Abstract
Measurements of the absorption in the temperature range 1.8–9 K have been made for wavelengths between 3.1 and 4.2μm, in germanium highly excited by a 1.06μm laser. The shape of the absorption curve is noted to be similar to that observed by Pokrovskii and Svistunova at lower excitation levels, and somewhat broader than that calculated by Smith, Chen and McGill for exciton absorption. A cross section of 4.5 (±1.1) × 10 -17 cm 2 at 3.39μm is deduced from normalization with the theoretical curves of Smith et al.
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