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Hollow cylindrical solid state laser medium and a laser system using the medium
| Details |
Inventors: Ream, Stanley; Lee, Chun-Sheu; Fukae, Kenneth A.;
Assignee: Amada Engineering & Service Co., Inc. (La Mirada, CA)
Primary Examiner: Davie; James W.
Assistant Examiner: Vo; Xuan T.
Attorney, Agent or Firm: Wigman & Cohen
A solid state laser medium for use in a solid state laser oscillator uses a hollow cylindrical solid state laser medium which is formed cylindrically in order to improve the cooling efficiency of the laser. The laser includes a pumping device for exciting the laser medium and an optical resonator that is arranged on both ends in the axial direction of the laser medium. The pumping device includes a plurality of flash lamps that are arranged on the outside, with respect to the central longitudinal access of the laser medium, of the outer surface of the hollow cylindrical laser medium and an outer reflector that is arranged so as to enclose the flash lamps and the laser medium, from the outside, with respect to the central longitudinal access of the laser medium, of the flash lamps, and a cylindrical inner reflector with outer diameter which is slightly smaller than the inner diameter of the laser medium, the inner reflector being inserted in the cavity of the laser medium. Cooling apparatus for cooling the hollow cylindrical solid state laser medium from both the outer longitudinal surface and the inner longitudinal surface of the hollow cylinder are also provided. |
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DETAILED DESCRIPTION What is claimed is: 1.
A laser device, comprising: a hollow cylindrical solid state laser medium; pumping means for exciting the laser medium; and an optical resonator that is arranged on both ends in the axial direction of said laser medium, for causing the light emitted into said laser medium to travel back and forth along the axial direction of the laser medium, in which said pumping means comprises: (a) a plurality of flash lamps that are arranged in the outside, with respect to the central longitudinal axis of the laser medium, of the outer surface of said hollow cylindrical laser medium; (b) an outer reflector that is arranged so as to enclose the flash lamps and said laser medium, from outside with respect to the central longitudinal axis of the laser medium, of the flash lamps; and (c) a cylindrical inner reflector with outer diameter which is slightly smaller than the inner diameter of said laser medium, said inner reflector being inserted in the cavity of said laser medium.
2.
The laser device of claim 1, further comprising cooling means for cooling the hollow cylindrical solid state laser medium from both of the outer longitudinal surface and the inner longitudinal surface of the hollow cylinder, in which said cooling means comprises: (a) an outer shielding member made of a transparent material for covering the outer surface of said hollow cylindrical laser medium, said outer shielding member having a predetermined spacing from the outer surface; (b) an inner shielding member which serves also as an inner reflector for the emitted light, said inner shielding member having an outer diameter that is slightly smaller than the inner diameter of said laser medium, said inner shielding member being inserted in the cavity of the laser medium; and (c) a coolant that is flowed in the channel formed between said medium and the outer shielding member and also in the channel formed between said laser medium and the inner shielding member.
3.
The laser device of claim 1, in which said hollow cylindrical solid state laser medium comprises a hollow circular cylindrical solid state laser medium
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