Liu Junqi, Liu Fengqi, Li Lu, Shao Ye, Guo Yu and Wang Zhanguo
Abstract: Quasi-continuous wave lasing spectra of GaAs/A1GaAs quantum cascade lasers emitting at 9.76μm are characterized by step.scan time.resolved Fourier transform infrared spectroscopy.Pronounced self·pulsation in stacked emission spectra is observed in the driving current duration.Self·heating accumulation in the active region affects the electron relaxation and transport greatly.Thermally-induced carrier occupation of the higher sublevels in an injector can leak out through a resonant condition with the continuum states above the next injector，which will be facilitated by the fourth sublevel of the coupled quantum wells active region.The leaking process arising from the periodic breaking and recovering of resonant tunneling accounts for the physical mechanism of the selfpulsed effect in stacked emission spectra.
Key words: quantum cascade laser, self-pulsation, molecular beam epitaxy
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Received: 27 May 2016 Revised: Online: Published: 01 January 2007
| Citation: |
Liu Junqi, Liu Fengqi, Li Lu, Shao Ye, Guo Yu, Wang Zhanguo. Self-Pulsation Dynamics in GaAs/AIGaAs Quantum Cascade Lasers[J]. Journal of Semiconductors, 2007, 28(S1): 44-47.
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Liu J Q, Liu F Q, Li L, Shao Y, Guo Y, Wang Z G. Self-Pulsation Dynamics in GaAs/AIGaAs Quantum Cascade Lasers[J]. Chin. J. Semicond., 2007, 28(S1): 44.
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