Abstract
An experimental investigation was made of the dependence of the coherence length of the radiation emitted from single-frequency GaAs injection lasers on the radiation power and intensity. For intensities of ~0.5×105 W/cm2 the emission line became considerably broader. The dependence of the coherence length on the radiation power in the weak-field regime, i.e., for intensities I105 W/cm2, was used to estimate the upper value of the saturation parameter. The results were in good agreement with the corresponding theoretical predictions.
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