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Terahertz quantum cascade lasers with sampled lateral gratings for single mode operation
Dixiang Shao1, Chen Yao1, Zhanglong Fu1
1Key Laboratory of Terahertz Solid-State Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai, 200050, China.
Frontiers of Optoelectronics
|January 13, 2023
Summary
This study introduces single-mode terahertz quantum cascade lasers (THz QCLs) with sampled lateral gratings, achieving stable 3.4 THz emission. These lasers show improved power and stable single-mode operation, enhancing THz technology.
Area of Science:
- Optics and Photonics
- Semiconductor Devices
- Terahertz Technology
Background:
- Terahertz quantum cascade lasers (THz QCLs) are crucial for various applications, but achieving stable single-mode operation remains a challenge.
- Traditional distributed feedback gratings can limit performance and mode stability in THz QCLs.
Purpose of the Study:
- To develop and characterize single-mode THz QCLs utilizing a novel sampled lateral grating structure.
- To enhance the power output and mode stability of THz QCLs.
Main Methods:
- Fabrication of THz QCLs incorporating sampled lateral gratings.
- Characterization of emission spectra, power output, and far-field patterns.
- Comparison with devices featuring uniform distributed feedback gratings.
Main Results:
- Stable single longitudinal mode emission at approximately 3.4 THz was achieved.
- A side-mode suppression ratio exceeding 20 dB confirmed strong mode selection.
- Peak power was improved by approximately 11.8% compared to devices with uniform gratings.
- The far-field emission pattern remained unaffected by the grating structure.
Conclusions:
- Sampled lateral gratings are effective for achieving single-mode operation in THz QCLs.
- This grating design offers improved power performance and maintains desirable beam characteristics.
- The findings pave the way for more robust and efficient THz QCL devices.
