# US 4,395,770 A · Segmented plasma excitation-recombination light source > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,395,770 A - Document ID: US4395770A - Status: Granted - Kind: A - Application number: 06/367,092 - Filed: 1982-04-09 - Granted: 1983-07-26 - Earliest claimed: 1979-10-05 - Assignees: Bell Telephone Laboratories, Incorporated - Inventors: William T. Silfvast; Leo H. Szeto; Obert R. Wood, II - Web page: https://patentgrep.com/patent/US4395770A ## CPC - H01S 3/031: {Metal vapour lasers, e.g. metal vapour generation} - H01S 3/097: by gas discharge of a gas laser - 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 ## Abstract An electrical signal, such as a high current pulse, is applied to a series of two or more conducting strips (101-110) installed in series in a laser cavity (150, 151) containing either a buffer gas or a vacuum. The strips are separated by small gaps. When the electrical signal is applied to the strips, plasmas (141-149) are formed in the gap regions. The plasmas are comprised of ions from the strip material. Once formed, these plasmas expand hemispherically, cool and recombine to generate radiation. The composition of the plasmas depends on the strip material, the electric field in the gaps, the gap size and the background gas type and pressure. ## Claims ### Claim 1 A recombination laser comprising: a resonant laser cavity (150, 151) containing a laser medium and energy abstracting means adapted to permit egress of lasing radiation therefrom, excitation means (130) for producing said lasing radiation in said resonant laser cavity; said excitation means comprising at least two conductor strips (101-110) having at least one gap, which at least one gap provides at least one intervening discharge path; and means for applying an electrical signal to said at least two conductor strips; and a cell (125) for containing a background gas and in which said at least two strips are located; at least a portion of said at least two conductor strips being fabricated from a material which is converted into a plasma (141-149) as a result of the application of said electrical signal, which plasma cools and recombines to generate said lasing radiation (170). ### Claim 2 (depends on 1) The recombination laser as defined in claim 1 which further includes a background buffer gas. ### Claim 3 (depends on 2) The recombination laser as defined in claim 2 wherein said background buffer gas is helium. ### Claim 4 (depends on 3) The recombination laser as defined in claim 3 wherein said portion comprises silver. ### Claim 5 (depends on 3) The recombination laser as defined in claim 3 wherein said portion comprises cadmium. ### Claim 6 (depends on 3) The recombination laser as defined in claim 3 wherein said portion comprises carbon. ### Claim 7 (depends on 3) The recombination laser as defined in claim 3 wherein said portion comprises indium. ### Claim 8 (depends on 3) The recombination laser as defined in claim 3 wherein said portion comprises magnesium. ### Claim 9 (depends on 3) The recombination laser as defined in claim 3 wherein said portion comprises lead. ### Claim 10 (depends on 3) The recombination laser as defined in claim 3 wherein said portion comprises tin. ### Claim 11 (depends on 3) The recombination laser as defined in claim 3 wherein said portion comprises zinc. ### Claim 12 (depends on 3) The recombination laser as defined in claim 3 wherein said portion comprises calcium. ### Claim 13 (depends on 3) The recombination laser as defined in claim 3 wherein said portion comprises copper. ### Claim 14 (depends on 3) The recombination laser as defined in claim 3 wherein said portion comprises bismuth. ### Claim 15 (depends on 1) The recombination laser of claim 1 wherein the entirety of each of said strips comprises said material. ### Claim 16 (depends on 1) The recombination laser of claim 1 wherein said applying means includes means for applying a voltage across said strips and wherein said at least one portion has a more negative voltage applied to it. ### Claim 17 (depends on 16) The recombination laser of claim 16 wherein at least one of said strips comprises electrically connected first and second portions, said first portions comprising said material and having a negative voltage applied thereto and said second portions comprising another material from which no plasma forms and to which a positive voltage is applied. ### Claim 18 (depends on 1) The recombination laser of claim 1 wherein said excitation means further includes at least two other strips arranged so as to form a second plasma which expands toward said first plasma. ### Claim 19 A recombination plasma light source comprising: excitation means for producing radiation; said excitation means comprising at least two electrodes having at least one gap, which at least one gap provides at least one intervening discharge path; and means for applying an electrical signal to said at least two electrodes; at least a portion of said at least two electrodes being fabricated from a material which is converted into a plasma as a result of the application of said electrical signal, which plasma cools and recombines to generate said radiation.