Browse Prior Art Database

Q Switch for Ruby Laser

IP.com Disclosure Number: IPCOM000096106D
Original Publication Date: 1964-Dec-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Peticolas, WL: AUTHOR [+2]

Abstract

Laser device 10 comprises an active element 11, a prism 12, and a Q-switch 13. When activated by a flash tube 14, laser 10 operates to produce a giant pulse without undesirable Raman emission which causes scattering and reduces the power of the pulse. To achieve this elimination of Raman emission, Q-switch 13 is provided with a path length of one millimeter or less and can be formed either as in A, or B, or C. Form A comprises optical glass cell 15 of one millimeter or less filled with a solution of dye 16 bleachable at the wavelength of laser 10, such as vanadium-phthalocyanide. Because of the short path length, nitrobenzene can be used as a solvent for dye 16 even though it is a Raman active solvent.

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Q Switch for Ruby Laser

Laser device 10 comprises an active element 11, a prism 12, and a Q-switch
13. When activated by a flash tube 14, laser 10 operates to produce a giant pulse without undesirable Raman emission which causes scattering and reduces the power of the pulse. To achieve this elimination of Raman emission, Q- switch 13 is provided with a path length of one millimeter or less and can be formed either as in A, or B, or C. Form A comprises optical glass cell 15 of one millimeter or less filled with a solution of dye 16 bleachable at the wavelength of laser 10, such as vanadium-phthalocyanide. Because of the short path length, nitrobenzene can be used as a solvent for dye 16 even though it is a Raman active solvent.

As an example of the improved output power, when the active element 11 is a ruby having a 1200 joule input and the concentration of vanadium- phthalocyanide in nitrobenzene is such to give an optical density of .325 at the 6943 angstroms wavelength of the ruby, a giant pulse of 11 megawatts with a half-width of 30 nanoseconds is produced.

Forms B and C are solid state Q-switches which have a path length of one millimeter or less. In form B, bleachable dye 16 is dispersed in a transparent polymeric film 17, such as polystyrene; acrylic resins, for example, polymethylmethacrylate, and vinylidene chloride copolymers, for example, vinyl chloride-vinylidene chloride copolymer and vinylidene chloride-acrylonitrile copolymer. The bleachable dye an...