Original Articles |
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Low-Threshold High-Temperature Operation of ~7.4μm Quantum Cascade Lasers |
LI Lu;LIU Feng-Qi;SHAO Ye;LIU Jun-Qi;WANG Zhan-Guo |
Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, PO Box 912, Beijing 100083 |
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Cite this article: |
LI Lu, LIU Feng-Qi, SHAO Ye et al 2007 Chin. Phys. Lett. 24 1577-1579 |
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Abstract We report low-threshold high-temperature operation of 7.4μm strain-compensated InGaAs/InAlAs quantum cascade lasers (QCLs). For an uncoated 22-μm-wide and 2-mm-long laser, the low-threshold current densities, i.e. 0.33kA/cm2 at 81K in pulsed mode and 0.64kA/cm2 at 84K in cw mode, are realized. High-temperature operation of uncoated devices, with a high value of 223K, is achieved in cw mode.
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Keywords:
42.55.Px
71.55.Eq
85.60.Bt
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Received: 15 February 2007
Published: 17 May 2007
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PACS: |
42.55.Px
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(Semiconductor lasers; laser diodes)
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71.55.Eq
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(III-V semiconductors)
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85.60.Bt
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(Optoelectronic device characterization, design, and modeling)
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