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Related Experiment Video

Updated: May 14, 2026

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
09:38

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

Published on: December 18, 2015

High performance terahertz quantum cascade laser sources based on intracavity difference frequency generation.

Q Y Lu1, N Bandyopadhyay, S Slivken

  • 1Center for Quantum Devices, Department of Electrical Engineering and Computer Science, Northwestern University, Evanston, IL 60208, USA.

Optics Express
|February 8, 2013
PubMed
Summary

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High-brightness LWIR quantum cascade lasers.

Optics letters·2021

We achieved high-power, room-temperature terahertz (THz) emissions using quantum cascade lasers. This breakthrough enhances THz generation efficiency and tunability for advanced applications.

Area of Science:

  • Optics and Photonics
  • Quantum Electronics
  • Terahertz Science

Background:

  • Quantum cascade lasers (QCLs) are crucial for generating coherent light.
  • Mid-infrared (MIR) QCLs offer a platform for various nonlinear optical processes.
  • Intracavity difference frequency generation (DFG) is a method for generating light at new frequencies.

Purpose of the Study:

  • To demonstrate high power, room-temperature, single-mode terahertz (THz) emissions.
  • To enhance THz power and conversion efficiency using dual active regions.
  • To achieve lithographic tuning of THz frequency.

Main Methods:

  • Utilizing intracavity difference frequency generation (DFG) in mid-infrared quantum cascade lasers (QCLs).
  • Employing dual active regions with giant nonlinear susceptibilities.

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Related Experiment Videos

Last Updated: May 14, 2026

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
09:38

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

Published on: December 18, 2015

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
10:17

20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier

Published on: July 12, 2017

  • Integrating dual-period distributed feedback (DPFB) gratings for frequency tuning.

    • Main Results:

    • Achieved single-mode THz emissions from 3.3 to 4.6 THz.
    • Obtained high output power up to 65 µW with a side-mode suppression ratio (SMSR) of 40 dB.
    • Demonstrated a narrow linewidth of 5 GHz, indicating high spectral purity.

    Conclusions:

    • The developed QCL-based THz source provides high power and precise frequency control.
    • The dual active region and DPFB grating design significantly enhance THz generation performance.
    • This technology is promising for applications requiring tunable, high-power THz radiation.