Carrier dynamics and lasing behavior of InAs/GaAs quantum dot lasers with short cavity lengths
- 13 October 2021
- journal article
- research article
- Published by IOP Publishing in Nanotechnology
- Vol. 33 (3), 035201
- https://doi.org/10.1088/1361-6528/ac2f5e
Abstract
The modulation p-doping technique has emerged as an effective way to optimize the carrier dynamics process of quantum dot (QD) structures. Here, the laser structures based on the 1.3 μm multiple-layer InAs/GaAs QD were fabricated with and without modulation p-doping. The carrier relaxation rate was increased after modulation p-doping, as demonstrated by transient absorption spectroscopy. The higher relaxation rate in p-doped QDs could be explained by more rapid carrier-carrier scattering process originating from increasing of the hole quasi-Fermi-level movement that increases the probability of occupancy of the valence states. In addition, the lasing behavior of Fabry-Perot lasers with and without modulation p-doping was investigated and compared. It was found that the ground state (GS) lasing in the absence of facet coating was successfully achieved in a p-doped laser diode with short cavity length (400 μm), which can be attributed to the higher GS saturation gain caused by p-doping. With assistance of a designed TiO2/SiO2 facet coating whose central wavelength (~1480 nm) is far beyond the lasing wavelength of 1310 nm, the GS lasing could be realized in a laser diode with short cavity lengths (300 μm) under continuous wave operation at room temperature, implying great potential for the development of low-cost and high-speed directly modulated lasers.Keywords
Funding Information
- National Natural Science Foundation of China (61875222)
- JiangXi Provincial Applied Research Training Program of China (20181BBE58020)
- China Postdoctoral Science Foundation funded project (2020M381729)
This publication has 41 references indexed in Scilit:
- Analytical approach to the multi-state lasing phenomenon in quantum dot lasersApplied Physics Letters, 2013
- 1.55 µm InAs/GaAs Quantum Dots and High Repetition Rate Quantum Dot SESAM Mode-locked LaserScientific Reports, 2012
- Delay of the excited state lasing of 1310 nm InAs/GaAs quantum dot lasers by facet coatingApplied Physics Letters, 2010
- Self-assembled quantum-dot superluminescent light-emitting diodesAdvances in Optics and Photonics, 2010
- Handling the heatNature Photonics, 2009
- High power temperature-insensitive 1.3 µm InAs/InGaAs/GaAs quantum dot lasersSemiconductor Science and Technology, 2005
- High-Performance Quantum-Dot Superluminescent DiodesIEEE Photonics Technology Letters, 2004
- Modulation characteristics of quantum-dot lasers: the influence of p-type doping and the electronic density of states on obtaining high speedIEEE Journal of Quantum Electronics, 2002
- Tunneling-injection quantum-dot laser: ultrahigh temperature stabilityIEEE Journal of Quantum Electronics, 2001
- InGaAs-GaAs quantum-dot lasersIEEE Journal of Selected Topics in Quantum Electronics, 1997