نتایج جستجو برای: wavefront

تعداد نتایج: 4736  

2004
Julie A. Perreault Thomas G. Bifano

Silicon deformable mirrors have the potential to modulate spatial and temporal features of an optical wavefront. This capability is critical for systems in which aberrations affect optical beam quality, including many applications in laser communication, medical imaging, astronomy, and target tracking. The main goal of the work presented here was to design, build, and test a 1024 actuator wavef...

Journal: :Journal of refractive surgery 2009
Maria Clara Arbelaez Camila Vidal Samuel Arba Mosquera

PURPOSE To evaluate the clinical outcomes of aspheric ocular wavefront ablation profiles in LASIK treatments. METHODS Thirty eyes treated by ocular wavefront were retrospectively analyzed at 6-month follow-up. Custom Ablation Manager (CAM) software was used to plan wavefront-customized aspheric treatments, and the ESIRIS system was used to perform ablations (SCHWIND eye-tech-solutions). Outco...

Journal: :Journal of synchrotron radiation 2017
Yves Kayser Christian David Uwe Flechsig Juraj Krempasky Volker Schlott Rafael Abela

A wavefront metrology setup based on the X-ray grating interferometry technique for spatially resolved, quantitative, in situ and at-wavelength measurements of the wavefront at synchrotron radiation and hard X-ray free-electron laser beamlines is reported. Indeed, the ever-increasing demands on the optical components to preserve the wavefront shape and the coherence of the delivered X-ray beam ...

2014
Suguru Miyagawa Toshifumi Mihashi Hiroyuki Kanda Yoko Hirohara Takao Endo Takeshi Morimoto Tomomitsu Miyoshi Takashi Fujikado

To investigate the changes in the wavefront aberrations and pupillary shape in response to electrical stimulation of the branches of the ciliary nerves in cats. Seven eyes of seven cats were studied under general anesthesia. Trains of monophasic pulses (current, 0.1 to 1.0 mA; duration, 0.5 ms/phase; frequency, 5 to 40 Hz) were applied to the lateral or medial branch of the short ciliary nerve ...

Journal: :Optics letters 2011
Oscar Azucena Justin Crest Shaila Kotadia William Sullivan Xiaodong Tao Marc Reinig Donald Gavel Scot Olivier Joel Kubby

We report a technique for measuring and correcting the wavefront aberrations introduced by a biological sample using a Shack-Hartmann wavefront sensor, a fluorescent reference source, and a deformable mirror. The reference source and sample fluorescence are at different wavelengths to separate wavefront measurement and sample imaging. The measurement and correction at one wavelength improves th...

Journal: :Publications of the Astronomical Society of the Pacific 2010

2015
Filip Biljecki Ken Arroyo Ohori

We investigate the automatic conversion between two substantially different formats used in 3D city models: the ubiquitous but semantically poor Wavefront OBJ and the semantically rich but less used OGC standard CityGML. We elaborate on their differences and on the challenges involved in their conversion, such as the inference of semantics in an OBJ file for their use in CityGML, and the storag...

2005
Olivier Guyon

The effects of photon noise, aliasing, wavefront chromaticity and scintillation on the point spread function (PSF) contrast achievable with ground based adaptive optics (AO) are evaluated for different wavefront sensing schemes. I show that a wavefront sensor (WFS) based upon the Zernike phase contrast technique offers the best sensitivity to photon noise at all spatial frequencies, while the S...

2014
XIAOLONG ZHANG Peter Kner Xiaolong Zhang Peter A. Kner Mark A. Haidekker William S. Kisaalita Julie Coffield

SCATTERING MEDIA by XIAOLONG ZHANG (Under the Direction of Peter Kner) ABSTRACT Random light scattering in inhomogeneous media causes strong wavefront aberrations and makes it impossible to focus light. Many wavefront correction techniques have been recently demonstrated to control light propagation in these media. Phase modulation with a spatial light modulator (SLM) and digital light modulato...

Journal: :Applied optics 2014
Likai Li Thomas W Raasch Ingo Sieber Erik Beckert Ralf Steinkopf Ulrich Gengenbach Allen Y Yi

Microinjection molding is a mass production method to fabricate affordable optical components. However, the intense nature of this process often results in part deformation and uneven refractive index distribution. These two factors limit the precision of replicated optics. In order to understand the influences of injection molding on freeform optical devices, in this study, finite element meth...

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