Observation of coherent resonance fluorescence in hot CO/sub 2/ Page: 2 of 12
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INTRODUCTION
Hot C02 has often been considered as an isolator for large, short-
pulse C02 laser systems because of the hot C02 line-to-line absorption
coincidences with the C02 laser transitions. SchappertI first showed
that in the absence of beam diameter reduction, hot C02 was unsuitable
because of its large saturation flux. Feldman, et.al.,2 showed that
hot C02 is a potentially attractive baseline precursor suppressor be-
cause of the difference in the bandwidth of the undesirable baseline
and the desirable short pulse. Feldman subsequently showed3 that by
reducing the beam diameter in the hot C02 (and therefore raising the
intensity) the effective saturation parameter of hot C02 could be re-
duced so that it would simultaneously behave as a practical saturable
absorber and as a pulse bandwidth-discriminating baseline suppressor.
ONE NANOSECOND PULSE RESULTS
Although hot C02 was originally considered for quarter-nanosecond
systems 2,3, we have elected to first check our theoretical understanding
by using the recently available one-nanosecond pulses from the Giga-
Watt Test Facility (GWTF) in TSL-85. The results reported here are in
relatively good agreement with theory. The experimental setup (as shown
in Fig. 1) is as follows: a one nanosecond duration 1/2 millijoule
switched-out pulse from the smoothing-tube stabilized GWTF oscillator
was directed through two heated pyrex' cells filled with C02 and fitted
with NaCl windows at Brewster's angle. The cells were 190 cm long of,i
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Czuchlewski, S. J.; Feldman, B. J.; Fisher, R. A. & Nowak, A. Observation of coherent resonance fluorescence in hot CO/sub 2/, article, January 1, 1976; New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc1410128/m1/2/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.