US3703658A - Gas-dynamic discharge light source - Google Patents

Gas-dynamic discharge light source Download PDF

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Publication number
US3703658A
US3703658A US94744A US3703658DA US3703658A US 3703658 A US3703658 A US 3703658A US 94744 A US94744 A US 94744A US 3703658D A US3703658D A US 3703658DA US 3703658 A US3703658 A US 3703658A
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Prior art keywords
discharge
gas
light
optically transparent
chambers
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Expired - Lifetime
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US94744A
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English (en)
Inventor
Viktor Viktorovich Sysun
Boris Vasilievich Skvortsov
Jury Georgievich Basov
Vladimir Ivanovich Roldugin
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/09—Processes or apparatus for excitation, e.g. pumping
    • H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
    • H01S3/0915—Processes or apparatus for excitation, e.g. pumping using optical pumping by incoherent light
    • H01S3/092—Processes or apparatus for excitation, e.g. pumping using optical pumping by incoherent light of flash lamp

Definitions

  • the light source according to the invention is intended to produce strong recurrent lightflashes of short duration, for use mainly in the optical pumping of active media, predominantly liquid-type lasers based on organic dyestuffs.
  • the invention relatestogas-discharge light sources, and more specificallyto gas-dynamic impulse discharge devices in which emission in the optical wavelength range is produced by moving shock waves and plasma streams.
  • This device is made in the form of a T-shaped tube. Its discharge chamber is formed by the cross member of the said tube and two electrodes located at its opposite ends, between which the discharge takes place.
  • shock waves and the gas-discharge plasma thus produced are propagated into a cylindrical stub adjacent to the discharge chamber.
  • An object of the present invention is to provide a light sourcev free from the above-mentioned disadvantages.
  • a specific object of the invention is to provide a compact and reliable gas-dynamic discharge light source based on the interaction between counterdirected shock waves and streams of the gas-discharge plasma, ensuring higher efficiency in the conversion of the applied electrical energy into light emission, shorter light flashes, agreater density of the emission from a luminous'part of the device, and a greater share of radiation lying in the ultra-violet region of the spectrum.
  • a gasdynamic discharge light source comprising a gas-filled discharge chamber with a discharge gap formed .by electrodes and bounded by the walls of the discharge chamber connected to one end of a tube in which shock waves and the gas-discharge plasma are propagated, and a current-carrying bus arranged outside the chamber along the said gap and series-connected with it, has, according to the invention, at least one more discharge chamber in which a discharge is initiated simultaneously with a discharge in the firstv chamber, connected to the other end of the tube where shock waves are propagated, both discharge chambers having light-reflecting walls and the tube being made of ially arranged openings, sealed to a tube from fused an optically transparent material.
  • the walls of the discharge chambers adjacent to the current carrying bus be flatand arrangedv at right angles to the longitudinal axis of the optically transparent tube.
  • the discharge chambers may be made in the form of U- shaped tubes the middle parts of which are inter-connected by the optically transparent tube. It is desirable that the electrodes have flat working surfaces and be disposed so that their longitudinal axes are at right angles to the axis of the optically transparent tube.
  • the discharge chambers have conical adapters for connection to the optically transparent tube, with a solid angle of 15 to 60. It is preferable to make the discharge chambers from a heat-resistant material such as beryllium oxide, aluminum oxide, etc., with light-reflecting walls having axquartz glass by one ofthe conventional methods. It is also possible to make the discharge chambers and tube from the same optically transparent material, such as fused quartz glass having a coat of partly sintered, dif fuse-scattering silicon dioxide only on the dischargechamber walls bounding the discharge gaps.
  • the gas-dynamic impulse discharge light source disclosed herein is free from the disadvantages inherent in the cited device owing to the use' of interaction between shock waves and a travelling plasma.
  • a decrease in the ratio of the tube diameter to the discharge-chamber diameter will increase the velocity of shock waves and decrease the penetration of the gasdischarge plasma into the tube, thereby increasing the share of radiation lying in the ultra-violet region of the spectrum.
  • the device disclosed herein is intended to produce strong recurrent light flashes of short duration mainly used to optically pump active media, predominantly liquid-type lasers based on organic dyes.
  • the device disclosed herein may be successfully used in physicochemical investigations involving flash-photolysis of gases and solutions, in light-signalling equipment, etc.
  • FIG. 1 is a cut-away front view of a gas-dynamic discharge light source, according to the invention.
  • FIG. 2 is a cut-away top view of FIG. 1'
  • FIG. 3 is a cut-away front view of another embodiment of the invention.
  • FIG. 4 is a cut-away top view of FIG. 3;
  • FIG. 5 shows the connection of a gas-dynamic discharge light source.
  • a gas-dynamic discharge light source comprising two identically constructed opaque discharge chambers l and 2 having coaxial openings, sealed to an optically transparent tube 3 fabricated from fused quartz glass and intended to couple the emission.
  • Said chambers l and 2 with light-reflecting walls are fabricated from a heat-resistant material such as beryllium oxide or aluminum oxide, or from fused quartz glass with a coat 4 of reflecting silicon dioxide sintered to zero porosity.
  • Each chamber has in its middle part a flat wall 5 and, on the opposite side, a conical adapter 6 for connection to the optically transparent tube 3.
  • the chambers can be made as U-shaped tubes.
  • the solid angle of the conical adapter between the discharge chamber and said cylindrical tube may be chosen anywhere between and 60.
  • Built axially into the side walls of the discharge chambers 1 and 2 are two pairs of cylindrical amounts 7 which hold two pairs of identically constructed electrode assemblies with coincident longitudinal axes of symmetry, each of which comprises a thoriated-tungsten flat electrode 8 press-fitted into a hollow Kovar (NiCo-Fe alloy) holder 9 having a ring shoulder which gives support to a titanium cylinder 10 forming an annular gap around the mount 7, filled with tin in the course of sealing.
  • Kovar NiCo-Fe alloy
  • the electrode assemblies of the light source disclosed herein are built into the mounts 7 so that the flat surface of each electrode having a diameter close to the inside diameter of the mount is arranged approximately to level with the tube 3 near the flat wall of the chamber, producing parallel discharge gaps.
  • Mounted along said discharge gaps outside the discharge chamber and at right angles to the longitudinal axis of the tube 3 interconnecting the chambers 1 and 2 are two current-carrying buses 11 and 12 made in the form of metal caps put on the projecting flat walls of the chamber, through which the discharge-circuit current is passed.
  • Each bus is connected to one of the electrode assemblies of each discharge chamber.
  • the gas-dynamic discharge light source disclosed herein is filled with xenon under a pressure of to 100 Torrs.
  • the gas-dynamic discharge light source shown in FIGS. 3 and 4 differs from the one described above in that its discharge chambers l and 2 are fabricated from an opaque, light-reflecting, heat-resistant ceramic material, such as beryllium oxide or polycrystalline aluminum oxide, and hermetically sealed to an optically transparent tube 3.
  • an opaque, light-reflecting, heat-resistant ceramic material such as beryllium oxide or polycrystalline aluminum oxide
  • the gas-dynamic discharge light source disclosed herein operates as follows (FIG. 5). When the source is connected into a common-earth, low-inductance, balanced discharge circuit comprising two banks of storage capacitors 13 and 14 controlled by a two-channel series-firing unit 15, a gas discharge occurs simultaneously in both discharge chambers.
  • the light source disclosed herein has been tested under conditions of infrequent recurrent flashes with a duration of 25 to 40 p. sec and with a maximum discharge energy of over 4,000 joules.
  • a gas-discharge light source device producing light emission which is substantially in the optical wave length range, by means of shock waves and plasma streams, of the type comprising a gas-filled discharge chamber with two oppositely located electrodes and light-reflecting walls, wherein shock-waves and gasdischarge plasma are generated and propogated into an adjacent cylindrical space to produce a light source
  • the device comprises: an additional gas-filled discharge chamber provided with light-reflecting walls and electrodes, and connected for simultaneous discharge with the other discharge chamber; an optically transparent tube interconnecting said discharge chambers and providing said cylindrical space; a discharge gap in each of said discharge chambers, formed by said electrodes; and a current-carrying bus located outside each of the discharge chambers and connected thereto.
  • each discharge chamber adjacent to the current-carrying bus, is made flat and arranged at right angles to a longitudinal axis of the optically transparent tube.
  • the discharge chambers are made of a heat-resistant material, chosen from beryllium oxide, aluminum oxide, and the like, with internal light-reflecting walls, and have openings for communication with said optically transparent tube.
  • a gas-discharge light source device producing light emission substantially in the optical wave length range, by means of shock waves and plasma streams, of the type comprising a gas-filled discharge chamber with two oppositely located electrodes and light-reflecting walls, wherein, shock waves and gas-discharge plasma are generated and propagated into an adjacent cylindriconnected thereto, the device further characterized in that the tube and the discharge chambers are formed of transparent fused quartz and the discharge chambers include a coat of partly sintered, diffuse-scattering silicon dioxide on its outside wall surface in the region bounding the discharge gaps.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Electromagnetism (AREA)
  • Optics & Photonics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Lasers (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Plasma Technology (AREA)
US94744A 1969-12-24 1970-12-03 Gas-dynamic discharge light source Expired - Lifetime US3703658A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SU1388550A SU308672A1 (ru) 1969-12-24 1969-12-24 Газодинамический импульсный источник света

Publications (1)

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US3703658A true US3703658A (en) 1972-11-21

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US94744A Expired - Lifetime US3703658A (en) 1969-12-24 1970-12-03 Gas-dynamic discharge light source

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US (1) US3703658A (enrdf_load_stackoverflow)
JP (1) JPS4822318B1 (enrdf_load_stackoverflow)
CS (1) CS160984B1 (enrdf_load_stackoverflow)
FR (1) FR2072040B1 (enrdf_load_stackoverflow)
GB (1) GB1304468A (enrdf_load_stackoverflow)
SU (1) SU308672A1 (enrdf_load_stackoverflow)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6150020U (enrdf_load_stackoverflow) * 1984-07-13 1986-04-04

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2775718A (en) * 1954-03-04 1956-12-25 Dubilier William Electronic speed light
US2922890A (en) * 1957-10-08 1960-01-26 Josephson Vernal Magnetic method for producing high velocity shock waves in gases
US2940011A (en) * 1958-07-11 1960-06-07 Alan C Kolb Device for producing high temperatures
US2975332A (en) * 1959-12-02 1961-03-14 Lockheed Aircraft Corp Plasma propulsion device
US3289026A (en) * 1964-01-07 1966-11-29 Raymond C Elton High intensity reproducible shock radiation source

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2775718A (en) * 1954-03-04 1956-12-25 Dubilier William Electronic speed light
US2922890A (en) * 1957-10-08 1960-01-26 Josephson Vernal Magnetic method for producing high velocity shock waves in gases
US2940011A (en) * 1958-07-11 1960-06-07 Alan C Kolb Device for producing high temperatures
US2975332A (en) * 1959-12-02 1961-03-14 Lockheed Aircraft Corp Plasma propulsion device
US3289026A (en) * 1964-01-07 1966-11-29 Raymond C Elton High intensity reproducible shock radiation source

Also Published As

Publication number Publication date
FR2072040A1 (enrdf_load_stackoverflow) 1971-09-24
FR2072040B1 (enrdf_load_stackoverflow) 1975-01-10
GB1304468A (enrdf_load_stackoverflow) 1973-01-24
SU308672A1 (ru) 1976-02-15
JPS4822318B1 (enrdf_load_stackoverflow) 1973-07-05
CS160984B1 (enrdf_load_stackoverflow) 1975-05-04

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