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Gain Measurement and Anomalous Decrease of Peak Gain at Long Wavelength for InAs/GaAs Quantum-Dot Lasers |
| XIAO Jin-Long1;HUANG Yong-Zhen1;DU Yun1;ZHAO Huan2;NI Hai-Qiao2;NIU Zhi-Chuan2 |
| 1State Key Laboratory on Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy of Sciences, PO Box 912, Beijing 1000832National Laboratory for Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, PO Box 912, Beijing 100083 |
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| Cite this article: |
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XIAO Jin-Long, HUANG Yong-Zhen, DU Yun et al 2007 Chin. Phys. Lett. 24 2984-2986 |
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Abstract Mode gain spectrum is measured by the Fourier series expansion method for InAs/GaAs quantum-dot (QD) lasers with seven stacks of QDs at different injection currents. Gain spectra with distinctive peaks are observed at the short and long wavelengths of about 1210nm and 1300nm. For a QD laser with the cavity length of 1060μm, the peak gain of the long wavelength first increases slowly or even decreases with the injection current as the peak gain of the short wavelength increases quickly, and finally increases quickly before approaching the saturated values as the injection current further
increases.
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| Keywords:
78.67.Hc
42.55.Px
42.60.Lh
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Received: 28 May 2007
Published: 20 September 2007
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| PACS: |
78.67.Hc
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(Quantum dots)
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42.55.Px
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(Semiconductor lasers; laser diodes)
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42.60.Lh
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(Efficiency, stability, gain, and other operational parameters)
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