Patent US3830557A successfully refreshed from Google Patents.
US3830557A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laser q-switching
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1973-09-06
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Granted: 1974-08-20
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Expires: 1993-09-06
Abstract
Abstract A transformer-driven electro-optic Q-switching arrangement reduces the high-voltage switching requirements with greatly simplified circuitry. Lasing efficiency is not significantly reduced even when the transformer rise time is twice as long as the laser pulse build-up time.
Inventors
- 👤 W Hook
- 👤 R Hilberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:29
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/10; H01S3/11; H01S3/1123; H01S3/115
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
162 words
A switching circuit for an electro-optic modulator, comprising: a step up transformer having primary and secondary windings; an electro-optic modulator in series with said secondary winding; means for establishing across said electro-optic modulator a predetermined direct current voltage effective to alter the phase between orthogonal components of light passing therethrough and including; a. a capacitor in series with said electro-optic modulator and said secondary winding; b. a pair of resistors connected in series across said secondary winding; and c. a diode rectifier having one side connected to the junction between said resistors and having the other side connected to the junction between said capacitor and said electro-optic modulator; and low voltage switching means in circuit with said primary winding for initiating a transient oscillatory current therein and thereby inducing in said secondary winding a transient alternating voltage pulse in opposition to said direct current voltage across said electro-optic modulator and with a peak voltage swing at least about twice the amplitude thereof.
Claim 2
Dependent Claim
162 words
A switching circuit for an electro-optic modulator, comprising: a step up transformer having primary and secondary windings; an electro-optic modulator in series with said secondary winding; means for establishing across said electro-optic modulator a predetermined direct current voltage effective to alter the phase between orthogonal components of light passing therethrough and including; a. a capacitor in series with said electro-optic modulator and said secondary winding; b. a pair of resistors connected in series across said secondary winding; and c. a diode rectifier having one side connected to the junction between said resistors and having the other side connected to the junction between said capacitor and said electro-optic modulator; and low voltage switching means in circuit with said primary winding for initiating a transient oscillatory current therein and thereby inducing in said secondary winding a transient alternating voltage pulse in opposition to said direct current voltage across said electro-optic modulator and with a peak voltage swing at least about twice the amplitude thereof.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-19 | 1978-02-18 | 1978-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-19 | 1982-02-18 | 1982-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-19 | 1986-02-18 | 1986-08-20 | $7700.00 | Window Closed / Lapsed |