according to claim 4 wherein said means for time periodically varying the refractive index of said light propagation area time periodically varies a temperature of said light propagation area.
Claim 8
Dependent Claim
33 words
An element according to claim 4 wherein said means for time periodically varying the refractive index of said light propagation area time periodically varies an electric field applied to said light propagation area.
References Cited (Backward Citations)
US3584230A
Cited
US3586872A
Cited
US3624406A
Cited
US3831038A
Cited
US4001577A
Cited
US4236785A
Cited
US4767169A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-03-12 | 1993-09-11 | 1994-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-12 | 1997-09-11 | 1998-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-12 | 2001-09-11 | 2002-03-13 | $7700.00 | Window Closed / Lapsed |