A5011943043- Terahertz technology and applications
- Photonic and Optical Devices
- Spectroscopy and Laser Applications
- Superconducting and THz Device Technology
- Digital Holography and Microscopy
- Statistical Methods and Inference
- Advanced X-ray Imaging Techniques
- Gyrotron and Vacuum Electronics Research
- Statistical Methods and Bayesian Inference
- Laser-Plasma Interactions and Diagnostics
- Plant and animal studies
- Sparse and Compressive Sensing Techniques
- Gene expression and cancer classification
- Probabilistic and Robust Engineering Design
- Advanced Statistical Methods and Models
- Photorefractive and Nonlinear Optics
- Advanced Fiber Laser Technologies
- Semiconductor Quantum Structures and Devices
- Control Systems and Identification
University of Science and Technology of China
2021-2024
Laser Fusion Research Center
2016-2023
Laser Research Institute
2016-2023
China Academy of Engineering Physics
2019-2022
We demonstrate high-resolution and high-quality terahertz (THz) in-line digital holography based on the synthetic aperture method. The setup is built a self-developed THz quantum cascade laser, lateral resolution better than 70 μm (∼λ) achieved at 4.3 THz. To correct intensity differences between sub-holograms before stitching, practical algorithm with global optimization proposed. address twin-image problem for holography, sparsity-based phase retrieval applied to perform reconstruction....
We demonstrate the enhancement of resolution and image quality in terahertz (THz) lens-free in-line digital holography by sub-pixel sampling with double-distance reconstruction. Multiple shifted low-resolution (LR) holograms recorded a pyroelectric array detector (100 μm × 100 pixel pitch, 124 pixels) are aligned precisely to synthesize high-resolution (HR) hologram. By this method, lateral is no more limited 150 obtained, which corresponds 1.26λ respect illuminating wavelength 118.8 (2.52...
We demonstrate terahertz (THz) lens-free in-line holography on a chip in order to achieve 40 μm spatial resolution corresponding ~0.7λ with numerical aperture of ~0.87. believe that this is the first time sub-wavelength THz and were both far better than what was already reported. The setup based self-developed high-power continuous wave laser at 5.24 (λ = 57.25 μm) high-resolution microbolometer detector array (640 × 512 pixels) pitch 17 μm. This on-chip holography, however, suffers from...
We demonstrate subwavelength resolution, full-field, and lensless terahertz ptychography via longitudinal shifts of the sample. An extended illumination is adopted to realize full-field recording. Compared a typical scheme, this implementation requires fewer diffraction patterns, which improves imaging throughput. To suppress incoherent infrared background, an optical chopper introduced preprocessing algorithm based on digital phase-locked proposed. By combining ideas multi-plane phase...
We have studied the seed enhancement of an injection-seeded terahertz (THz)-wave parametric generator (is-TPG) with help a theoretical model. During simulation, power beam varied from 1 W to MW as initial condition, while pump is set 18.5 MW. When peak reaches megawatt level, output THz wave increases rapidly and position for dramatically moves towards front crystal. The calculated injection-pulse-seeded TPG (ips-TPG) 0.3 pulsed 3.4 kW in case surface-emitting configuration 14 Si-prism...
We present a numerical method to model the nonlinear optical up-conversion in terahertz (THz) parametric process. Specifically, we introduce concept of competition between spontaneous down-conversion (SPDC) idler beam and up-converted Stokes beam. simulate spectra with absolute power each frequency component that clearly shows result. By this method, theoretically explain suppression effect injected signal on SPDC background. also verify simulation experimentally by using an detection...
We report on the implementation of a confocal microscopy system based an injection-seeded terahertz parametric generator working at 1.76 THz. The has fairly reliable long-term stable operation with pulse energy fluctuations <5 % . experimentally demonstrate subwavelength lateral resolution 158 μm, corresponding to 0.93λ. also capability resolving overlapping objects different longitudinal surfaces by imaging designed sample. This is first detailed demonstration THz source, which helpful for...
Abstract The literature has witnessed an upsurge of interest in model selection diverse fields and optimization applications. Despite the substantial progress, remains a significant challenge when covariates are highly correlated, particularly within economic financial datasets that exhibit cross‐sectional serial dependency. In this paper, we introduce novel methodology named factor augmented regularized with weak factors (WeakFARM) for generalized linear models presence correlated latent...
Sparse modeling plays a ubiquitous role in modern statistical regression. In particular, high-dimensional survival analysis has drawn lot of attention as result the popularity microarray studies involving data. this paper, we focus on scenario where predictors are strongly correlated, also known grouping effect, which is highly desirable when analysing To perform simultaneous variable selection and estimation under circumstance, propose l2-regularized best-subsets estimator framework...
Two primary concerns of inference for high-dimensional data are statistical accuracy and computational efficiency. Despite the appealing asymptotic properties existing de-biasing methods, step is generally considered to be computationally intensive. In this article, we propose constrained projection estimator (CPE) deriving confidence intervals in a scalable efficient way under high dimensions when unknown parameters adopt an approximately sparse structure. The proposed method implemented on...