Generation of stable dual and/or multiple longitudinal modes emitted from a single quantum dot (QD) laser diode (LD) over a broad wavelength range by using volume Bragg gratings (VBG’s) in an external cavity setup is reported. The LD operates in both the ground and excited states and the gratings give a dual-mode separation around each emission peak of 5 nm, which is suitable as a continuous wave (CW) optical pump signal for a terahertz (THz) photomixer device. The setup also generates dual modes around both 1180 m and 1260 nm simultaneously, giving four simultaneous narrow linewidth modes comprising two simultaneous difference frequency pump signals.
- Bragg gratings
- laser diodes
- quantum-dot diode laster
Leyman, R., Nikitichev, D. I., Bazieva, N., & Rafailov, E. U. (2011). Multimodal spectral control of a quantum-dot diode laser for THz difference frequency generation. Applied Physics Letters, 99, . https://doi.org/10.1063/1.3654154