Abstract
Modulation of a laser signal at radio frequencies ranging from 28 to 347 MHz is experimentally investigated by subjecting coherently emitting atoms of a Xe-He laser amplifier to simultaneous dc and RF magnetic fields. The sidebands are generated by a coherent nonlinear process that exhibits resonances when the Zeeman splitting of the laser levels equals the frequency of the magnetic field. A perturbational theory that is based on a simplified <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">(j = 1 \right arrow j = 0)</tex> atomic model adequately describes the dependence of the modulation efficiency on the dc magnetic field, the signal frequency, and atomic parameters. A presently unexplained phenomenon is the absence of the upper sideband.
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