We focused on the effects of group-velocity dispersion (GVD) on the coherent pulse progression in mid-infrared (MIR) quantum-cascade lasers (QCLs). Comparison of GVD effects on the two kinds of typical QCL cavities, i.e., FP and ring cavities, brings insight into the interaction between the GVD and the spatial hole burning (SHB) effect which is only supported by FP cavities but not ring cavities. The theoretical model is built based on the Maxwell-Bloch formulism accounting for two-way propagations of electric field and polarization as well as the couplings among the electric field, the polarization, and the population inversion. The pulse evolution in time-spatial domains is simulated by the finite difference method with prior nondimensionalization, which is necessary for a convergent solution. Results predict that the SHB could broaden the QCL gain bandwidth and induce additional side modes closely around the central lasing mode with an intensity more pronounced than that of GVD associated side modes. Moreover, owing to the SHB, the lasing instability caused by GVD is weaker in a FP cavity than a ring cavity.
|Original language||English (US)|
|Title of host publication||Physics and Simulation of Optoelectronic Devices XXVII|
|Editors||Bernd Witzigmann, Yasuhiko Arakawa, Marek Osinski|
|State||Published - 2019|
|Event||Physics and Simulation of Optoelectronic Devices XXVII 2019 - San Francisco, United States|
Duration: Feb 5 2019 → Feb 7 2019
|Name||Proceedings of SPIE - The International Society for Optical Engineering|
|Conference||Physics and Simulation of Optoelectronic Devices XXVII 2019|
|Period||2/5/19 → 2/7/19|
Bibliographical noteFunding Information:
Jing Bai’s research is partially supported by the National Science Foundation (NSF) Grant No. ECCS-1232273. Hanquan Wang's research is partially supported by Natural Science Foundation of China under grant Nos. 11261065 and 91430103.
Jing Bai's research is partially supported by the National Science Foundation (NSF) Grant No. ECCS-1232273. Hanquan Wang's research is partially supported by Natural Science Foundation of China under grant Nos. 11261065 and 91430103.
© 2019 SPIE.
- Dispersive media
- Laser dynamics
- Midinfrared quantum-cascade lasers
- Spatial hole burning