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ORNU 0-16
(To be submitted for publication in Journal of Applied Physics)
JUL 1 S 1964
MASTER
Laser Oscillation in He-Ne at 3.3902 4*
H. W. Morgan, F. A. Staats, P. M. Griffin,
K. L. Vander Sluis, and G. K. Werner
Oak Ridge rational Laboratory
Oak Ridge, Tennessee
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Studies of the Ne transition (3PL - 35,) at 3.3913 y, in laser
oscillation in a He-Ne discharge, have consistently shown a weuker
satellite oscillating at 3.3902 k. In using the 3.3913 w laser
radiation, where a prism or filter is used to suppress other laser
frequencies, it is important to recognize that the output may actually
consist of two frequencies. Ir. determining the spectrai slit width
or in the frequency calibration of infrared spectrophotometers, the
presence of the weaker peak could lead to erroneous results.
Simultaneous laser oscillation of these two frequencies has been
observed in rf and dc excited discharges, in tubes of 1 and 2 meter
lengths. The satellite line exhibits as much as 0.3 the intensity of
the 3.3913 u emission, and has been assigned to the Ne transition
(3P2 - 352). Since the separation of these two frequencies is
0.88 cm , the weaker peas may be observed only at the resolution of
WA
a grating spectrophotometer. The resolved doublet is shown in Fig.
1
.
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1, recorded on a Beckman IR-7 spectrophotometer in single beam
operation, with mechanical slit width of 45 H. Measurement of the
effective bandwidth of the spectrophotometer (bandwidth at half peak
intensity) gives a value of 0.29 + 0.02 cm .
*
Research sponsored by the U. S. Atomic Energy Commission under
contract with the Union Carbide Corporation.
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Both o: these transitions oscillate over the range 1.3 to 0.6
torr, anc with je-lie ratios Promo 15:1 to 2:1. In general, the satel-
lite shows hicher cein ai loäer pressures and stronger excitation.
Typical measurements tive :c: tre 3.3913 is transition a gain of 27 db
per motor oi discharce, ilu 202 the 3.3902 \ & Gain of about 0.5 db
per meter.
Thus by introducing süəficient attenuation into the cavity,
such as may be provided by Brewster windows of quartz, the satellite
cmission can be suppressed while maintaining useful power at 3.3913 ko
References
1. A. L. Bloom, W. E. Bell, wi H. E. Rempel, Applied Optics 3,
317 (1963). .
2. 4. W. Morgan, P. A. Staats, P. M. Gri fin, K. L. Vander Sluis,
and G. K. Werner, Ohio State Symposiwn on Molecular Structure
and Spectroscopy, Columous, Ohio (1953).
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Figure Caption
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Figure 1. He-ie Laser Emission at 3.39 H.
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This paper was submitted for publication
in the open literature at least 6 months
prior to the issuance date of this Micro-
card. Since the U.S.A.E.C. has no evi-
dence that it has been published, the pa-
per is being distributed in Microcard
form as a preprint.
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END


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