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Soviet Journal of Quantum Electronics

Characteristics of the stimulated emission from iodine atoms in pulsed magnetic fields

Белоусова Инна Михайловна, B D Bobrov, Valery M. Kiselev, V N Kurzenkov

Published Jun 30, 1974• 6 citations
Publisher

Abstract

An investigation was made of the influence of pulsed magnetic fields on the characteristics of the stimulated radiation resulting from the 2 P 1/2 – 2 P 3/2 transition in iodine atoms. It was found that pulsed magnetic fields could be used to modulate the gain and the output power of this iodine laser.
DOI
10.1070/qe1974v004n06abeh009321

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An investigation was made of the characteristics of stimulated emission of short light pulses in a transverse magnetic field. Conditions for simultaneous emission at two frequencies corresponding to the F'=3F=4 and F'=2→F=2 transitions. In magnetic fields of 0–800 Oe intensity the frequencies of the σ Zeeman components of the above 3–4 and 2–2 transitions coincided with the central frequencies of the corresponding transitions in the luminescence spectrum of atomic iodine in the absence of a magnetic field.
It is shown that the stimulated emission cross section σ 3—4 of the 2 P 1/2 ( F =3)→ 2 P 3/2 ( F' =4) transition in iodine can be determined without allowance of the influence of chemical reactions on the population inversion and mixing of sublevels with the ground 2 P 3/2 and excited 2 P 1/2 states of iodine. A report is given of measurements of the σ 3—4 cross section as a function of the pressure of CF 3 I, n -C 3 F 7 I, and i -C 3 F 7 I vapors and of He, Ne, Ar, and Xe inert gases. The collisional (impact) widths of the transition profile and of the coefficients of collisional broadening by these gases are obtained. A comparison is made with the theory and with the results of published investigations.
Optical absorption cross sections and the fluorescent quantum efficiency in ruby have been determined. This data has been used to correlate calculations with the analysis of the preceding paper. Stimulated emission from ruby under pulsed excitation has been studied in some detail; the observations are found to depend strongly on the perfection of the particular crystal under study. A peak power output of approximately 5 kw, total output energy of near 1 joule, beam collimation of less than ${10}^{\ensuremath{-}2}$ rad, and a spectral width of individual components in the output radiation of about 6\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}4}$A at 6943 A have been measured. It is suggested that mode instabilities due to temperature shifts and a time-varying magnetic field are contributing to an oscillatory behavior of the output pulse.