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Fast Swept-Wavelength, Low Threshold-Current, Continuous-Wave External Cavity Quantum Cascade Laser.

Xuefeng Jia1,2, Lijun Wang3,4, Zhiwei Jia1,2

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

Nanoscale Research Letters
|October 28, 2018
PubMed
Summary

We developed a fast, wavelength-tuning external cavity quantum cascade laser (EC-QCL) with a low threshold current. This tunable laser offers rapid scanning and high resolution for various applications.

Keywords:
External cavityFast swept-wavelengthQuantum cascade laser

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Area of Science:

  • Quantum Cascade Lasers
  • Mid-Infrared Photonics
  • Spectroscopy Instrumentation

Background:

  • External cavity quantum cascade lasers (EC-QCLs) are crucial for tunable mid-infrared light generation.
  • Existing EC-QCLs often face limitations in tuning speed, threshold current, or resolution.
  • Advancements are needed to enhance the performance of EC-QCLs for broader applicability.

Purpose of the Study:

  • To design and demonstrate a novel external cavity quantum cascade laser (EC-QCL) with enhanced wavelength-tuning capabilities.
  • To achieve a low threshold current and high scan rate for rapid spectral measurements.
  • To evaluate the spectral resolution and power output of the developed EC-QCL.

Main Methods:

  • Utilized a Littman-Metcalf cavity geometry incorporating a scanning galvanometer for wavelength tuning.
  • Employed a quantum cascade laser (QCL) gain chip of 3-mm length.
  • Implemented sawtooth wave modulation for precise wavelength scanning and resolution enhancement.

Main Results:

  • Achieved a wide tuning range of approximately 290 nm (2105 cm⁻¹ to 2240 cm⁻¹).
  • Demonstrated a fast scan rate of 59.3 μm/s at a repetition rate of 100 Hz.
  • Recorded a low continuous-wave (CW) threshold current of 250 mA and a maximum output power of 20.8 mW.
  • Attained a spectral resolution better than 0.2 cm⁻¹ within the tuning range.

Conclusions:

  • The developed EC-QCL exhibits a low threshold current and fast wavelength tuning, making it suitable for demanding applications.
  • The high scan rate and resolution enable rapid and precise spectroscopic measurements.
  • This technology holds promise for applications requiring fast, tunable mid-infrared light sources.