US4913533A
Expired / Lapsed
US
⏱️ 0.0 years remaining
KTP crystal nonlinear optical device with reduced drift and damage
Assignee: Newport Corp USA
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Filing: 1987-12-22
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Granted: 1990-04-03
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Expires: 2007-12-22
Abstract
Abstract A KTP crystal in a nonlinear optical device is heated to and operated at a temperature of at least 50° C. and less than 350° C., and more preferably about 90° C. to about 200° C., and most preferably to about 100° C. to about 125° C., to reduce drift and damage. The KTP crystal is placed in an oven or other heating device, which may be regulated or unregulated. The KTP may be cut at the room temperature phase matching angle and angle tuned for operation at the higher temperature, or the KTP may be cut at the correct angle for phase matching at the operating temperature.
Inventors
- 👤 James D. Kafka
- 👤 Thomas M. Baer
- 👤 Richard L. Herbst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:33
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/35; G02F1/37; G02F1/3525
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
81 words
In a nonlinear optical device comprising means to direct at least one incident beam of electromagnetic radiation into a crystal having nonlinear optical properties whereby electromagnetic radiation emerging from said crystal contains at least one frequency different from the frequency of any incident beam of radiation, wherein the improvement comprises a KTP crystal heated to a drift reducing operating temperature at which a reduction of a falloff of output power as a function of time from said KTP crystal is achieved.
Claim 2
Dependent Claim
81 words
In a nonlinear optical device comprising means to direct at least one incident beam of electromagnetic radiation into a crystal having nonlinear optical properties whereby electromagnetic radiation emerging from said crystal contains at least one frequency different from the frequency of any incident beam of radiation, wherein the improvement comprises a KTP crystal heated to a drift reducing operating temperature at which a reduction of a falloff of output power as a function of time from said KTP crystal is achieved.
Claim 3
Dependent Claim
20 words
The device of claim 1 wherein the KTP crystal is heated to a temperature of at least about 50° C.
Claim 4
Dependent Claim
22 words
The device of claim 1 wherein the KTP crystal is heated to a temperature of about 100° C. to about 125° C.
Claim 5
Dependent Claim
22 words
The device of claim 1 wherein the KTP crystal is heated to a temperature of about 90° C. to about 200° C.
Claim 6
Dependent Claim
18 words
The device of claim 1 wherein the KTP crystal is heated to a temperature below about 350° C.
Claim 7
Dependent Claim
25 words
The device of claim 1 wherein the KTP crystal is cut to phase match at room temperature and is angle tuned at the operating temperature.
Claim 8
Dependent Claim
18 words
The device of claim 1 wherein the KTP crystal is cut to phase match at the operating temperature.
Claim 9
Dependent Claim
15 words
The device of claim 1 further including heating means operatively connected to the KTP crystal.
Claim 10
Dependent Claim
11 words
The device of claim 8 wherein the heating means are unregulated.
Claim 11
Dependent Claim
11 words
The device of claim 8 wherein the heating means are regulated.
Claim 12
Dependent Claim
21 words
The device of claim 8 wherein the heating means includes servo means for maintaining the operating temperature within a preselected range.
Claim 13
Independent Claim
85 words
A method of reducing drift in a nonlinear optical device comprising means to direct at least one incident beam of electromagnetic radiation into a KTP crystal having nonlinear optical properties whereby electromagnetic radiation emerging from said crystal contains at least one frequency different from the frequency of any incident beam of radiation, the method comprising heating said KTP crystal to a drift reducing operating temperature at which a reduction in falloff of output power as a function of time from said KTP crystal is achieved.
Claim 14
Independent Claim
85 words
A method of reducing drift in a nonlinear optical device comprising means to direct at least one incident beam of electromagnetic radiation into a KTP crystal having nonlinear optical properties whereby electromagnetic radiation emerging from said crystal contains at least one frequency different from the frequency of any incident beam of radiation, the method comprising heating said KTP crystal to a drift reducing operating temperature at which a reduction in falloff of output power as a function of time from said KTP crystal is achieved.
Claim 15
Dependent Claim
13 words
The method of claim 12 comprising heating to at least about 50° C.
Claim 16
Dependent Claim
18 words
The method of claim 12 comprising heating to a temperature of about 100° C. to about 125° C.
Claim 17
Dependent Claim
18 words
The method of claim 12 comprising heating to a temperature of about 90° C. to about 200° C.
Claim 18
Dependent Claim
16 words
The method of claim 12 comprising heating to a temperature of lass than about 350° C.
Claim 19
Dependent Claim
27 words
The method of claim 12 further comprising cutting the KTP crystal to phase match at normal temperature and angle tuning the KTP crystal at the operating temperature.
Claim 20
Dependent Claim
18 words
The method of claim 12 further comprising cutting the KTP crystal to phase match at the operating temperature.
References Cited (Backward Citations)
US4019159A
Cited
US4739507A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-04-02 | 1993-10-02 | 1994-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-02 | 1997-10-02 | 1998-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-02 | 2001-10-02 | 2002-04-03 | $7700.00 | Window Closed / Lapsed |