US5579152A
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US
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Tunable optical parametric oscillator
Assignee: Cornell Research Foundation Inc
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Filing: 1995-01-19
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Granted: 1996-11-26
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Expires: 2015-01-19
Abstract
Abstract A broadly tunable femtosecond optical parametric generator includes a cavity having a pumping section in which is located a nonlinear crystal selected from the group CTA and RTA, cut for noncritical phasematching. The plane of the optical x axis and or the optical y axis of the crystal is aligned with the axis of the pumping section. A Ti:S laser pumping beam is directed into the pumping section either collinearly or noncollinearly with the pumping section axis and impinges on the crystal to produce signal and idler beams. The laser is tunable to produce OPO output beams between about 1 and 4 μm.
Inventors
- 👤 Randall J. Ellingson
- 👤 Peter E. Powers
- 👤 Lap K. Cheng
- 👤 Chung L. Tang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:26
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/35; G02F1/39; G02F1/353; G02F1/3542; G02F1/392
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
132 words
A broadly tunable femtosecond optical parametric generator, comprising: a cavity having a pumping section defined by a first pair of spaced mirrors; a nonlinear optical crystal in said pumping section of said cavity, said crystal being selected from the group consisting of KTP, CTA and RTA and having optical x, y, and z axes; a tunable femtosecond pump laser producing a pumping beam having pulses of less than about 100 fs at a wavelength tunable between about 0.7 μm and 1.1 μm; and means directing said pumping beam to impinge on said crystal in said pumping section, said pumping beam lying in the plane of said crystal optical x and optical y axes to cause said pumping beam to generate in said crystal femtosecond idler and signal output beams at tunable wavelengths.
Claim 2
Dependent Claim
132 words
A broadly tunable femtosecond optical parametric generator, comprising: a cavity having a pumping section defined by a first pair of spaced mirrors; a nonlinear optical crystal in said pumping section of said cavity, said crystal being selected from the group consisting of KTP, CTA and RTA and having optical x, y, and z axes; a tunable femtosecond pump laser producing a pumping beam having pulses of less than about 100 fs at a wavelength tunable between about 0.7 μm and 1.1 μm; and means directing said pumping beam to impinge on said crystal in said pumping section, said pumping beam lying in the plane of said crystal optical x and optical y axes to cause said pumping beam to generate in said crystal femtosecond idler and signal output beams at tunable wavelengths.
Claim 3
Dependent Claim
57 words
The generator of claim 1, wherein said crystal is KTP oriented for noncritical phasematching along its optical y-axis, said pumping beam being tunable to produce a femtosecond signal beam having a wavelength of between about 1.0 μm and about 1.6 μm and a femtosecond idler beam having a wavelength of between about 2.2 μm and about 3.5μm.
Claim 4
Dependent Claim
56 words
The generator of claim 1, wherein said crystal is KTP oriented for noncritical phasematching along its optical x-axis, said pumping beam being tunable to produce a femtosecond signal beam having a wavelength of between about 1.0 μm, and 1.6 μm and a femtosecond idler beam having a wavelength between about 2.2 μm and about 3.5 μm.
Claim 5
Dependent Claim
13 words
The generator of claim 1, wherein said pump laser is a Ti:S laser.
Claim 6
Dependent Claim
33 words
The generator of claim 1, wherein said pumping section has an axis, said crystal lies on said axis, and said pumping beam is coaxial therewith to provide a collinear geometry for said generator.
Claim 7
Dependent Claim
38 words
The generator of claim 5, wherein said crystal is located in said pumping section in such a way as to selectively position a selected one of said crystal optical axis to be parallel to said pumping section axes.
Claim 8
Dependent Claim
20 words
The generator of claim 6, wherein said pumping beam is polarized in a plane perpendicular to the pumping beam axis.
Claim 9
Dependent Claim
18 words
The generator of claim 7, wherein said signal beam is polarized in the plane of said pumping beam.
Claim 10
Dependent Claim
21 words
The generator of claim 7, wherein said idler beam is polarized in the plane of the z axis of said crystal.
Claim 11
Dependent Claim
51 words
The generator of claim 1, wherein said pumping section has an axis, said crystal has a selected optical axis aligned with said pumping section axis, and said pumping beam is directed into said pumping section at an angle to said pumping section axis to provide a noncollinear geometry for said generator.
Claim 12
Dependent Claim
68 words
The generator of claim 1, wherein said cavity further includes first and second flat mirrors defining first and second ends of the cavity, said first flat mirror totally reflecting a selected one of said signal and idler beams to provide a resonant oscillator cavity for said selected beam, and said second flat mirror being coated to at least partially transmit said selected beam to provide an output coupler.
Claim 13
Dependent Claim
53 words
The generator of claim 11, wherein said first pair of spaced mirrors comprises first and second curved mirrors, said first curved mirror transmitting said pumping beam into said pumping section and said second curved mirror being coated to transmit the nonselected one of said signal and idler beams out of said pumping section.
Claim 14
Dependent Claim
46 words
The generator of claim 1 wherein said crystal is CTA, said pumping beam being tunable to produce a signal beam having a wavelength of between about 1.56 μm and 1.60 μm and an idler beam having a wavelength of between about 1.27 μm and 1.82 μm.
Claim 15
Dependent Claim
47 words
The generator of claim 1, wherein said crystal is RTA, said pumping beam being tunable to produce a signal beam having a wavelength of between about 1.2 μm and about 2.4 μm and an idler beam having a wavelength of between about 2.1 μm and 3.65 μm.
Claim 16
Dependent Claim
13 words
The generator of claim 1, where said crystal is cut for noncritical phasematching.
Claim 17
Dependent Claim
125 words
A broadly tunable femtosecond optical parametric generator comprising: a cavity including a pumping section; a nonlinear optical crystal selected from the group consisting of KTP, CTA, KNbO 3 , RTA, LiIO3, LiNbO 3 , AgGaSe 2 , and AgGaS 2 in said pumping section, said crystal having optical x, optical y, and optical z axes; a femtosecond pump laser having a pumping beam; and means directing said pumping beam into said pumping section to impinge on said crystal in a direction parallel to one of said crystal optical x and optical y axes and to polarize said pumping beam in a plane parallel to the other of said crystal x and y axes, said pumping beam producing signal and idler output beams in said crystal.
Claim 18
Dependent Claim
125 words
A broadly tunable femtosecond optical parametric generator comprising: a cavity including a pumping section; a nonlinear optical crystal selected from the group consisting of KTP, CTA, KNbO 3 , RTA, LiIO3, LiNbO 3 , AgGaSe 2 , and AgGaS 2 in said pumping section, said crystal having optical x, optical y, and optical z axes; a femtosecond pump laser having a pumping beam; and means directing said pumping beam into said pumping section to impinge on said crystal in a direction parallel to one of said crystal optical x and optical y axes and to polarize said pumping beam in a plane parallel to the other of said crystal x and y axes, said pumping beam producing signal and idler output beams in said crystal.
Claim 19
Dependent Claim
22 words
The generator of claim 16, further including means directing a selected one of said signal and idler beams out of said cavity.
Claim 20
Dependent Claim
18 words
The generator of claim 17, wherein said signal beam is polarized in the plane of said pumping beam.
Claim 21
Dependent Claim
22 words
The generator of claim 16, wherein said idler beam is polarized in the plane of the optical z axis of said crystal.
Claim 22
Dependent Claim
22 words
The generator of claim 16, wherein said pump laser is tunable to vary the wavelengths of said signal and idler output beams.
Claim 23
Dependent Claim
19 words
The generator of claim 16, further including means to vary the wavelengths of said signal and idler output beams.
References Cited (Backward Citations)
US4485473A
Cited
US4639923A
Cited
US5034951A
Cited
US5053641A
Cited
US5033057A
Cited
US5017806A
Cited
US5047668A
Cited
US5181211A
Cited
US5291503A
Cited
US5377043A
Cited
US5333142A
Cited
US5311352A
Cited
US5296960A
Cited
US5406408A
Cited
US5365366A
Cited
US5371752A
Cited
US5383198A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-11-26 | 2000-05-27 | 2000-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-11-26 | 2004-05-27 | 2004-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-11-26 | 2008-05-27 | 2008-11-26 | $7700.00 | Window Closed / Lapsed |