نتایج جستجو برای: infrared source
تعداد نتایج: 517719 فیلتر نتایج به سال:
For the first time, we demonstrated that a hyper-broadband from 2μm to 10μm can be generated with a high spectral flatness by using a ~4 um pump and an As2Se3 photonic crystal fiber. The broad and flat dispersion profile and the low guiding loss of the endlessly single-mode As2Se3 photonic crystal fibers combining with the high nonlinearity and wide mid-infrared transparent window of As2Se3 cha...
We study the sensitivities of space infrared interferometers. We formulate the signal-to-noise ratios of infrared images obtained by aperture synthesis in the presence of source shot noise, background shot noise, and detector read noise. We consider the case in which n beams are combined pairwise at n(n-1)/2 detectors and the case in which all the n beams are combined at a single detector. We a...
We present JK ′ infrared images of the X-ray transient KS 1731–260, obtained in 1997 and in 1998 with IRAC2b at the ESO/MPI 2.2-m telescope at La Silla. Using as a reference the recent Chandra position, we confirm the identification of the X-ray source with the previously proposed counterpart (Wijnands et al. 2001b), for which we measure J = 17.32 ± 0.2 and K ′ = 16.36 ± 0.18. The source was en...
The bright star θ1 Orionis A, the third most luminous OB star in the Orion Trapezium Cluster, is known as a strongly variable non-thermal radio source. The physical nature of the emission mechanism has been a matter of debate since almost two decades. In this contribution we re-analyse available radio data in combination with near-infrared observations to investigate the radio-emission mechanis...
Pseudomorphic Si12yCy alloys on silicon ~100! were grown by molecular beam epitaxy using a single effusion source of silicon contained in a graphite crucible, producing carbon concentrations of y50.008. The behavior of carbon incorporation using this source was studied as a function of growth temperature using x-ray diffraction and infrared spectroscopy, and was compared to previous studies, wh...
Far-infrared-absorption spectroscopy is used to investigate the low-frequency (<or=100 cm-1) intermolecular interactions in liquid methanol. Using an intense source of far-infrared radiation, modes are elucidated at approximately 30 and 70 cm-1 in the absorption spectrum. These modes are believed to arise from intermolecular bending and librational motions, respectively, and are successfully re...
We demonstrate a two-stage wavelength converter that uses compact near-infrared sources to amplify and convert short-wave infrared signals. The first stage consists of a photonic crystal fiber wavelength converter pumped by a Q-switched 1064 nm pump source, while the second stage consists of a silicon photonic wire waveguide wavelength converter. The system enables on-chip amplification and con...
We use the source counts measured with the Multiband Imaging Photometer for Spitzer at 24, 70, and 160 m to determine the 5 confusion limits due to extragalactic sources: 56 Jy, 3.2 mJy, and 40 mJy at 24, 70, and 160 m, respectively. We also make predictions for confusion limits for a number of proposed far-infrared missions of larger aperture (3.5–10 m diameter). Subject headinggs: galaxies: e...
The European Large Area ISO Survey (ELAIS) will provide Infrared observations of 4 regions in the sky with ISO. Around 2000 Infrared sources have been detected at 7 and 15 m (with ISOCAM), 90 and 175 m(with ISOPHOT)) over 13 square degrees of the sky. We present the source extraction pipeline of the 90 m ISOPHOT observations, describe and discuss the results obtained and derive the limits of th...
We have observed very strong magnetization-induced changes of the infrared-visible sum-frequency generation ~SFG! intensity from thin magnetic films using a free electron laser as a tunable infrared source. With the help of a magnetic grating a clear resonance is observed due to the excitation of surface plasmonpolaritons. The magnetization dependence of this resonance opens the way for nonline...
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