Results 141 to 150 of about 348,356 (178)

Overmassive black holes and little red dots naturally form in simulations. [PDF]

Nature
Chon S, Hirano S, Ishiyama T, Chang SJ, Springel V.   +4 more
europepmc   +1 more source

Compact and high-resolution spectrometer via Brillouin integrated circuits. [PDF]

Nat Commun
Wang JQ, Yang YH, Zhu ZX, Lu JJ, Li M, Pan X, Ma C, Xiao L, Zhang B, Wang W, Dong CH, Xu XB, Guo GC, Sun L, Zou CL.   +14 more
europepmc   +1 more source

Method for Extracting Optical Element Information Using Optical Coherence Tomography. [PDF]

Sensors (Basel)
Nie J, Wang Y, Wang D, Ding Y, Zhou C, Wang J, Zhang S, Song J, Cai M, Wang J, Cui Z, Hou Y, Chen S, Liu L, Wang X.   +14 more
europepmc   +1 more source

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Compact Rotational Shearing Interferometer For Astronomical Applications

Optical Engineering, 1989
The fabrication and assembly of a compact rotational shearing interferometer with variable shear and phase compensation is described. The interferometer has been used for seeing measurements and interferometric imaging in optical astronomy.
François Roddier, Claude Roddier
exaly   +2 more sources

Astronomical spectroscopy with an echelle-interferometer Cassegrain spectrograph

Applied Optics, 1982
A novel Cassegrain spectrograph has been constructed which may be used to produce either echelle spectra or high-spectral resolution Fabry-Perot interferograms. A description of the spectrograph design is given, and results from first observational tests are used to discuss the merits and limitations of the technique for studies in high-resolution ...
B Bates
exaly   +3 more sources

Monochromator–interferometer combination for submillimeter astronomical spectrometry from aircraft

Applied Optics, 1981
A simple interferometer placed in front of a liquid helium cooled grating instrument was constructed; we have attained a spectral resolution of ?0.1 cm(-1) in the wavelength range of ~64 cm(-1) (157 microm) during observations from the NASA Kuiper Airborne Observatory. Spectra obtained on the planetary nebula NGC 7027 are shown.
R W Russell, M Harwit, Martin Harwit
exaly   +3 more sources

Interferometer-grating spectrograph for high resolution astronomical spectroscopy in the middle uv

Applied Optics, 1978
A high resolution spectrograph is described, which is to be used for a program of uv astronomical spectroscopy from a moderately stabilized, star pointing balloon-borne platform. A spectral resolving power >10(5) is achieved using an optically contacted Fabry-Perot interferometer in crossed dispersion with a grating order sorter.
C D McKeith, B Bates
exaly   +3 more sources

On Long-baseline Amplitude Interferometers in Astronomical Applications

Optica Acta, 1978
A generalized long-baseline amplitude interferometer which operates in pupil space is examined. The advantages of working in pupil space are considered by comparison with image space methods. In the absence of chromatic incoherence the pupil space interferometer gives immunity against guiding errors and arbitrarily good signal to noise ratios with ...
J C Dainty
exaly   +2 more sources

A numerical procedure for simulating the behavior of multimode, bolometric, astronomical interferometers

Journal of Applied Physics, 2005
A procedure is described for simulating the behavior of multimode, bolometric, astronomical interferometers. The procedure relies on the use of singular value decomposition to determine the fields on the sky and the fields at the detectors to which the individual elements of an interferometer can couple. The scheme can be used with any configuration of
Michael Paul Hobson, Edward S Campbell
exaly   +2 more sources

Integrated optics beam combiner at 2.2µm for astronomical interferometers

2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference (CLEO EUROPE/EQEC), 2011
Integrated optics (IO) is a powerful alternative to classical bulk optics solutions in the context of interferometric combination for astronomy. Very recent results in the near infrared (1.5 to 1.8µm) [1] confirm that integrating a complex single-mode circuit on a small chip presents numerous advantages such as: compact size, stability and self ...
Jean-Philippe Berger, Karine PERRAUT, Pierre Labeye   +2 more
exaly   +2 more sources