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
1Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083 2Department of Electronic Engineering, Tsinghua University, Beijing 100084
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
1Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083 2Department of Electronic Engineering, Tsinghua University, Beijing 100084
摘要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.
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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2011, Vol. 28 
