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Related Experiment Video

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Construction and Characterization of External Cavity Diode Lasers for Atomic Physics
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Low Power Consumption Substrate-Emitting DFB Quantum Cascade Lasers.

Chuan-Wei Liu1,2, Jin-Chuan Zhang3, Zhi-Wei Jia1,2

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

Nanoscale Research Letters
|September 4, 2017
PubMed
Summary
This summary is machine-generated.

Researchers developed an ultra-low power distributed feedback quantum cascade laser (DFB QCL). This novel DFB QCL achieves record-low threshold power dissipation, making it ideal for spectroscopy.

Keywords:
Low power consumptionQuantum cascade laserSubstrate-emitting

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Area of Science:

  • Optoelectronics
  • Quantum Engineering
  • Laser Physics

Background:

  • Quantum cascade lasers (QCLs) are crucial semiconductor devices for mid-infrared applications.
  • Reducing power consumption in QCLs is essential for portable and efficient spectroscopic systems.
  • Existing QCL designs often face limitations in power efficiency and operational stability.

Purpose of the Study:

  • To develop an ultra-low power consumption distributed feedback (DFB) quantum cascade laser (QCL).
  • To achieve record-low threshold power dissipation for continuous-wave (CW) operation.
  • To ensure stable single-mode emission over a wide temperature range for practical applications.

Main Methods:

  • Fabrication of a substrate-emitting DFB QCL with a shortened cavity length (0.5 mm).
  • Application of high-reflectivity (HR) coating on both laser facets.
  • Integration of a buried second-order grating for single-mode emission control.

Main Results:

  • Achieved a record-low CW threshold power dissipation of 0.43 W at 25°C.
  • Demonstrated stable, mode-hop-free single-mode emission from 15°C to 105°C.
  • Obtained a maximum CW optical output power of 2.4 mW at 25°C, suitable for spectroscopy.

Conclusions:

  • The developed DFB QCL offers unprecedented low power consumption for QCLs.
  • The device exhibits excellent temperature stability and single-mode performance.
  • This ultra-low power QCL is a promising candidate for advanced spectroscopy and sensing applications.