A5023850637- Photorefractive and Nonlinear Optics
- Advanced Fiber Laser Technologies
- Laser-Matter Interactions and Applications
- Solid State Laser Technologies
- Photonic and Optical Devices
- Photonic Crystal and Fiber Optics
- Gold and Silver Nanoparticles Synthesis and Applications
- Photonic Crystals and Applications
- Capital Investment and Risk Analysis
- Quantum Dots Synthesis And Properties
- Optical and Acousto-Optic Technologies
- Animal Behavior and Reproduction
- Semiconductor Lasers and Optical Devices
- Advanced Fluorescence Microscopy Techniques
- Optical Coatings and Gratings
- Nanocluster Synthesis and Applications
- Plasmonic and Surface Plasmon Research
- Spectroscopy and Laser Applications
- Orbital Angular Momentum in Optics
- Silk-based biomaterials and applications
- Osteoarthritis Treatment and Mechanisms
- Physiological and biochemical adaptations
- Advanced Nanomaterials in Catalysis
- Laser Design and Applications
- Lichen and fungal ecology
State Key Laboratory of High Field Laser Physics
2024-2025
South China University of Technology
2018-2025
Shanghai Institute of Optics and Fine Mechanics
2024-2025
Chinese Academy of Sciences
2024
Wenzhou University
2020
Fujian Normal University
2016
Yuan Ze University
2014
Abstract There has been a long fundamental pursuit to enhance and levitate the Raman scattering signal intensity of molecule by huge number ~ 14–15 orders magnitude, level comparable with fluorescence truly entering regime single-molecule spectroscopy. In this work we report unambiguous observation spectroscopy via synergic action electromagnetic chemical enhancement for rhodamine B (RhB) absorbed within plasmonic nanogap formed gold nanoparticle sitting on two-dimensional (2D) monolayer WS...
A high-brightness ultrabroadband supercontinuum white laser is desirable for various fields of modern science. Here, we present an intense ultraviolet-visible-infrared full-spectrum femtosecond source (with 300-5000 nm 25 dB bandwidth) with 0.54 mJ per pulse. The obtained by sending a 3.9 μm, 3.3 mid-infrared pump pulse into cascaded architecture gas-filled hollow-core fiber, bare lithium niobate crystal plate, and specially designed chirped periodically poled crystal, under the synergic...
Abstract When a pump laser beam strikes the surface of nonlinear crystal with modulated second-order nonlinearity, various diffraction phenomena occur, Raman-Nath (NRND) being prominent example. In this study, we use an 800 nm Ti:Sapphire femtosecond to periodically poled lithium niobate (PPLN) thin-plate grating. By rotating crystal, change incidence angle and observe measure exit angle, polarization, power NRND spots on other side crystal. The experiment shows that characteristics are...
The integration of a 2D WS 2 monolayer into plasmonic nanogap leads to synergistic enhancement, achieving an unprecedented Raman enhancement factor 10 14 –10 15 and ultrasensitive single-molecule SERS detection (10 −16 M).
Abstract When a laser beam is incident on nonlinear grating with laterally modulated second-order coefficient, diffraction of non-collinear second-harmonic generation (SHG) signal occurs, the Raman-Nath (NRND) being prominent example. As these SHG NRND processes involve coupling between fundamental-wave pump vectorial field and through nonlinearity second-rank tensor crystal, interaction light can be manipulated by adjusting polarization state laser. In this paper, we derive relationship...
Abstract Supercontinuum white laser with large bandwidth and high pulse energy would offer incredible versatility opportunities for basic science technology applications. Here, we report the generation of high-efficiency 2.8-octave-spanning ultraviolet-visible-infrared (UV-Vis-IR) (with 350-2500 nm 25 dB bandwidth) supercontinuum from a single chirped periodically poled lithium niobate (CPPLN) nonlinear crystal via synergic high-harmonic (HHG) self-phase modulation (SPM). The CPPLN exhibits...
Abstract In nonlinear optical systems, the superposition principle breaks down. The system’s response (including electric polarization, current density, etc) is not proportional to stimulus it receives. Over past half century, optics has grown from an individual frequency doubling experiment into a broad academic field. only brought new physics and phenomena, but also become enabling technology for numerous areas that are vital our lives, such as communications, health, advanced...
We present a detailed theoretical and numerical analysis on the temporal-spectral-spatial evolution of high-peak-power femtosecond laser pulse in two sets systems: pure lithium niobate (LN) plate periodically poled (PPLN) plate. develop modified unidimensional propagation model that considers all prominent linear nonlinear processes carried out simulation process based an improved split-step Fourier transformation method. theoretically analyze synergic action dispersion effect, second-order...
Nonlinear Raman–Nath diffraction (NRND) offers an effective way to realize multiple noncollinear parametric processes based on the partially satisfied transverse phase-matching conditions in quadratic nonlinear media. Here, realization of ultrabroadband NRND (UB-NRND) driven by a high-peak-power ultrashort femtosecond pump laser two types crystals is reported: periodically poled lithium niobate (PPLN) and chirped PPLN (CPPLN). Multi-order second-harmonic (SH) signal outputs along fixed...
Intense ultrabroadband laser source of high pulse energy has attracted more and attention in physics, chemistry, biology, material science, other disciplines. We report design realization a chirped periodically poled lithium niobate nonlinear crystal that supports second-harmonic generation covering 350-850 nm by implementing simultaneously up to 12 orders quasiphase matching against pump 700-1700 with an average conversion efficiency about 25.8%. obtain flat supercontinuum spectrum 10 dB...
White laser with balanced performance of broad bandwidth, high average and peak power, large pulse energy, spatial temporal coherence, controllable spectrum profile, overall chroma are highly desirable in various fields modern science. Here, for the first time, we report an innovative scheme harnessing synergic action both second-order nonlinearity (2 nd -NL) third-order (3 rd a single chirped periodically poled lithium niobate (CPPLN) nonlinear photonic crystal driven by high-peak-power...
Nonlinear frequency conversion offers an effective way to extend the laser wavelength range. Quadratic nonlinear photonic crystals (NPCs) are artificial materials composed of domain-inversion structures whose sign coefficients modulated with desire implement quasi-phase matching (QPM) required for conversion. These can offer various reciprocal lattice vectors (RLVs) compensate phase-mismatching during quadratic optical processes, including second-harmonic generation (SHG), sum-frequency and...
We present a systematic theoretical investigation of second-harmonic generation (SHG) in subwavelength lithium niobate (LN) single-crystal thin-film waveguide with birefringence permittivity and refractive index strong anisotropy the nonlinear susceptibility ${\ensuremath{\chi}}^{(2)}$. In macroscopic LN crystal, phase matching scheme that makes use management between extraordinary light (EL) ordinary (OL) is dominantly used to ensure high-efficiency SHG. Yet, this scenario needs significant...
Abstract Background Small birds in temperate habitats must either migrate, or adjust aspects of their morphology, physiology and behavior to cope with seasonal change temperature photoperiod. It is, however, difficult accurately measure how changes photoperiod affect physiological processes such as basal metabolic rate (BMR) activity. To address this problem, we collected data each month the year on body mass ( M b ) BMR, conducted a series experiments determine effect , BMR markers...
Nonlinear Cherenkov radiation, an intriguing noncollinear optical parametric process with versatile longitudinal phase matching, is commonly realized in engineered nonlinear photonic structures. Here, we report on the observation of ultrabroadband rainbow second-harmonic generation (UBR CSHG) a single periodically poled lithium niobate (PPLN) crystal driven by near-infrared high-peak-power ultrashort femtosecond pump laser. Multiple colored radiation bands along direction conical angles are...
An optical spectrometer is a basic spectral instrument that probes microscopic physical and chemical properties of macroscopic objects but generally suffers from difficulty in broadband time-resolved measurement. In this work, we report the creation ultrabroadband white-light laser with 3-dB bandwidth covering 385 to 1,080 nm, pulse energy 1.07 mJ, duration several hundred femtoseconds by passing 3-mJ energy, 50-fs Ti:Sapphire through cascaded fused silica plate chirped periodically poled...
We propose an improved model for the electro-optic (EO) properties of a thin film lithium niobate (TFLN) Mach-Zehnder (MZ) modulator (EOM) with arbitrary crystal axis orientation. develop analytical theory based on second-order nonlinear optics to describe linear EO effect and establish approximate calculation method aid coupling perturbation theory. By focusing optical microwave electric fields’ dominant components disregarding minor ones, we simplify process coefficient half-wave voltage...
A supercontinuum white laser with ultrabroad bandwidth, intense pulse energy, and high spectral flatness can be accomplished via synergic action of third-order nonlinearity (3rd-NL) second-order nonlinearity. In this work, we employ an Ti:sapphire femtosecond a duration 50 fs energy up to 4 mJ ignite the laser. Remarkably, use water instead usual solid materials as 3rd-NL medium exhibiting both strong self-phase modulation stimulated Raman scattering effect create significantly broadened...
Abstract Lithium niobate thin film (LNTF) is a promising platform for ultra‐low loss nonlinear integrated photonics. Here, the simultaneous generation of second harmonic wave (SHW) and dispersive (DW) are demonstrated in single LNTF under pump femtosecond pulse laser, with conversion efficiency exceeding 25%. The (SHG) uses modal phase matching mechanism based on second‐order effect, while DW perturbations soliton dynamics caused by self‐phase modulation higher‐order dispersion. Notably,...