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The refractive index of GaAs, as measured by the prism refraction method, is reported here for photon energies from 0.7 eV up to the absorption limit set by the band gap, for temperatures of 300°, 187°, and 103°K. The results are compared with the previous data (obtained only for room temperature), and are used to show that the spacing of emission lines of GaAs lasers corresponds to that of the axial modes of a Fabry-Perot resonator.
D. T. F. Marple (Wed,) studied this question.