National Research Council of Canada. NRC Institute for Microstructural Sciences
We present an experimental investigation of the optical gain properties of 1.3 μm GaInNAs double quantum well ridge waveguide laser diodes. High-resolution gain spectra versus injection current and temperature were obtained by measuring the modulation depth introduced into the spontaneous emission spectrum by the Fabry-Pérot resonances. As the injection current increases, the modal gain spectral peak experiences a small blueshift over the photon energy, and the magnitude increases asymptotically, saturating at the lasing threshold level of 24.4 cm−1. The peak of the modal gain spectra exhibits a redshift with an average rate of 0.58 nm/°C as the temperature increases from 30 to 50°C. For wavelengths corresponding to photon energy below the band gap, the modal gain spectra converge to the internal loss of 7 cm−1. The full width at half maximum of the gain spectrum is 41.1 meV at 30°C, 40 mA and increases with injection current at a rate of 0.42 meV/mA. The high optical gain and low internal loss indicate that GaInNAs is a promising active material for long wavelength laser diodes.
Journal of vacuum science and technology A24, no. 3 (May 2006): 787–790.