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Stable single-mode operation of distributed feedback quantum cascade laser under high current via a grating reflector
Fan Ye1, Fengmin Cheng2, Zhiwei Jia2
1School of Electronic Science and Engineering Nanjing University, Nanjing, Jiangsu 210093, People's Republic of China.
Nanophotonics (Berlin, Germany)
|December 5, 2024
Summary
We developed distributed feedback quantum cascade lasers (DFB QCLs) using grating reflectors for enhanced single-mode stability. These lasers show precise wavelength control and high output power, suitable for tunable applications.
Area of Science:
- Quantum electronics
- Semiconductor lasers
Background:
- Distributed feedback (DFB) quantum cascade lasers (QCLs) are crucial for various applications.
- Achieving high single-mode stability and precise wavelength control in QCLs remains a challenge.
Purpose of the Study:
- To report on index-coupled DFB QCLs with high single-mode stability using grating reflectors (GR).
- To investigate the performance of QCLs fabricated with equivalent phase shift (EPS) or sampled Moiré grating (SMG) structures.
Main Methods:
- Fabrication of QCLs utilizing EPS-GR and SMG-GR structures.
- Characterization of emission wavelength precision and side-mode-suppression-ratio (SMSR).
- Investigation of QCL arrays incorporating semi-insulated InP (Fe) for improved performance.
Main Results:
- EPS-GR and SMG-GR QCLs exhibited high emission wavelength precision and an SMSR of 24.5 dB.
- Significant output power was achieved, even at the edge of the gain spectrum.
- QCL arrays with semi-insulated InP (Fe) showed lower threshold current and higher output power.
Conclusions:
- The developed GR-based QCLs offer superior single-mode stability and precise wavelength control.
- These QCLs demonstrate considerable output power and potential for wide tunability.
- The findings suggest these QCLs are promising for applications demanding stable, tunable single-mode emission.
