A5028699631- Optical measurement and interference techniques
- Advanced optical system design
- Optical Systems and Laser Technology
- Adaptive optics and wavefront sensing
- Advanced Optical Sensing Technologies
- Solid State Laser Technologies
- Advanced X-ray Imaging Techniques
- Advanced Measurement and Metrology Techniques
- Laser-Plasma Interactions and Diagnostics
- Surface Roughness and Optical Measurements
- Infrared Target Detection Methodologies
- Railway Engineering and Dynamics
- Nonlinear Optical Materials Research
- Plant Molecular Biology Research
- Laser-Matter Interactions and Applications
- Laser Material Processing Techniques
- Welding Techniques and Residual Stresses
- Crystallography and Radiation Phenomena
- Advanced Measurement and Detection Methods
- Adsorption and biosorption for pollutant removal
- Chromosomal and Genetic Variations
- Brake Systems and Friction Analysis
- Calibration and Measurement Techniques
- Vibration and Dynamic Analysis
- Optical Polarization and Ellipsometry
Nanjing University of Aeronautics and Astronautics
2019-2023
Ministry of Industry and Information Technology
2021
Laser Research Institute
2019
China Academy of Engineering Physics
2017-2018
Jingchu University of Technology
2013-2018
Dalian University of Technology
2014-2015
A study of a train moving along cable-stayed bridge is performed by considering both the stationary track irregularity and non-stationary earthquake. detailed model with 3972 degrees freedom established while consists two locomotives eight carriages. The equations motion coupled system are obtained using displacement continuous condition at contact, irregularities. earthquake assumed to occur once has entered bridge. pseudo-excitation method used find random responses system, results...
Infrared (IR) small target detection, especially in a complex background, continues to present challenges the low false alarm rate and high robustness. In this paper, background subtraction local contrast measure (BSLCM) Gaussian structural similarity (GSS) integrated model is proposed detect IR target. model, BSLCM used suppress enhance GSS calculation conducted eliminate high-brightened residual noise further. To evaluate performance of method, real sequences seven state-of-the-art (SOTA)...
Large-size DKDP crystals are grown by conventional-growth (CG) and rapid-growth (RG) methods their deuterium homogeneities measured in situ Raman spectroscopy. The influence of homogeneity on third harmonic generation (THG) is also researched. results indicate that the CG crystal good content (0.005% cm−1 deviation along e-axis) its can be neglected, while RG shows a more complicated distribution content. Its decreases gradually, about 0.2% per cm with growing, which will lead to 5%...
Aspherical surfaces can provide significant benefits to a wide variety of optical systems, but manufacturing high-precision aspherical has historically been limited by the ability measure them. Null testing always ideal method in measurement. However, many cases, it is hard realize null for complex surfaces, especially convex complicated forms. In this paper, we propose hybrid compensation combining spherical mirror and computer generated hologram (CGH) achieve surface. Firstly, introduce...
Ship detection under small temperature difference conditions is an important research direction for infrared (IR) of typical targets at present. To solve the problems low contrast and difficult recognition ship IR imaging due to differences, degree polarization (DOP) images applied field low-temperature aberration based on principle. Meanwhile, misalignment problem caused by lens jitter in calculation solved proposed mutual information iterative algorithm. We demonstrate improvement...
The annular subaperture stitching method is an effective for testing rotationally symmetric aspherical surfaces. To create a full aperture map of this kind asphere, we propose algorithm. algorithm based on triangulation interpolation theory, least-square fitting method, and ray tracing method. We first show the principle our Then, performance proposed analyzed by simulation to evaluate accuracy above In end, experiment given demonstrate correctness Both results that introduced quite
Rapid grown KDP and DKDP crystals have obvious phase jump at the pyramid–prism (PY-PR) interfaces, which will give rise to intensity modulation propagation beam. In this paper, basic properties of PY-PR interfaces in rapid are firsly characterized compared. Then, influence interface’s on third harmonic beam is researched by third-harmonic-generation (THG) experiment. It found that there exist two crystal (SHG1 SHG2) shaping a “bamboo hat” three (THG1, THG2 THG3) “basin”. The phase-jump...
A compact off-axis three-mirror system, especially with a wide field of view and small f-number, continues to present challenges in the optical design field. To system based on freeform surface, an optimization method circular configuration four parameters is proposed. In proposed method, f-number angles mirrors are combined optimize achieve high-quality imaging, which means modulation transfer function close diffraction limit. evaluate performance examples different fields (4∘×4∘, 6∘×6∘)...
In this study, a model is proposed to design and manage the stray light of compact final optics assembly (FOA) for high energy laser system. Based on method we proposed, high-order can be managed optimizing position angle optical elements. A trap designed first-order with fluence. Applying method, provide an experimental demonstration designing FOA. By comparing cleaning results no management testing result, it proves that using above management, achieve great improvement cleanliness from...
Position detection of elements, especially with high-precision and high-efficiency, continue to present challenges in the off-axis three-mirror space optical system ensure imaging quality. To test position elements an system, a method based on ResNet50 Long short-term memory (LSTM) is proposed this paper. In method, point spread function (PSF) different fields view extracted as high dimensional feature vector by network achieve efficiency. The same information from image plane obtained LSTM...
A cooled infrared off-axis freeform three-mirror system, especially with a small f-number and 100% cold stop efficiency, continues to present challenges in design, testing, assembly. primary mirror tertiary integrated structural model is proposed design system that convenient test assemble. In the model, used calculate parameters of mirrors, surface adopted achieve high imaging quality, which means spot diagram radius (RMS) smaller than Airy radius. To evaluate performance method, two...
A new adsorbent has been developed by microwave-induced carbonization with persimmon tannin, and its adsorption behaviors mechanism towards Au(III) were studied in hydrochloric acid medium. The of was found to be dependent on acidity, temperature, reaction time. maximum capacity above 700 mg g-1. selective recovery adsorption-elution experiment tested effective, the loaded metals can easily desorbed acidic thiourea. Characterized FTIR SEM, mechanisms proposed redox-reduction.
We report the experimental observation of filamentation effect in gas devices designed for X-ray Free-electron Lasers. The measurements were carried out at Linac Coherent Light Source on Correlation Spectroscopy (XCS) instrument using a Two-bunch FEL beam 6.5 keV with 122.5 ns separation passing through an Argon cell. relative intensities two pulses measured, after and before cell, from scattering off thin targets by fast diodes sufficient temporal resolution. It was found that...
Based on the frequency-to-time mapping relation of linearly chirped pulse, temporal phase shift induced by a laser-excited wake in helium gas jet is measured using chirped-pulse spectral interferometry with ~ 140 fs resolution over region 1 ps single shot. In this measurement, image obtained one-dimensional spatial and limited only bandwidth chirp pulse. The 'bubbles' feature structure, along multiple wakes excited main lobe side laser focal-spot, captured simultaneously.