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High Efficiency, Low Power-Consumption DFB Quantum Cascade Lasers Without Lateral Regrowth.

Zhi-Wei Jia1,2, Li-Jun Wang3,4, Jin-Chuan Zhang1

  • 1Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, Key Laboratory of Low Dimensional Semiconductor Materials and Devices, Beijing, 100083, China.

Nanoscale Research Letters
|April 21, 2017
PubMed
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New distributed feedback (DFB) quantum cascade lasers (QCLs) achieve ultra-low power consumption. These novel DFB QCLs demonstrate efficient continuous wave operation at high temperatures, paving the way for energy-efficient mid-infrared applications.

Area of Science:

  • Optoelectronics
  • Semiconductor Lasers

Background:

  • Quantum cascade lasers (QCLs) are crucial for mid-infrared applications.
  • Low power consumption and high-temperature operation remain key challenges for QCLs.

Purpose of the Study:

  • To fabricate and characterize very low power-consumption distributed feedback (DFB) quantum cascade lasers (QCLs) around 4.9 μm.
  • To achieve efficient continuous wave (CW) operation at elevated temperatures.

Main Methods:

  • Fabrication using a conventional process without lateral regrowth or sidewall gratings.
  • Optimization of materials and waveguide design to minimize loss.
  • Integration with partial-high-reflection coating.

Main Results:

  • Achieved a very low threshold current density of 0.5 kA/cm² for a 2-mm-long device.
Keywords:
Distributed feedbackHigh efficiencyLow power-consumptionQuantum cascade laser

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  • Demonstrated CW operation up to 105 °C for a 1-mm-long DFB QCL.
  • Obtained a maximum CW output power of over 110 mW at 15 °C and 35 mW at 105 °C.
  • Deduced high wall-plug efficiency (5.5%) and slope efficiency (1.8 W/A) at 15 °C.

    • Conclusions:

    • The developed DFB QCLs offer significantly reduced power consumption.
    • The devices exhibit robust performance at high temperatures, suitable for practical applications.
    • This work advances the development of efficient and compact mid-infrared laser sources.