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  • low-threshold, high smsr tunable external cavity quantum cascade laser around 4.7μm

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 938
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
    room-temperature pulsed and continuous-wave (cw) operation of a tunable external cavity (ec) quantum cascade laser (qcl) at an emitting wavelength of 4.7μm was presented. the effect of different external cavity lengths and grating angles of the ec–qcl system were analyzed numerically. a wide tuning range greater than 131cm−1 was obtained in pulsed mode at room temperature. without the anti-reflection coating procedure, single-mode cw operation with a side-mode suppression ratio (smsr) above 20 db and a wide tuning range greater than 116cm−1 were achieved. near the center region, smsr about 30 db was also realized through designing the external cavity length. strain-compensation combined with two-phonon resonance in an active region design and the high-reflection coating promised low threshold current density. a record low threshold current density of 0.901ka/cm2 for an ec–qcl operated in cw mode was realized.

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