TITLE

Measurement of population inversions and gain in carbon fiber plasmas

AUTHOR(S)
Milchberg, H.; Skinner, C. H.; Suckewer, S.; Voorhees, D.
PUB. DATE
December 1985
SOURCE
Applied Physics Letters;12/1/1985, Vol. 47 Issue 11, p1151
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A CO2 laser (∼0.5 kJ energy, 50–80 ns pulse width) was focused onto the end of an axially oriented, thick (35–350 μ) carbon fiber with or without a magnetic field present along the laser-fiber axis. We present evidence for axial-to-transverse enhancement of the C VI 182 Å (n=3–2) transition, which is correlated with the appearance of a population inversion between levels n=3 and 2. For the B=0 kG, zero field case, the maximum gain length product of kl≊3 (k≊6 cm-1) was measured for a carbon fiber coated with a thin layer of aluminum (for additional radiation cooling). The results are interpreted in terms of fast recombination due mostly to thermal conduction from the plasma to the cold fiber core.
ACCESSION #
9818614

 

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