`
`(191
`
`mi
`
`3,900,803
`
`[451 Aug. 19, 1975
`Silfvast et al.
`
`
`1541 LASERS OPTICALLY PUMPED BY
`LASER-PRODUCED PLASMA
`
`[751
`
`Inventors: William Thomas Silfvast: Obert
`Reeves Wood 11. both of Holmdel
`Twp., Monmouth County. NJ.
`
`[73] Assignee: Bell Telephone Laboratories.
`Incorporated, Murray Hill. NJ‘
`
`122]
`
`Filed:
`
`Apr. 24, 1974
`
`[21] Appl. No.1-163.616
`
`
`331/9-1.Sl’:33()/4.3
`[52] US. Cl. .................... AK
`
`. . . . . . . .
`. . . . . . . . . .. H018 3/09
`.
`[51]
`Int. Cl.‘-’ . . . .
`. . . . . . . .
`.
`Field of Search.”................... 331/9451331)/4.3
`I58]
`
`[56]
`
`3.164.782
`11421.66!)
`
`References Cited
`UNITED STATES PATENTS
`
`l/1965 Ordway. Jr.................... . 331/94.5 P
`6/1974
`Shang et al .................... . 331/945 1-’
`OTHER PUBLICATIONS
`
`Furumoto ct a|.. Optical Pumps for Organic Dye La-
`sers. Applied Optics. Vol. 8, No. 8. (August 1969),
`pp. 1613-1623.
`
`Primary l§.\‘umim'r—William L. Sikes
`.—lIrurnz'_\'. Agent. or Firm—-Wilford L. Wisner
`
`[57 1
`
`ABSTRACT
`
`Laser solids. liquids and gases are pumped by a new
`technique in which the output from an efficient mo-
`lecular laser. such as a CO._. laser.
`ionizes a medium.
`such as xenon. into a generally cylindrical plasma vol-
`ume.
`in proximity to the pumped laser body. Break«
`down yields a visible and ultraviolet-racliutiomemitting
`plasma in that volume to pump the laser body. The
`spectral radiance of the plasma is significantly higher
`than that produced by a d-c—dischargc-heated plasma
`at nearly all wavelengths in the plasma spectrum The
`risetime of radiation from the laser-produced plasma
`can also be significantly shorter than that of a d—e
`heated plasma. A further advantage resides in the fact
`that in some applications the attenuating walls neetletl
`by tlashlamps l11'.l_\’ be eliminated with the result that
`laser
`threshold is more readily l'C'dL‘l1L‘Ll. Tra\eling
`waive excitation niay he provided by oblique incidence
`of the pumping laser beam through the ioni‘/able me-
`dium to create sequential lt)l‘tl'/.‘dIl0l‘l of portions of that
`medium along the length of the pumped laser bod)‘.
`
`5 Claims. 12 I)ra\-zing Figures
`
`
`
`DETECTOR
`
`MASKING
`73 MATERIAL
`FLASHLAMP
`
`
`
`ASML 1110
`ASML 1110
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