A novel all-fiber tunable multi-wavelength Raman fiber laser is achieved in a 50 km single-mode connected to multi-channel wavelength component (MCWTC), i.e., F–P cavity combined with long-period gratings based Mach–Zehnder interferometer, that obtained by micro-processing. amplified Rayleigh scattering feedback provides the mechanism for random lasing split equidistance wavelengths and tuned continuously from 1553.9 1565.4 nm MCWTC.

Random distributed feedback fiber laser (RDF-FL) based on combination of Er-doped (EDF) and single-mode (SMF) is proposed in this paper. Through pumping both the EDF (i.e., 1480 nm pump) SMF 1455 pump), random lasing obtained. With increase pump powers, different transitions between chaotic stable status output spectrum are observed. Especially, single-peak can be obtained under operation regime.

A method for realizing low-threshold all-optical bistable logic control is proposed based on Tamm plasmons (TPs), which are formed in an asymmetric dielectric Bragg reflector (DBR)–metal–DBR (ADMD) structure with a layer of Kerr medium embedded. The ADMD supports two TPs due to coupling trapped modes at each metal–DBR interface, generating dips the structure's reflection spectrum. Thus, (i.e., pump) and controlled probe) light wavelengths close dips, respectively, can be imported. It...

The preliminary design and expected performance for the Angle-Resolved Photoemission Spectroscopy (ARPES) branchline at Shenzhen Superconducting Soft X-ray Free Electron Laser (S3FEL) is presented. A time-delay-compensated monochromator (TDCM) in symmetric layout has been designed spectral selection pulse duration preservation. TDCM optimized using six-dimensional K-matrix method a start-to-end simulation of beamline system Fourier optics was performed. Numerical estimations indicate that...

The Hippo signaling pathway restricts organ size by inactivating the Yorkie (Yki)/Yes-associated protein (YAP) family proteins. oncogenic Yki/YAP transcriptional coactivator promotes tissue growth activating target gene transcription, but regulation of activation remains elusive. In mammalian cells, we identified Brg1, a major subunit chromatin-remodeling SWI/SNF proteins, which interacts with YAP. This finding led us to investigate in vivo functional interaction Yki and Brahma (Brm),...

Modern X-ray free-electron lasers (XFELs) can generate pulses with durations ranging from femtoseconds to attoseconds. The numerical evaluation of ultra-short XFEL through beamline systems is a critical process system design. However, the bandwidth such often non-negligible, and propagation cannot be simply approximated using central wavelength, especially in dispersive systems. We developed model which called Fourier optics based Ultrashort x-Ray pulse propagatION tool (FURION). This not...

Random lasing (RL) characteristics of second-order random fiber laser formed solo by dispersion compensated are studied. It is found that the threshold first-order RL only 0.45 W. In addition, a special route to stable revealed, i.e., arc-shape output spectrum and three chaotic regimes during evolution from first one with increased pump power.

Chirped X-ray pulse compression is a promising approach for generating ultra-short free electron laser (XFEL) pulses. The design of compressors requires the careful control group delay dispersion (GDD), which plays critical role in achieving optimal compression. However, penetration crystals and multilayers can induce an extra GDD, may result over-compression or under-compression. In this study, we investigate theoretically numerically. Our results indicate that GDD induced by effect...

Free electron laser (FEL) is capable of producing ultra-short X-ray pulses. The estimation pulse propagation the key process FEL beamline design. By using Kostenbauder matrix approach, evolution an in a system can be calculated. Therefore, it significant importance to investigate matrices different kinds optics. In this work, we derive unified 6 × optical describe various elements, including varied-line-spacing (VLS) toroidal grating, VLS spherical cylindrical plane mirror, and mirror. These...

In this paper, the X-ray diffraction experiment with multiple crystals configuration and its application in characterizing emission characteristics of double crystal monochromator (DCM) on BL09 beamline Shanghai Synchrotron Radiation Facility (SSRF) are reported. It is a non-dispersion when second DCM analyzer form (+<i>n</i>, –<i>n</i>) type experimental configuration. The rocking curve can only reflect operation DCM. dispersion configurations +<i>n</i>),...

Random lasing (RL) characteristics through different combinations of single-mode fiber (SMF) and dispersion compensated (DCF) with a Raman pump (i.e., DCF is mounted at the front or end SMF; length SMF also changeable) are studied in this paper. The results indicate that position ratio influence output random distributed feedback laser (RDF-FL) greatly (e.g., threshold, spectrum stability, shape). When located where higher power distributed, RL can be enhanced remarkably. In addition,...

This article describes a high-efficiency experimental configuration for self-referenced lattice comparator with `brush beam' of synchrotron radiation from bending magnet and two linear position-sensitive photon-counting-type X-ray detectors. The efficiency is more than ten times greater compared the `pencil-beam' pair zero-dimensional A solution correcting systematic deviation d -spacing measurements caused by horizontal non-uniformity brush beam provided. Also, use one-dimensional detectors...

Highly stable single-wavelength and broadband random fiber lasers are reported as potential light sources for use in photonic sensing, the first time, which based on hybrid pumping with mixing of Er-doped (EDF) single-mode (SMF).

Lens-coupled indirect X-ray imaging detectors have the advantage of high resolution and disadvantage low detection efficiency. Using thicker single-crystalline films (SCFs) can improve However, image quality will become worse due to degradation point spread function (PSF) modulation transfer (MTF). This be improved by deconvolution with PSF, which is unknown. In this article, a method was established acquire PSF based on simulation process for lens-coupled detector. Because structural...

With the observation data of whole year from November 2012 to October 2013 and results numerical simulation, we do some research on wind energy resources Henan Province. Variation is generally better in winter spring, poor summer autumn. Diurnal variation across different, but most good resource areas are located at higher elevations, daytime than night. Wind province relatively limited, which can be technology developed hills area mountain highlands northern, central, western southern part....

Taking factors such as astronomy, atmosphere, microgeography and local landscape that comprehensively affect solar radiation into account, we established a direct (DSR) model on the accidented topography. Dynamics of DSR topography in Henan province were also statistically analyzed. Modeling results showed highest occurred between May July, while lowest December February next year, multi-annual mean was 2127.7MJ/ m 2 . Impacts differs different seasons. In winter half during which altitude...

We report improvement of the Self-referenced lattice comparator using a wide brush beam with size 16 mm × 0.3 and pair one-dimensional position sensitive X-ray counters instead pencil 1 PIN photodiode detector in former system. The experimental time is accelerated by factor more than ten times. Since we use for measurement, wavelength alone horizontal width positions are different, it necessary to establish data correction procedure comparator. reported our first after system improved,...

The advanced light source including Free Electron Laser (FEL) and Synchrotron Radiation Facility, active X-ray optics is very important for transport with high efficiency in beamlines, which has been proved by the decade's development application of bimorph mirrors. In this report, we report a new type - deformable mirror based on thermal-heat effect. Simulation results shows that provides spatial resolution over traditional mirror. addition, features simple process low cost make it possible...