Publications related to Focus (optics)

Assessing microlens quality based on 3D irradiance measurement at the focal spot area

Toralf Scharf, Wilfried Noell, Jeremy Béguelin, Michail Symeonidis

During the fabrication process of microlenses, characterization is essential for two purposes: evaluate the optical quality of the element and provide surface information feedback for process optimization. However, no technique can fulfill these two object ...

2018

Light refocusing with up-scalable resonant waveguide gratings in confocal prolate spheroid arrangements

Olivier Martin, Zdenek Benes, Benjamin Gallinet, Giorgio Quaranta, Guillaume Basset

Resonant waveguide gratings (RWGs) are thin-film structures, where coupled modesinterfere with the diffracted incoming wave and produce strong angular and spectral filtering. The combination of two finite-length and impedance matched RWGs allows the creati ...

2018

The multi-spectral imaging diagnostic

Basil Duval, Christian Gabriel Theiler, Yanis Andrebe, Kevin Henricus Annemarie Verhaegh, Mirko Wensing

The Multi-Spectral Imaging system is a new diagnostic that captures simultaneous spectrally filtered images from a common line of sight while maintaining a large etendue and high throughput. Imaging several atomic line intensities simultaneously may enable ...

2018

Field and frequency modulated sub-THz electron spin resonance spectrometer

Jean-Philippe Ansermet, Murari Soundararajan, Christian Caspers

260-GHz radiation is used for a quasi-optical electron spin resonance (ESR) spectrometer which features both field and frequency modulation. Free space propagation is used to implement Martin-Puplett interferometry with quasi-optical isolation, mirror beam ...

Amer Inst Physics2016

Beam propagation and stray radiation in the ITER EC H&CD Upper Launcher

Timothy Goodman, Matthieu Toussaint

The four ITER Electron Cyclotron Upper Launchers (UL) are designed to control Magneto-Hydrodynamic instabilities with the deposition of Electron Cyclotron power. According to the present design, each launcher comprises two rows of four input waveguides, wh ...

EDP Sciences2015

Interferometric study on Gouy phase anomaly of microlens array

Hans Peter Herzig, Toralf Scharf, Wilfried Noell, Myun Sik Kim

We investigate the Gouy phase anomaly of light in the focus of refractive plano-convex microlens arrays by using longitudinal-differential (LD) interferometry and a finite-difference time-domain (FDTD) simulation. We put emphasis on determining the amount ...

Spie-Int Soc Optical Engineering2015

MULTISCALE GUIDED DEBLURRING: CHROMATIC ABERRATION CORRECTION IN COLOR AND NEAR-INFRARED IMAGING

Sabine Süsstrunk, Yue Lu, Zahra Sadeghipoor Kermani

Chromatic aberration, caused by photographic lens imperfections, results in the image of only one spectral channel being sharp, while the other channels are blurred depending on their wavelengths difference with the sharp channel. We study chromatic aberra ...

2015

Organic-inorganic-hybrid-polymer microlens arrays with tailored optical characteristics and multi-focal properties

Jürgen Brugger, Victor Javier Cadarso Busto, Loïc Jacot-Descombes

Plano-convex microlens arrays of organic-inorganic polymers with tailored optical properties are presented. The fine-tuning of each microlens within an array is achieved by confining inkjet printed drops of the polymeric ink onto pre-patterned substrates. ...

Optical Society of America2015

Enhanced resolution in a multimode fiber imaging system

Demetri Psaltis, Christophe Moser, Nicolino Stasio, Grégoire Pierre Jean Laporte

Multimode fibers have recently been demonstrated to be a promising candidate for ultrathin and high resolution endoscopy. However, this method does not offer depth discrimination for fluorescence imaging and the numerical aperture of the fiber limits its r ...

Optical Soc Amer2015

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Focus (optics)

Assessing microlens quality based on 3D irradiance measurement at the focal spot area

Light refocusing with up-scalable resonant waveguide gratings in confocal prolate spheroid arrangements

The multi-spectral imaging diagnostic

Field and frequency modulated sub-THz electron spin resonance spectrometer

Beam propagation and stray radiation in the ITER EC H&CD Upper Launcher

Interferometric study on Gouy phase anomaly of microlens array

MULTISCALE GUIDED DEBLURRING: CHROMATIC ABERRATION CORRECTION IN COLOR AND NEAR-INFRARED IMAGING

Organic-inorganic-hybrid-polymer microlens arrays with tailored optical characteristics and multi-focal properties

Synergy of hyperspectral and microwave remote sensing data to derive bio- and geo-physical parameters for land applications

Enhanced resolution in a multimode fiber imaging system

Graph Chatbot

Chat with Graph Search

Interferometric study on Gouy phase anomaly of microlens array

Field and frequency modulated sub-THz electron spin resonance spectrometer

Organic-inorganic-hybrid-polymer microlens arrays with tailored optical characteristics and multi-focal properties

The multi-spectral imaging diagnostic

MULTISCALE GUIDED DEBLURRING: CHROMATIC ABERRATION CORRECTION IN COLOR AND NEAR-INFRARED IMAGING

Synergy of hyperspectral and microwave remote sensing data to derive bio- and geo-physical parameters for land applications

Enhanced resolution in a multimode fiber imaging system

Light refocusing with up-scalable resonant waveguide gratings in confocal prolate spheroid arrangements

Assessing microlens quality based on 3D irradiance measurement at the focal spot area

Beam propagation and stray radiation in the ITER EC H&CD Upper Launcher