نتایج جستجو برای: brightness mode
تعداد نتایج: 239306 فیلتر نتایج به سال:
We present a method to reduce the impact of source brightness fluctuations (SBFs) on spectra recorded by Fourier-transform spectrometry (FTS). Interferograms are recorded without AC coupling of the detector signal (DC mode). The SBF are determined by low-pass filtering of the DC interferograms, which are then reweighted by the low-pass, smoothed signal. Atmospheric solar absorption interferogra...
A high brightness, low emittance photocathode rf gun is starting operation at UCLA as an injector to a 20 MeV linac. This linac will initially be used to drive FELs, plasma wakefield accelerators, and to test plasma lenses. The gun is a 1 89 cell ~r-mode standing wave structure running at 2.856 GHz, and has a copper photocathode. In the initial commissioning of the gun, photoelectron beams of u...
A novel fluorescence detector based on collinear scheme using a brightness light-emitting diode emitting at 470nm as excitation source is described. The detector is assembled by all-solid-state optical-electronic components and coupled with capillary electrophoresis using on-column detection mode. Fluorescein isothiocyanate (FITC) and FITC-labeled amino acids and small molecule peptide as test ...
Quantum dots (QDs) embedded in photonic nanowires have proved promising as sources of single photons [1–3] for applications in quantum information protocols. Investigations have shown that the brightness of these light sources depend on the diameter and taper of the nanowire as well as the axial and lateral position of the quantum dot dipole within it. In addition to efficient collection of the...
After cosmological recombination, the primordial hydrogen gas decoupled from the cosmic microwave background (CMB) and fell into the gravitational potential wells of the dark matter. The neutral hydrogen imprinted acoustic oscillations on the pattern of brightness fluctuations due to its redshifted 21cm absorption of the CMB. Unlike CMB temperature fluctuations which probe the power spectrum at...
The generation of photon pairs is useful for a broad range of applications, from the fundamental (exclusion of hidden-variable formulations of quantum mechanics) to the more practical (quantum cryptography and quantum computation). A key parameter determining the usefulness of a particular source is its brightness, i.e., how many photon pairs per second are generated into a particular electroma...
We demonstrate a compact photon pair source based on a periodically poled lithium niobate nonlinear crystal in a short cavity. This approach provides efficient, low-loss, mode selection that is compatible with standard telecommunication networks. Photons with a coherence time of 8.6 ns (116 MHz) are produced and their purity is demonstrated. A source brightness of 134 pairs (s. mW. MHz)(-1) is ...
The experimental demonstration of a diode-pumped passively mode-locked femtosecond laser based on an Yb3+:CaGdAlO4 single crystal is reported. The oscillator is directly diode pumped by a high-brightness 5 W fiber coupled laser diode, and pulses are produced by use of a semiconductor saturable-absorber mirror. It permits the production of pulses as short as 47 fs at 1050 nm, which are to our kn...
High-power Free-Electron Lasers were made possible by advances in superconducting linacs operated in energy-recovery mode. In order to get to very high power levels, say a fraction of a megawatt average power, many technological barriers are yet to be broken. We describe work on CW, high-current and high-brightness electron beams. This will include descriptions of a superconductinglaser-photoca...
We demonstrate a compact and stable source of polarization-entangled pairs of photons, one at 810 nm wavelength for high detection efficiency and the other at 1550 nm for long-distance fiber communication networks. Due to a novel Sagnac-based design of the interferometer no active stabilization is needed. Using only one 30 mm ppKTP bulk crystal the source produces photons with a spectral bright...
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