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

作　　者：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 

机构地区：[1]Division of Quantum Materials and Devices,Bejing Academy of Quantum Information Sciences,Bejing 100193,China [2]Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Bejing 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

出　　处：《Light(Science & Applications)》2024年第10期2124-2130,共7页光（科学与应用)（英文版）

基　　金：supported by the National Natural Science Foundation of China(62274014,62235016);Bejing Municipal Science&Technology Commission(Z221100002722018).

摘　　要：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 subwavelength 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^(7)W sr^(-1)m^(-2)with near-diffraction-limited M2 factors of 1.4 in both vertical and lateral directions is achieved from a large device area of 1.6×1.6 mm^(2)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：WAVEGUIDE RESONATOR beam 

分 类 号：TN248[电子电信—物理电子学]