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Updated: Sep 13, 2025
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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
Published on: May 30, 2014
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High-power, high-wall-plug-efficiency quantum cascade lasers with high-brightness in continuous wave operation at
Manijeh Razeghi1, Yanbo Bai2, Feihu Wang2,3,4
1Center for Quantum Devices, Department of Electrical Engineering and Computer Science, Northwestern University, Evanston, IL, 60208, USA. razeghi@northwestern.edu.
Light, Science & Applications
|July 27, 2025
Summary
Quantum cascade lasers (QCLs) offer tunable mid-infrared and Terahertz emissions, overcoming traditional semiconductor laser limitations. This work details strategies for achieving high-power, high-efficiency QCLs for diverse applications.
Area of Science:
- Optoelectronics
- Quantum Physics
- Materials Science
Background:
- Quantum cascade lasers (QCLs) utilize unipolar inter-sub-band transitions, differing from traditional semiconductor lasers.
- QCLs overcome the bandgap-dependency limitation, enabling access to mid-infrared (mid-IR) and Terahertz (THz) spectral regions.
- QCLs are the leading light source technology for the mid-IR and THz regimes after 30 years of development.
Purpose of the Study:
- To present strategies and methodologies for high-performance QCLs.
- To achieve high-power, high-wall-plug-efficiency (WPE), and high-brightness QCLs.
- To enable room-temperature continuous-wave (cw) operation in the 3-300 μm range.
Main Methods:
- Development of novel QCL designs and fabrication techniques.
- Optimization of device structures for efficient inter-sub-band transitions.
- Characterization of laser performance including power, efficiency, and spectral properties.
Main Results:
- Demonstration of high-power, high-WPE QCLs operating at room temperature.
- Achieved continuous-wave (cw) operation across the 3-300 μm wavelength range.
- Significant advancements in intersubband laser technology.
Conclusions:
- QCLs are a mature and promising technology for mid-IR and THz applications.
- The presented strategies lead to significant improvements in QCL performance.
- Future research will continue to push the boundaries of QCL capabilities.
