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Soviet Journal of Quantum Electronics

Modulation of the transmission of an atomic iodine switch

V. A. Gaǐdash, M. R. Mochalov, V I Shemyakin, V K Shurygin

Published Apr 30, 1978• 2 citations
Publisher

Abstract

A study was made of the active modulation of the transmission of an iodine switch based on the Zeeman effect. The switch was bleached in fields of the order of 2 kOe. The duration of the leading edge of the bleaching pulse was 200 nsec.
DOI
10.1070/qe1978v008n04abeh010074

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The physical basis of the operation of an atomic iodine passive switch (for iodine photodissociation lasers) is considered. Atomic iodine is obtained by thermal dissociation of I 2 . An experimental dependence of the switch transmission on the radiation intensity is reported; it is in satisfactory agreement with the theory. A weak-signal attenuation by a factor of ~ 100 is achieved for 70–80 % transmission of a saturating signal ( I ~5 × 10 8 W/cm 2 ). It is shown that a switch of this kind can be used as a decoupler in multistage amplifying systems.
An investigation was made of the properties of a two-component semiconductor (GaAs) medium and, specifically, of its transmission characteristics. It was found that the absorption coefficient was a nonlinear function of the power entering the medium. The "bleaching" theshold was determined. The spectral characteristics of the emission of a GaAs laser and of a GaAs amplifier–absorber system were determined. An experimental study was made of the reduction of the duration of the pulses transmitted by the amplifier–absorber system. Under traveling-wave conditions, the light pulses were compressed by a factor of up to 3 (down to 1 nsec). The experimental results were in agreement with the theoretical calculations.
The Zeeman effect of the B and R absorption lines of ruby was observed photographically with strong pulsed magnetic fields up to 230 kOe at 77°K. This was achieved by flashing a Xe-lamp at the time when a magnetic field reached its peak. The duration of the pulsed field was made to be about 1 m sec which was much longer than that of the pulsed light, about 20 µ sec. The g -values of the excited states responsible for the B and R lines were measured and the comparison was made with those reported by other authors. For the Zeeman patterns of the R lines with magnetic fields perpendicular to the optic axis, the Paschen-Back effect was calculated and compared with the observed patterns.