Abstract:
The results of measurements of optical loss in semiconductor ridge lasers are presented. The InGaAs/AlGaAs/GaAs single-quantum-well semiconductor lasers are studied in the spectral range from 1019 to 1042 nm, which corresponds to the long wavelength wing of the mode gain curve. It is shown that the dominant mechanism of optical loss appears to be light scattering by optical inhomogeneities of the laser waveguide, while the free-carrier absorption is negligible in the lasers studied.