Abstract:
Dual-frequency oscillation is obtained and investigated in a new type of injection heterolaser, an interband two-stage cascade laser with a tunneling $p$–$n$ junction separating two active regions with quantum wells located in a common waveguide. The laser design provides for simultaneous oscillation at the first-order TE mode of wavelength $\lambda$ = 1.086 $\mu$m and the second-order TE mode of wavelength $\lambda$ = 0.96 $\mu$m in the continuous-wave regime at room temperature.