| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Room-Temperature Continuous-Wave Operation of a Tunable External Cavity Quantum Cascade Laser |
| ZHANG Jin-Chuan1, 2, WANG Li-Jun1**, LIU Wan-Feng1, LIU Feng-Qi1, YIN Wen1, LIU Jun-Qi1, LI Lu1, WANG Zhan-Guo1
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1Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083
2Department of Electronic Engineering, Tsinghua University, Beijing 100084
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| Cite this article: |
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ZHANG Jin-Chuan, WANG Li-Jun, LIU Wan-Feng et al 2011 Chin. Phys. Lett. 28 074203 |
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Abstract A room-temperature cw operation of a tunable external cavity (EC) quantum cascade laser (QCL) at an emitting wavelength of 4.6 µm is presented. Strain−compensation combined with two-phonon resonance in an active region design promises low threshold current density. A very low threshold current density of 1.47 kA/cm2 for an EC−QCL operated in cw mode is realized. Single-mode cw operation with a side-mode suppression ratio of 20 dB and a wide tuning range of over 110 cm-1 are achieved. Moreover, an even wider tuning range of over 135 cm−1 is obtained in pulsed mode at room temperature.
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| Keywords:
42.55.Px
42.60.Pk
42.60.Fc
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Received: 21 December 2010
Published: 29 June 2011
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| PACS: |
42.55.Px
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(Semiconductor lasers; laser diodes)
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42.60.Pk
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(Continuous operation)
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42.60.Fc
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(Modulation, tuning, and mode locking)
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