A5008531165- Advanced Fiber Laser Technologies
- Photonic and Optical Devices
- Mass Spectrometry Techniques and Applications
- Advanced Measurement and Metrology Techniques
- Advanced Fiber Optic Sensors
- Optical measurement and interference techniques
- Optical Coatings and Gratings
- Analytical chemistry methods development
- Spectroscopy and Laser Applications
- Analytical Chemistry and Chromatography
- Surface Roughness and Optical Measurements
- Microfluidic and Capillary Electrophoresis Applications
- Advanced Chemical Sensor Technologies
- Advanced Optical Sensing Technologies
- Photonic Crystal and Fiber Optics
- Optical Polarization and Ellipsometry
- Scientific Measurement and Uncertainty Evaluation
- Ion-surface interactions and analysis
- Optical Coherence Tomography Applications
- Optical Systems and Laser Technology
- Sensor Technology and Measurement Systems
- Innovative Microfluidic and Catalytic Techniques Innovation
- Advanced Sensor Technologies Research
- Photorefractive and Nonlinear Optics
- Metamaterials and Metasurfaces Applications
Tsinghua University
2016-2025
University Town of Shenzhen
2016-2025
Tsinghua–Berkeley Shenzhen Institute
2019-2024
Shanghai Jiao Tong University
2011-2024
Shanghai Sixth People's Hospital
2023
Shanghai Electric Apparatus Research Institute
2022
Zhejiang Ocean University
2008-2022
Georgia Institute of Technology
2021
University of Alabama in Huntsville
2020
East China Jiaotong University
2017
Abstract Optical frequency combs (OFCs) are a unique kind of light source, which represented as series equally spaced coherent spectral lines in the domain. OFCs can mainly be divided into mode‐locked lasers, Kerr combs, and electro‐optic (E‐O combs), have broad applications optical communications, metrology, atomic clocks, distance ranging, spectroscopy, arbitrary waveform generation. Among them, E‐O feature some advantages, such fast tunable repetition rate, high sidebands power,...
An optical fiber laser salinity sensor based on multimode interference effect is proposed and demonstrated. The head manufactured by splicing a section of no-core between two single-mode fibers possesses transmission peak at certain wavelength due to effect. Salinity the liquid it immerges can be measured from shift peak. Enhanced measurement accuracy achieved inserting into cavity an erbium-doped ring laser, because laser's linewidth much narrower than that Linear response with sensitivity...
We present an absolute distance measurement system using a phase-stable dual-comb with 56.09 MHz repetition rate and 2 kHz difference. A relative phase stability of 0.1 rad in 0.5 ms between two combs is achieved mutual locking scheme. The ranging combines the time-of-flight (TOF) method, synthetic-wavelength interferometry (SWI), carrier wave (CWI). Each method provides particular ambiguity range resolution, they can be applied simultaneously linked to enhance precision system. experimental...
Disseminated adenovirus infection with fatal hepatic necrosis has been reported in 16 patients, 15 of whom had immunocompromising conditions. Herein we report three patients AIDS and fatally disseminated necrosis. The median age these was 4.7 years, their illness characterized by fever (13 patients), coagulopathy (10 16), lower respiratory tract disease gastrointestinal hemorrhage (five 16) addition to clinical evidence hepatitis. adenoviruses isolated were the commonly found serotypes 1, 2,...
Dual-comb system parameters have significant impacts on the ranging accuracy. We present a theoretical model and numerical simulation method for parameter optimization of dual-comb system. With this we investigate repetition rate difference, rate, carrier-envelope-offset frequency Firstly, results suggest series discrete zones difference in an optimal range, which are consistent with experimental results. Secondly, indicate that higher is very favorable to improve Finally, ranges The...
In this paper, a novel optical encoder enabling the simultaneous measurement of displacement and position precision stages is presented. The composed an improved single-track scale grating compact two-probe reading head. grating, multiple reference codes are physically superimposed onto incremental grooves, in contrast to conventional designs, where additional track necessary. distribution follows specific mathematical algorithm. For head, structure designed identify discrete by means...
Chromatic confocal technology (CCT) is one of the most promising methods for contactless and accurate measurement structure profiles. Based on principles chromatic dispersion theory, a probe proposed optimized with several commercial cheap refractive index lenses. The provides 0.3× magnification range 400 μm LED source an effective bandwidth ca. 450-623 nm. Since noise fluctuation can affect extraction stability focal wavelength, modification to centroid peak algorithm in this paper, where...
Abstract Periodic microscale array structures play an important role in diverse applications involving photonic crystals and diffraction gratings. A polarized holographic lithography system is proposed for patterning high-uniformity two-dimensional crossed-grating with periodic tunability. Orthogonal two-axis Lloyd’s mirror interference polarization modulation produce three sub-beams, enabling the formation of patterns wavelength-comparable periods by a single exposure. The...
Compute-in-memory (CiM) emerges as a promising solution to solve hardware challenges in artificial intelligence (AI) and the Internet of Things (IoT), particularly addressing "memory wall" issue. By utilizing nonvolatile memory (NVM) devices crossbar structure, CiM efficiently accelerates multiply-accumulate (MAC) computations, crucial operations neural networks other AI models. Among various NVM devices, Ferroelectric FET (FeFET) is appealing for ultra-low-power arrays due its CMOS...
With the rising global incidence of cancer and limitations traditional treatment methods, integration three-dimensional (3D) printing technology with drug delivery systems offers a promising solution for precision medicine. 3D printing, its high flexibility precise production control, allows accurate modulation systems, particularly in terms targeted controlled release rates, thus significantly enhancing therapeutic efficacy reducing side effects. This review focuses on applications various...
Optical sensing technologies play a crucial role in various fields such as biology, medicine, and food safety by measuring changes material properties, the refractive index, light absorption, scattering. Dielectric metasurfaces, with their subwavelength-scale geometric features ability to achieve high-quality-factor (Q-value) resonances through specific meta-atom designs, offer new avenue for achieving faster more sensitive detection. The resonant wavelength, one of key indicators design, is...
We investigate the influence of repetition rate difference on ranging accuracy a dual-comb system and suggest two-step guideline for optimization difference. The first step is to select optimal region roughly according uncertainty Nyquist sampling limit. second specific values in range pattern spectrum cross-correlation interferogram. With aid optimization, can realize high-accuracy distance measurement.
Long-term mutual coherence is a key factor that affects the signal-to-noise ratio and resolution of dual-comb interferometer. To realize phase-stable interferometer configuration, tightly phase-locked loop systems or digital error correction methods with external optical reference are commonly used. This paper presents self-referencing method based on short-term spectral characteristics interferograms to reduce cost complexity configuration. In our experiment, fully reconstructed 1 Hz...
A phase-stable dual-comb interferometer measures materials' broadband optical response functions, including amplitude, frequency, and phase, making it a powerful tool for metrology. Normally, the is realized via tight phase-locking methods. This paper presents post-correction algorithm that can compensate carrier wave phase noise interferogram timing jitter. The compensating signal beat between two combs using free-running continuous laser as an intermediary. In our experiment, sub-hertz...
Precise and fast determination of position orientation, which is normally achieved by distance angle measurements, has broad applications in academia industry. We propose a dynamic three-degree-of-freedom measurement technique based on dual-comb interferometry self-designed grating-corner-cube (GCC) combined sensor. Benefiting from its unique combination diffraction reflection characteristics, the absolute distance, pitch, yaw GCC sensor can be determined simultaneously resolving phase...
With the development of ocean exploration technology, has become a hot research field involving use autonomous underwater vehicles (AUVs). In complex environments, fast, safe, and smooth arrival target points is key for AUVs to conduct missions. Most path-planning algorithms combine deep reinforcement learning (DRL) achieve obstacle avoidance path shortening. this paper, we propose method improve local minimum in artificial potential (APF) make out by constructing traction force. The...
Underwater acoustic technology as an important means of exploring the oceans is receiving more attention. Denoising for underwater information in complex marine environments has become a hot research topic. In order to realize hydrophone signal denoising, this paper proposes joint denoising method based on improved symplectic geometry modal decomposition (ISGMD) and wavelet threshold (WT). Firstly, energy contribution (EC) introduced into SGMD iterative termination condition, which...
We present a new design for the fabrication of concave gratings with large grating constants flat-field miniature spectrometers wide spectral band. In this design, one two optical paths holographic lithography curved structure variable line spacing is modified by adding lens in front point source. The addition allows real source, as well spatial filter generating to be moved back. manner, filters sources are separated. Avoiding physical conflict between these reduces difficulty fabricating...
Artificially structured metallic meshes have been widely used in optical transparent devices for electromagnetic interference (EMI) shielding. Traditional drawbacks such as poor imaging quality from the centralized diffraction distribution and inferior EMI shielding efficiency. Here, we propose a petal-shaped mesh with anomalistic closed-loop pattern that can effectively improve efficiency by reducing equivalent period of and, meanwhile, suppress stray light achieve uniform diffraction. By...