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Cascaded Optical Kerr Gate for Fluorescence Measurement With High Signal-to-Noise Ratio
Traditional optical Kerr gates (OKG) often suffer from leakage fluorescence background when sampling and measuring fluorescence spectra due to the limited extinction of the polarizers used in optical Kerr gates. In this letter, we propose a cascaded optical Kerr gate (COKG) for measuring fluorescence spectroscopy with a high signal-to-noise ratio by suppressing this leakage fluorescence background...Show More
Fabrication of Integrated Single Frequency DBR Fiber Laser Directly on YDF by Femtosecond Laser
Ruidong Lv;Tao Chen;Jin Huang;Zenghui Sun;Yuxing Hou;Jinhai Si;Yang Yu;Xun Hou
IEEE Photonics Technology Letters
Cited by: Papers (3)
A 1080 nm single-polarization single frequency distributed Bragg reflector (DBR) fiber laser is fabricated by directly inscribing fiber Bragg gratings (FBGs) in ytterbium-doped fiber using a femtosecond laser. The high reflectivity FBG with high birefringence is prepared by femtosecond laser overexposure, serving a polarizing element. The low reflectivity FBG is inscribed by scanning axially along...Show More
Femtosecond Laser Induced Supermetalphobicity for Design and Fabrication of Flexible Tactile Electronic Skin Sensor
2022 IEEE International Flexible Electronics Technology Conference (IFETC)
Year: 2022 | Conference Paper |
Pursuing flexible tactile electronic skin sensors with superior comprehensive performances is highly desired in practical applications. However, current flexible tactile electronic skin sensors suffer insufficient flexibility and sensitivity, as well as high-cost and low-efficiency in fabrication and susceptible to contaminant in sensing performances. Here, a highly sensitive all-flexible tactile ...Show More
Analysis and Experiment of Nanosecond Pulse Circuit Based on Commercial Si-p-i-n Rectifier Diode
Zhaoyang Wu;Yan Wang;Jingwen Zhang;Fanbao Meng;Hengqing Zhang;Xun Hou
In this article, a nanosecond pulse generation circuit is designed and fabricated based on a commercial Si-p-i-n rectifier diode using the DSRD principle. The circuit is composed of four parallel stacks with a 3-kV pulse output and a rise time of less than 2 ns. Each stack contains four diodes in a series. The working principle and main parameters of the circuit are analyzed by Pspice, and the sim...Show More
Whispering gallery (WG) mode resonators are experiencing a surge in the application of biosensing, attributing to high speed, flexibility, low cost, multi-analyte detection and compatibility with extra optical elements. The decoration of localized surface plasmon nanostructures to a dielectric WG mode resonator offers unprecedented sensitivity compared with a pure dielectric resonator. However, at...Show More
Fabrication of ZnSe Microlens Array for a Wide Infrared Spectral Region
Fan Zhang;Qing Yang;Hao Bian;Feng Liu;Minjing Li;Xun Hou;Feng Chen
IEEE Photonics Technology Letters
Cited by: Papers (8)
The infrared (IR) is a strategically important band for numerous applications from environment to biochemical imaging. Here a novel IR optical component integrates more than 2000 plano-concave microlenses on the zinc selenide (ZnSe) surface within a footprint of 5×5mm2 is proposed by a combined method of femtosecond laser direct irradiation and chemical wet etching. Microlenses with diameter from ...Show More
Wide-Range Wavelength-Tunable Mode-Locked Fiber Laser Based on Fiber Bragg Grating
IEEE Photonics Technology Letters
Cited by: Papers (11)
We demonstrated a wide-range wavelength-tunable passively mode-locked fiber laser based on the fiber Bragg grating (FBG) fabricated by femtosecond laser as the wavelength selection element. A ring fiber cavity with the nonlinear-optical loop mirror as its saturable absorber was employed for mode-locking operation. The peak wavelength of the fiber laser was 1547.9 nm with a spectral full-width-at-h...Show More
Wide Range Refractive Index Measurement Based on Off-Axis Tilted Fiber Bragg Gratings Fabricated Using Femtosecond Laser
Journal of Lightwave Technology
Cited by: Papers (16)
In this paper, we propose an off-axis tilted fiber Bragg grating (OTFBG) in which the grating structure is limited to one side of the fiber core cross section. The tilted grating planes are fabricated using a femtosecond laser with a phase mask. The wavelength range of the OTFBG cladding mode resonance could be twice that of a conventional tilted fiber Bragg grating with the same tilt angle. The r...Show More
Immunoassay is a biochemical test that measures the presence or concentration of biomolecule in a solution by the means of the antibody (or antigen). Most immunoassays involve chemically linking antibodies or antigens with some kind of detectable labels which produce measurable signals in response to the binding. The use of labels creates problems, including complexity in the screening process and...Show More
Generation of carrier-envelope phase stabilized laser from solid plates and application in high-harmonic generation
Yangyang Liu;Peng He;Kun Zhao;Hangdong Huang;Yujiao Jiang;Pei Huang;Hao Teng;Xinkui He;Shaobo Fang;Xun Hou;Zhiyi Wei
2017 Conference on Lasers and Electro-Optics (CLEO)
Year: 2017 | Conference Paper |
Speckle Suppression of OKG Imaging in Highly Turbid Medium Using SC-Assisted Fundamental Frequency
Yuhu Ren;Jinhai Si;Wenjiang Tan;Yipeng Zheng;Junyi Tong;Xun Hou
IEEE Photonics Technology Letters
Cited by: Papers (2)
We propose a method to suppress the speckle of optical Kerr gated (OKG) imaging in highly turbid medium using an 800-nm femtosecond laser, in which, the 800-nm fundamental frequency light and the supercontinuum (SC) containing the fundamental frequency are used as the gating beam and imaging beam, respectively. A sequence of images of a test chart hidden behind a highly turbid medium is obtained u...Show More
Microscopic Imaging Through a Turbid Medium by Use of a Differential Optical Kerr Gate
Yuhu Ren;Jinhai Si;Wenjiang Tan;Shichao Xu;Junyi Tong;Xun Hou
IEEE Photonics Technology Letters
Cited by: Papers (8)
Microscopic imaging of hidden objects in scattering media is demonstrated using a differential optical Kerr gate (DOKG). The results show that the high spatial frequency components of the imaged object filtered by the optical Kerr gate can be considerably compensated using the DOKG. Microscopic images with a maximal lateral resolution of ~2-μm can be achieved. Compared with OKG microscopic imaging...Show More
Femtosecond-Laser-Induced Formation of Visible-Light-Emitting Structures Inside Silicon
IEEE Photonics Technology Letters
Cited by: Papers (1)
We report a 680-nm photoluminescence (PL) from a femtosecond-laser-modified region inside silicon. Light-emitting structures were formed inside silicon by femtosecond laser irradiation in an air atmosphere. The formation of light-emitting structures arose from laser-induced oxygen doping, and the doping depths of a few hundred micrometers could be reached. PL intensities increased with increasing ...Show More
Fabrication of complex three-dimensional metallic microstructures based on femtosecond laser micromachining
Feng Chen;Qing Yang;Chao Shan;Keying Liu;Xiangwei Meng;Xun Hou
2015 Conference on Lasers and Electro-Optics (CLEO)
Year: 2015 | Conference Paper |
The fabrication of complex metallic microstructures based on femtosecond laser micromachining and metal microsolidify process is demonstrated. This method is beneficial for building complex embedded 3D metal microstructures, electronic components, and hybrid electronic-microfluidic devices.Show More
Direct Fabrication of Microlens Arrays on PMMA With Laser-Induced Structural Modification
Yan Ou;Qing Yang;Feng Chen;Zefang Deng;Guangqing Du;Jiuhong Wang;Hao Bian;Jiale Yong;Xun Hou
IEEE Photonics Technology Letters
Cited by: Papers (19)
Reported here is the direct fabrication of the convex microlens arrays on poymethylmethacrylate using laser-induced structural modification. Based on single femtosecond pulse in situ modification, sixty thousand convex microlenses, whose diameters was <;12 μm, could be fabricated per minute, exhibiting much higher efficiency than conventional laser direct writing technique. The formation mechanism...Show More
High-Performance Laser Beam Homogenizer Based on Double-Sided Concave Microlens
Zefang Deng;Qing Yang;Feng Chen;Hao Bian;Jiale Yong;Guangqing Du;Yang Hu;Xun Hou
IEEE Photonics Technology Letters
Cited by: Papers (21)
Microlens array (MLA) has attracted increasing interest as its application in micro-optical device and system. In this letter, we proposed a new approach that applies rotational displacement MLA to the laser homogenization system. These are nonregular arrays consisting of close-packed concave MLAs on two sides with specific rotation angle. And, the double-sided MLAs diffusers with new design param...Show More
Multi-Frame Observation of a Single Femtosecond Laser Pulse Propagation Using an Echelon and Optical Polarigraphy Technique
Lihe Yan;Xiaofang Wang;Jinhai Si;Pengchao He;Feng Chen;Jianhua Zou;Xun Hou
IEEE Photonics Technology Letters
Cited by: Papers (8)
We developed a multiframe observation method of femtosecond laser pulse propagating in transparent medium based on optical polarigraphy technique. An echelon was introduced into the probe light and divided it into multipulses both in time and space, allowing a multiframe detection of the intense laser pulse propagating in materials. Using this method, we realized a multiframe observation of a sing...Show More
A Simple Way to Fabricate Close-Packed High Numerical Aperture Microlens Arrays
Xiangwei Meng;Feng Chen;Qing Yang;Hao Bian;Hewei Liu;Pubo Qu;Yang Hu;Jinhai Si;Xun Hou
IEEE Photonics Technology Letters
Cited by: Papers (13)
We present a developed femtosecond laser enhanced wet chemical etching method to fabricate close-packed and high numerical aperture (NA) microlens arrays (MLAs). Its ability to fabricate 100% fill factor MLAs with controllable NA is demonstrated and the maximum NA value of the lenses reaches to 0.47. This letter provides a simple and efficient way to achieve controllable and low cost optical eleme...Show More
Superior Method for Measuring Chirp Structure of Femtosecond Supercontinuum Pulse
Hang Zhang;Jun Cheng;Jinhai Si;Hui Liu;Lihe Yan;Feng Chen;Xun Hou
IEEE Photonics Technology Letters
Cited by: Papers (1)
We present a straightforward method to measure the temporal chirp structure of supercontinuum (SC) pulses. Wavelength-tunable laser pulses acquired from the chirped SC are spatially separated from the incident SC region, which can be detected with zero background in the detection plane. Experimental results show that this convenient method, which is based on ultrafast transient lens effect, has ma...Show More
High Time-Resolved Three-Dimensional Imaging Using Ultrafast Optical Kerr Gate of Bismuth Glass
Wenjiang Tan;Junyi Tong;Jinhai Si;Yi Yang;Wenhui Yi;Feng Chen;Xun Hou
IEEE Photonics Technology Letters
Cited by: Papers (5)
We have demonstrated the high time-resolved three dimensional (3-D) imaging using a chirped supercontinuum (SC) and an ultrafast optical Kerr gate (OKG) generated with a femtosecond laser, in which a sapphire plate and a Bi2O3-B2O3-SiO2 oxide glass (BI glass) were used to generate the chirped SC and the optical Kerr gate, respectively. The experimental results show that the 3-D imaging using BI gl...Show More
Polarization Dependence of Femtosecond Optical Kerr Signals in Bismuth Glasses
IEEE Photonics Technology Letters
Cited by: Papers (6)
Using the optical Kerr shutter (OKS) technique with an 800-nm femtosecond laser, we demonstrated that the response time of the glass was less than 85 fs. The nonlinear refractive-index of Bi2O3-B2O3-SiO2 (BI) oxide glass was estimated to be about 2.93times10- 15cm2/W. By measuring the dependence of the OKS signals on the pump power and on the polarization angle between pump and probe beams, we fou...Show More
A Prototype X-ray Framing Camera With Variable Exposure Time Based on Double-Gated Micro-Channel Plates
Wenzheng Yang;Xun Hou;Yonglin Bai;Xiaohong Bai;Baiyu Liu;Junping Zhao;Junjun Qin
We present a novel X-ray frame camera with variable exposure time that is based on double-gated micro-channel plates (MCP). Two MCPs are connected so that their channels form a Chevron-MCP structure, and four parallel micro-strip lines (MSLs) are deposited on each surface of the Chevron-MCP. The MSLs on opposing surfaces of the Chevron-MCP are oriented normal to each other and subjected to high vo...Show More
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