US5377043A
Expired / Lapsed
US
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Ti:sapphire-pumped high repetition rate femtosecond optical parametric oscillator
Assignee: Cornell Research Foundation Inc
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Filing: 1993-07-08
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Granted: 1994-12-27
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Expires: 2013-07-08
Abstract
Abstract A broadly tunable femtosecond optical parametric oscillator (OPO) based on KTiOPO 4 is externally pumped by a self-mode-locked Ti:sapphire laser. The laser is capable of continuous tuning from 1.2 micrometers to 1.37 micrometers in the signal branch and 1.8 to 2.15 micrometers in the idler branch, when using one set of OPO optics. Other optics expand the tuning range of the OPO from 1.0 micrometers to 2.75 micrometers, for example, by using three sets of mirrors and two different crystals. Without prisms in the OPO cavity, 215 mW of chirped pulses is generated in the signal branch, while 235 mW is generated in the idler branch. The total conversion efficiency, as measured by pump depletion, is 50%. With prisms in the cavity, nearly transform-limited pulses of 135 femtoseconds are generated, which can be shortened to 75 fs by increasing the output coupling.
Inventors
- 👤 Wayne S. Pelouch
- 👤 Peter E. Powers
- 👤 Chung L. Tang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:19
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/35; G02F1/39
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
126 words
A broadly tunable femtosecond optical parametric oscillator, comprising: (a) an oscillator cavity including beam output means; (b) a thin, non-linear optical crystal located in said cavity; (c) a continuous wave, mode-locked, titanium-doped sapphire crystal laser pumping source located externally of said cavity and producing a femtosecond pulsed pumping light beam having a first wavelength and a high repetition rate; and (d) means directing said pumping light beam onto a surface of said crystal to generate corresponding high repetition rate pulsed idler and signal beams at respective second and third wavelengths from said crystal, a selected one of said idler and signal beams being directed along said cavity for oscillation therein, a portion of said selected beam being emitted from said cavity through said beam output means.
Claim 2
Dependent Claim
126 words
A broadly tunable femtosecond optical parametric oscillator, comprising: (a) an oscillator cavity including beam output means; (b) a thin, non-linear optical crystal located in said cavity; (c) a continuous wave, mode-locked, titanium-doped sapphire crystal laser pumping source located externally of said cavity and producing a femtosecond pulsed pumping light beam having a first wavelength and a high repetition rate; and (d) means directing said pumping light beam onto a surface of said crystal to generate corresponding high repetition rate pulsed idler and signal beams at respective second and third wavelengths from said crystal, a selected one of said idler and signal beams being directed along said cavity for oscillation therein, a portion of said selected beam being emitted from said cavity through said beam output means.
Claim 3
Dependent Claim
24 words
The optical parametric oscillator of claim 1, wherein said laser pumping source pulses have a pulse width of between about 50 and 200 femtoseconds.
Claim 4
Dependent Claim
27 words
The optical parametic oscillator of claim 1, wherein laser pumping source produces corresponding femtosecond pulsed idler and signal beams whereby said emitted beam consists of femtosecond pulses.
Claim 5
Dependent Claim
19 words
The optical parametic oscillator of claim 3, further including tuning means for adjusting the wavelength of said output beam.
Claim 6
Dependent Claim
28 words
The optical parametic oscillator of claim 4, wherein said cavity has an adjustable length, and wherein said tuning means includes means for adjusting the length of said cavity.
Claim 7
Dependent Claim
23 words
The optical parametric oscillator of claim 4, wherein said tuning means includes means for varying said first wavelength of said pumping light beam.
Claim 8
Dependent Claim
28 words
The optical parametric oscillator of claim 4, wherein said crystal is rotatable to adjust its phase-matching angle, and wherein said tuning means includes means for rotating said crystal.
Claim 9
Dependent Claim
24 words
The optical parametric oscillator of claim 7, wherein said tuning means further includes means for varying said first wavelength of said pumping light beam.
Claim 10
Dependent Claim
24 words
The optical parametric oscillator of claim 4, wherein said tuning means includes means for tuning said laser pumping source over a predetermined wavelength range.
Claim 11
Dependent Claim
19 words
The optical parametric oscillator of claim 1, further including tuning means for varying the wavelength of said emitted beam.
Claim 12
Dependent Claim
19 words
The optical parametric oscillator of claim 10, wherein said tuning means comprises means adjusting the phase-matching of said crystal.
Claim 13
Dependent Claim
31 words
The optical parametric oscillator of claim 11, wherein said means adjusting the phase-matching of said crystal includes means for rotating said crystal and means for adjusting the length of said cavity.
Claim 14
Dependent Claim
20 words
The optical parametric oscillator of claim 10, wherein said tuning means includes means for adjusting the length of said cavity.
Claim 15
Dependent Claim
22 words
The optical parametric oscillator of claim 10, wherein said tuning means includes means for changing the wavelength of said pumping light beam.
Claim 16
Dependent Claim
31 words
The optical parametric oscillator of claim 14, wherein said pumping light beam is variable over a predetermined wavelength range to vary the wavelength of said emitted beam over a corresponding range.
Claim 17
Dependent Claim
13 words
The optical parametric oscillator of claim 1, wherein said optical crystal is KTP.
Claim 18
Dependent Claim
18 words
The optical parametric oscillator of claim 16, wherein said optical crystal is cut for type II phase matching.
Claim 19
Dependent Claim
21 words
The optical parametric oscillator of claim 1, wherein said laser pumping source operates at a repetition rate of about 100 MHz.
References Cited (Backward Citations)
US3548199A
Cited
US3949323A
Cited
US4085335A
Cited
US4231838A
Cited
US4305778A
Cited
US4464761A
Cited
US4517675A
Cited
US4485473A
Cited
US4641312A
Cited
US4612641A
Cited
US4639923A
Cited
US4646308A
Cited
US4815080A
Cited
US4793894A
Cited
US4932031A
Cited
US4951294A
Cited
US5034951A
Cited
US5053641A
Cited
US5033057A
Cited
US5017806A
Cited
US5212698A
Cited
US5047668A
Cited
US5079772A
Cited
US5144629A
Cited
US5163059A
Cited
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1997-12-26 | 1998-06-27 | 1998-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-12-26 | 2002-06-27 | 2002-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-12-26 | 2006-06-27 | 2006-12-27 | $7700.00 | Window Closed / Lapsed |