Patent US3863105A successfully refreshed from Google Patents.
US3863105A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coaxial marx-bank driver circuit for pulse lasers
Assignee: United States Department of the Army
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Filing: 1974-03-01
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Granted: 1975-01-28
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Expires: 1994-03-01
Abstract
Abstract A flashlamp pumped laser system having a laser medium requiring optical pumping pulses of short duration, fast risetime, and high peak power which uniquely incorporates a low inductance, coaxially configured Marx-Bank circuit (a multi-stage circuit, each stage having a spark gap and a storage capacitor, with the capacitors being charged in parallel and discharged in series through the spark gaps) characterized by relatively small and inexpensive components and lower dc voltage ratings than those normally in use, whereby pulses of short duration, and high voltage and high input energy can be obtained for driving the flashlamp and whereby problems of insulation and high dc voltage breakdown can be minimized.
Inventors
- 👤 Theodore F Ewanizky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:43
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/53; H03K3/537; H01; H01S; H01S3/00; H01S3/09; H01S3/091; H01S3/0915; H01S3/092
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
139 words
In a laser pump driver circuit having a plurality of circuit stages each having a high voltage dc charging circuit including a resistor and capacitor for charging said capacitor from a high voltage dc supply, each said circuit stage further including a spark gap and a discharging resistor through which the corresponding capacitor is discharged during activation of said spark gap for deriving an ac voltage, the final Discharging resistor constituting a load resistor across which a laser pump can be connected, said capacitors being charged in parallel and connected in series by way of said activated spark gaps in reponse to triggering of an initial spark gap; the improvement comprising an elongated hollow cylindrical electrically conductive sheath surrounding and closely spaced from said capacitors, said capacitors being arranged coaxial with said sheath and being of hollow cylindrical configuration.
Claim 2
Dependent Claim
139 words
In a laser pump driver circuit having a plurality of circuit stages each having a high voltage dc charging circuit including a resistor and capacitor for charging said capacitor from a high voltage dc supply, each said circuit stage further including a spark gap and a discharging resistor through which the corresponding capacitor is discharged during activation of said spark gap for deriving an ac voltage, the final Discharging resistor constituting a load resistor across which a laser pump can be connected, said capacitors being charged in parallel and connected in series by way of said activated spark gaps in reponse to triggering of an initial spark gap; the improvement comprising an elongated hollow cylindrical electrically conductive sheath surrounding and closely spaced from said capacitors, said capacitors being arranged coaxial with said sheath and being of hollow cylindrical configuration.
Claim 3
Dependent Claim
60 words
The laser pump driver circuit according to claim 1 wherein said capacitors are provided with annular electrodes at opposite ends thereof, said spark gaps being of discoidal configuration and interposed between juxtaposed ends of adjacent capacitors, said spark gaps having an electrode of each of the two opposed end faces thereof which is connected to an adjacent annular capacitor electrode.
Claim 4
Dependent Claim
25 words
The laser pump driver circuit according to claim 1 wherein said sheath serves as one bus for connecting said stages to the high voltage supply.
Claim 5
Dependent Claim
25 words
The laser pump driver circuit according to claim 2 wherein said sheath serves as one bus for connecting said stages to the high voltage supply.
Claim 6
Dependent Claim
33 words
The laser pump driver circuit according to claim 2 wherein said discharging resistor is connected between a corresponding annular capacitor electrode and said sheath by way of a small aperture in said sheath.
Claim 7
Dependent Claim
38 words
The laser pump driver circuit according to claim 2 further including an electrically conductive plate electrode apertured to permit passage of circuit leads and connected electrically to the annular capacitor electrode of the final one of said capacitors.
Claim 8
Dependent Claim
17 words
The laser pump driver circuit according to claim 1 wherein said driver circuit is a Marx-Bank circuit.
Claim 9
Dependent Claim
54 words
The driver circuit according to claim 1 further including a coaxial laser flashlamp electrically connected by a first short lead to the capacitor of the last circuit stage and by a second short lead to a portion of said sheath which is adjacent the region of connection of said first lead to said capacitor.
Claim 10
Dependent Claim
49 words
The driver circuit according to claim 2 further including a coaxial laser flashlamp electrically connected by a first short lead to an annular electrode of the capacitor of the last circuit stage and by a second short lead to a portion of said sheath adjacent said annular capacitor electrode.
Claim 11
Dependent Claim
92 words
The driver circuit according to claim 8 further including a tubular laser having an electrode at each end thereof, said laser envelope being closely spaced from and coaxial with said flashlamp, said flashlamp being surrounded by a thin electrically conductive member coextensive with said flashlamp and laser, said thin member being connected adjacent one end thereof to one of said laser electrodes and connected adjacent the other end thereof to said first lead, the other of said laser electrodes being connected adjacent said other end of said member to said second lead.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-27 | 1978-07-29 | 1979-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-27 | 1982-07-29 | 1983-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-27 | 1986-07-29 | 1987-01-28 | $7700.00 | Window Closed / Lapsed |