High brightness terahertz quantum cascade laser with near-diffraction-limited Gaussian beam

Rusong Li; Yunfei Xu; Shichen Zhang; Yu Ma; Junhong Liu; Binru Zhou; Lijun Wang; Ning Zhuo; Junqi Liu; Jinchuan Zhang; Shenqiang Zhai; Shuman Liu; Fengqi Liu; Quanyong Lu

doi:10.1038/s41377-024-01567-2

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High brightness terahertz quantum cascade laser with near-diffraction-limited Gaussian beam

Original Articles

- High brightness terahertz quantum cascade laser with near-diffraction-limited Gaussian beam
- Light: Science & Applications Vol. 13, Issue 10, Pages: 2124-2130(2024)
- Affiliations：
  
  1.Division of Quantum Materials and Devices, Beijing Academy of Quantum Information Sciences, Beijing 100193, China
  2.Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  3.School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
  4.Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
- Author bio：
  
  Lijun Wang (ljwang@semi.ac.cn)
  Quanyong Lu (luqy@baqis.ac.cn)
- Funds：
- DOI：10.1038/s41377-024-01567-2
  CLC：
- Received：26 February 2024，
  
  Revised：30 July 2024，
  
  Accepted：2024-08-06，
  
  Published Online：16 August 2024，
  
  Published：31 October 2024
- Accepted：
Scan QR Code
Li, R. S. et al. High brightness terahertz quantum cascade laser with near-diffraction-limited Gaussian beam. Light: Science & Applications, 13, 2124-2430 (2024).
DOI：

Li, R. S. et al. High brightness terahertz quantum cascade laser with near-diffraction-limited Gaussian beam. Light: Science & Applications, 13, 2124-2430 (2024). DOI： 10.1038/s41377-024-01567-2.

摘要

Abstract

High-power terahertz (THz) quantum cascade laser

as an emerging THz solid-state radiation source

is attracting attention for numerous applications including medicine

sensing

and communication. However

due to the sub-wavelength confinement of the waveguide structure

direct beam brightness upscaling with device area remains elusive due to several mode competition and external optical lens is normally used to enhance the THz beam brightness. Here

we propose a metallic THz photonic crystal resonator with a phase-engineered design for single mode surface emission over a broad area. The quantum cascade surface-emitting laser is capable of delivering an output peak power over 185 mW with a narrow beam divergence of 4.4° × 4.4° at 3.88 THz. A high beam brightness of 1.6 × 10

W sr

−1

−2

with near-diffraction-limited M

factors of 1.4 in both vertical and lateral directions is achieved from a lar

ge device area of 1.6 × 1.6 mm

without using any optical lenses. The adjustable phase shift between the lattices enables a stable and high-intensity surface emission over a broad device area

which makes it an ideal light extractor for large-scale THz emitters. Our research paves the way to high brightness solid-state THz lasers and facilitates new applications in standoff THz imaging

detection

and diagnosis.

关键词

Keywords

references

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