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Related Experiment Video

Updated: Mar 31, 2026

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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Sample Grating Distributed Feedback Quantum Cascade Laser Array.

F L Yan1, J C Zhang2, C W Liu3

  • 1Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, 100083, China. flyan2012@semi.ac.cn.

Nanoscale Research Letters
|October 18, 2015
PubMed
Summary

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This summary is machine-generated.

This study presents a tunable quantum cascade laser array achieving >35 dB side mode suppression and >10 mW output power. The novel design enables broad wavelength tunability for advanced infrared applications.

Area of Science:

  • Quantum optics and semiconductor lasers.
  • Infrared laser technology.
  • Materials science in optoelectronics.

Background:

  • Distributed feedback (DFB) quantum cascade lasers (QCLs) are crucial for mid-infrared applications.
  • Achieving broad tunability and high side mode suppression ratio (SMSR) simultaneously remains a challenge.
  • Existing QCL designs often compromise performance for specific wavelength ranges.

Purpose of the Study:

  • To develop a QCL array with enhanced tunability and superior SMSR.
  • To demonstrate single-mode emission across multiple wavelengths using a novel grating design.
  • To achieve practical room-temperature continuous-wave (CW) operation.

Main Methods:

  • Fabrication of a QCL array utilizing a sample grating with wavelength-dependent properties.
Keywords:
Patterned AlN submountQuantum cascade laser arraySample grating

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  • Implementation of an epitaxial side-down bonding technique for improved thermal management.
  • Characterization of laser performance including emission spectra, SMSR, and output power in CW mode.

    • Main Results:

    • The QCL array exhibited three distinct single-mode emissions centered at 4.760, 4.721, and 4.711 μm.
    • Achieved high side mode suppression ratios (SMSR) exceeding 35 dB.
    • Obtained continuous-wave (CW) output powers greater than 10 mW per laser ridge at room temperature.

    Conclusions:

    • The presented sample grating DFB QCL array successfully demonstrates broad tunability and high SMSR.
    • The device design and fabrication techniques are effective for achieving high-performance mid-infrared laser sources.
    • This work offers a promising platform for tunable laser sources in spectroscopy and sensing applications.