RF excited mercury laser lamp

• US 4,188,591 A
• Filed: 10/07/1977
• Issued: 02/12/1980
• Est. Priority Date: 10/07/1977
• Status: Expired due to Term

• Current Assignee: United States Of America As Represented By The Secretary Of The Air Force
• Original Assignee: United States Of America As Represented By The Secretary Of The Air Force
• Inventors: Siegman, Anthony E., Artusy, Max T., Holmes, Neil C.
• Primary Examiner(s): Davie, James W.
• Application Number:
  US05/840,353
• Time in Patent Office: 858 Days
• Field of Search: 331/94.5 P, 331/94.5 D, 331/94.5 G, 331/94.5 R, 313/220
• US Class Current: 372/70
• CPC Class Codes: H01S 3/092 of flash lamp H01S3/0937 takes precedence ; flash lamps per se H01J61/80; circuit arrangements for operating flash lamps in general H05B41/30

Abstract

An optically pumped laser wherein the optical pumping means is in the form of a mercury discharge lamp and a radio-frequency excited coil surrounding the lamp. The discharge lamp is constructed in the form of a closed loop and is inductively excited by the high power radio-frequency coil. The coil forms the primary coil and the lamp the secondary coil of an air-core transformer. Current in the lamp is excited entirely by the radio frequency magnetic fields passing through the plane of the lamp thereby optically pumping the lasing medium.

Claims

1. In an optically pumped mercury laser having a laser tube, a lasing medium located within said laser tube and means operably connected to said laser tube for optically pumping said lasing medium, the improvement therein residing in said optical pumping means, said optical pumping means comprising a mercury discharge lamp in operable relationship with said laser tube, said mercury discharge lamp having a pair of hollow elongated legs spaced apart from each other and being disposed on opposite sides of and lying in the same plane as said laser tube, a hollow end portion interconnecting said legs at each end thereof, each of said end portions being positioned substantially perpendicular to the longitudinal axis of said legs, said discharge lamp thereby forming a closed rectangular loop surrounding and being substantially coaxial with said laser tube, a gas contained within said hollow legs and said end portions of said lamp, a radio-frequency excited coil, said coil being wound around the outside of said lamp in a direction substantially parallel to said legs and said end portions, respectively, of said lamp, thereby being in operable relationship with said lamp and a radio-frequency power supply operably connected to said coil whereby said radio-frequency excited coil forms the primary coil and said lamp forms the secondary coil of an air-core transformer, the current in said lamp being excited entirely by radio-frequency magnetic fields passing through said lamp.

2. In an optically pumped laser as defined in claim 1 wherein said radio-frequency power supply is in the form of a radio-frequency oscillator.

3. In an optically pumped laser as defined in claim 2 wherein said radio-frequency excited coil is made of copper tubing.

4. In an optically pumped laser as defined in claim 3 wherein said rectangular shaped mercury discharge lamp has a length of between 30 cm and 1 m and a width between 5-10 cm.

5. In an optically pumped laser as defined in claim 4 wherein the inner diameter of each of said legs being approximately 4 mm.

6. In an optically pumped laser as defined in claim 5 wherein said mercury discharge lamp is made of a chemically inert material.