Abstract
A change in the resonance frequencies of the Fabry-Perot resonator of a GaAs laser diode with increasing pump current was detected and investigated. The value of ∂∊/∂N (∊ is the permittivity and N is the density of free electrons) was 2.6×10 cm−20 cm3 when the current density was 15 kA/cm2, temperature was 300°K, and wavelength was about 901 nm.
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