Two-photon optically pumped molecular gas visible laser. [Ammonia] Page: 2 of 11

A TWO-PHOTON OPTICALLY PUMPED MOLECULAR GAS VISIBLE LASER

by
C. R. Quick, Jr., J. H. Glownia, J. J. Tiee and F. L. Archuleta
The University of California
Chemistry Division
Los Alamos National Laboratory
P. 0. Box 1663
Los Alamos, New Mexico 87545
ABSTRACT
Recent investigations of the multiphoton ionization (MPI) spectrum of
gaseous ammonia have led to the discovery of a novel two-photon pumped mole-
cular gas electronic transition laser. Resonant, two-photon electronic
excitation of NH3 in the near uv (-305 nm) leads to the first observation of
fluorescence from NH3 excited states (B and C'), and, at higher pressures,
to lasing action (-570 nm) between numerous C' and A state vibronic levels.
A frequency-doubled Nd:YAG pumped dye laser (a few mJ) is focused into a cell
containing NH3 (or ND3), Stimulated emission is observed in the forward and
backward directior at NH3 pressures greater than -200 torr, without external
mirrors to provide feedback. Conversion efficiencies (output NH3 pulse
energy/input pulse energy) as high as 2% have been observed.
*
Work performed under the auspices of US DOE.
DISCLAIMER
This report was prepared as an account of work sponsored by an agency of the United States
Government. Neither the United States Government nor any agency thereof, aor any of their
employees, makes any warranty, express or implied, or assumes any legal liability or reponsi-
hility for the accuracy, completeness, or usefulness of any information, apparatus, product, or
process disclosed, or represents that its use would not infringe privately owned rights, Refer-
ence herein to any specific commercial product, process, or service by trade name, trademark,
manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recomw
mendation, or favoring by the United States (iuvernment or any agency thereof. The v ews
and opinions of authors exprised herein do not necessarily state or reflect those of the
United States Government or any agency thereof, 01sm ul W

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Quick, C.R. Jr.; Glownia, J.H.; Tiee, J.J. & Archuleta, F.L. Two-photon optically pumped molecular gas visible laser. [Ammonia], article, January 1, 1983; New Mexico. (digital.library.unt.edu/ark:/67531/metadc1110570/m1/2/ocr/: accessed January 21, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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