Coherent light generators – Particular pumping means – Pumping with optical or radiant energy
Patent
1999-01-19
2000-05-09
Scott, Jr., Leon
Coherent light generators
Particular pumping means
Pumping with optical or radiant energy
372 5, 372 82, H01S 3091
Patent
active
060613793
ABSTRACT:
Two techniques for producing plasma x-ray laser amplifiers, encompassing laser generated high density, micron-sized plasma columns, and microwave driven low density, large plasma volumes which provide the population inversions necessary for x-ray lasing to occur in the plasmas. The laser driven plasma is created by short-pulse, high power laser beams produced by chirped pulse amplification techniques, which are confined to micron-sized cylindrical channels by self-focusing effects and electron density conditioning means. The extremely high powers provide for complete stripping of medium to high Z atoms, which allows for recombination cascading to produce population inversions on the higher energy x-ray transition levels. The very short plasma creation times allow a laser produced "seed" x-ray pulse to be properly timed for injection into the plasma when population inversions reach maximum levels. The microwave driven low density plasma laser produces the population inversion required for laser amplification by use of cyclotron resonance heating of electrons, which affects the fractional ionization and the electron induced de-excitation processes responsible for output power determination. Due to the ability to create large volume plasmas and rapidly change the electron temperature, optimal power levels are achieved. This type of laser may also operate in other, longer wavelength regions of the electromagnetic spectrum.
REFERENCES:
patent: 5335238 (1994-08-01), Bahns
patent: 5345465 (1994-09-01), Bahns
patent: 5394411 (1995-02-01), Milchberg et al.
patent: 5637962 (1997-06-01), Prono et al.
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