TY - GEN
T1 - Single-mode instability and multi-mode instability of quantum-cascade lasers
AU - Bai, J.
AU - Zhou, D.
PY - 2010
Y1 - 2010
N2 - In this paper, we have reported the study on instability mechanisms of mid-infrared (MIR) quantum-cascade lasers (QCLs) with Fabry--Perot cavity. Both the saturable absorber (SA) and spatial hole burning (SHB) effects have been included in the analysis. We found that the single-mode and multi-mode instabilities can coexist in the quantum-cascade medium. The multi-mode instability has been observed to be similar to the coherent Risken - Nummedal - Graham - Haken (RNGH) instability, and the single-mode instability has been found to be associated with SHB effect. These results are different from those previously reported in the literature. The linear stability analysis is based on the linearization of Maxwell - Bloch formulism. There are two differences between our analysis and that presented in the literature. One difference lies in the treatment of the complex quantities, while the other is the algorithm for decoupling various instability mechanisms. Furthermore, we have also discussed about the effects of the saturable absorber on the two instability mechanisms. The saturable absorber effect can enhance both kinds of instabilities through lowering their instability thresholds, while the effect on the multi-mode instability is predicted to be more significant.
AB - In this paper, we have reported the study on instability mechanisms of mid-infrared (MIR) quantum-cascade lasers (QCLs) with Fabry--Perot cavity. Both the saturable absorber (SA) and spatial hole burning (SHB) effects have been included in the analysis. We found that the single-mode and multi-mode instabilities can coexist in the quantum-cascade medium. The multi-mode instability has been observed to be similar to the coherent Risken - Nummedal - Graham - Haken (RNGH) instability, and the single-mode instability has been found to be associated with SHB effect. These results are different from those previously reported in the literature. The linear stability analysis is based on the linearization of Maxwell - Bloch formulism. There are two differences between our analysis and that presented in the literature. One difference lies in the treatment of the complex quantities, while the other is the algorithm for decoupling various instability mechanisms. Furthermore, we have also discussed about the effects of the saturable absorber on the two instability mechanisms. The saturable absorber effect can enhance both kinds of instabilities through lowering their instability thresholds, while the effect on the multi-mode instability is predicted to be more significant.
KW - Multi-mode instability
KW - Quantum-cascade lasers
KW - Single-mode instability
UR - http://www.scopus.com/inward/record.url?scp=79951842954&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=79951842954&partnerID=8YFLogxK
U2 - 10.1109/NANO.2010.5697829
DO - 10.1109/NANO.2010.5697829
M3 - Conference contribution
AN - SCOPUS:79951842954
SN - 9781424470334
T3 - 2010 10th IEEE Conference on Nanotechnology, NANO 2010
SP - 815
EP - 820
BT - 2010 10th IEEE Conference on Nanotechnology, NANO 2010
T2 - 2010 10th IEEE Conference on Nanotechnology, NANO 2010
Y2 - 17 August 2010 through 20 August 2010
ER -