Observation of coherent resonance fluorescence in hot CO/sub 2/ Page: 3 of 12
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-2-
which 160 cm were heated to 300 + 100 C for a total heated path of 320 cm.
Temperatures were measured with three chromel-alumel thermocouples on
each cell. The 1 ns pulse clipper consisted of a CdTe crystal (8 mm x
8 mm x 4 cm) switched by a 13 - 16 kv pulse from a laser-triggered
spark gap. The resulting pulses were detected by a Molectron P5-00
pyroelectric det-ctor, and signals were recorded on a Tektronix 7904
oscilloscope.
Figure 2 shows typical results. Note the growth of the second
peak as the C02 pressure is increased. Even at zero torr hot C02
there is a second peak; this is merely ringing in the 7904. This
ringing was subtracted from each picture before evaluating the ringing
due to the hot C02. Figure 3 shows the measured corrected ratio of
the second peak to the first peak as a function of hot C02 pressure.
This figure indicates what has already been known; that in the linear
regime one must use low C02 pressures to reduce the undesired secondary
ringing. Unfortunately, ct these reduced pressures the baseline re-
jection will be only slight since cr0t, the absorption coefficient
times cell length, is small (0.554/torr up to 5 torr). The calculated
baseline reduction factor (e- at) is shown in Fig. 4. Note that
adequate baseline reduction is not available at low pressures. This
is why hot C02 operating as a linear filter was not proposed for one
nanosecond systems; good baseline rejection and lack of ringing are
incompatible for one nanosecond pulse durations.
Saturation of either the hot C02 or the subsequent amplifier
chain will reduce the secondary ringing. Although the pulse did
not have enough energy to saturate the entire sample length of C02,
we telescoped the beam diameter down to see if any evidence of hot
C02 saturation could be obtained; our results showed only a slight
reduction of the second peak. The testing of saturated operation
of hot C02 at one nanosecond will be addressed in a future experiment.
170 PICOSECOND RESULTS - PULSE COMPRESSION IN SF6
To test the effects of hot CO; on pulses shorter than one nano-
second, we were first tempted to use the ultrashort pulses generated
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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/m1/3/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.