title: Comparative analysis of cavity length-dependent temperature sensitivity of GaInNAs quantum dot lasers and quantum well lasers.
abstract: Self-assembled GaInNAs/GaAsN single-layer quantum dot (QD) lasers, grown using solid source molecular beam epitaxy, have been fabricated and characterized. A high output power of 40.76 mW/facet was obtained from a GaInNAs QD laser with dimensions of 50 × 700 µm(2) at 10 °C. Temperature-dependent measurements were carried out on the GaInNAs QD lasers of different cavity lengths. For comparison, temperature-dependent measurements were also performed on GaInNAs single quantum well (SQW) and triple QW (TQW) lasers. Unlike the relationship between cavity length and T(0) in GaInNAs SQW/TQW lasers, longer-cavity GaInNAs QD lasers (50 × 1700 µm(2)) showed a lower T(0) of 65.1 K, which is believed to be due to non-uniformity of the GaInNAs QD layer. Furthermore, compared to GaInNAs SQW lasers, a significant improvement in temperature sensitivity was observed in the TQW GaInNAs lasers. This is attributed to a reduction in the relative contribution of the Auger recombination current and suppression of heavy-hole leakage in the TQW laser structures.
authors: School of Electrical and Electronic Engineering, Nanyang Technological University, Nanyang Avenue, Singapore 639798, Republic of Singapore.
authors: C Y
authors: CY
authors: Liu
authors: S F
authors: SF
authors: Yoon
authors: Q
authors: Q
authors: Cao
authors: C Z
authors: CZ
authors: Tong
authors: Z Z
authors: ZZ
authors: Sun