Design and development of a 329-segment tip-tilt piston mirror array for space-based adaptive optics [PDF]
SPIE MOEMS-MEMS, 2006 Jason B. Stewart +5 more
openalex +2 more sources
On-sky Reconstruction of Keck Primary Mirror Piston Offsets Using a Zernike Wavefront Sensor [PDF]
Astrophysical Journal, 2022 The next generation of large ground- and space-based optical telescopes will have segmented primary mirrors. Co-phasing the segments requires a sensitive wavefront sensor capable of measuring phase discontinuities.
M. V. van Kooten +5 more
semanticscholar +1 more source
Piston-Type Optical Modulator for Dynamic Thermal Radiation Tuning Applications [PDF]
Materials, 2021 This study introduces a movable piston-like structure that provides a simple and cost-effective avenue for dynamically tuning thermal radiation. This structure leverages two materials with dissimilar optical responses—graphite and aluminum—to modulate from a state of high reflectance to a state of high absorptance.
Andrew Caratenuto, Yi Zheng
openaire +2 more sources
In-Situ Metrology of Large Segmented Detector Based on Modified Optical Truss
IEEE Photonics Journal, 2023 To precisely map cosmic structures and capture time-domain events, future large survey telescopes will be equipped with segmented detectors that greatly expand their field of view. Segment flatness and assembly accuracy will be essential for them to make
Qichang An +6 more
doaj +1 more source
Visible extreme adaptive optics for GMagAO-X with the triple-stage AO architecture (TSAO) [PDF]
Astronomical Telescopes + Instrumentation, 2022 The Extremely Large Telescopes will require hundreds of actuators across the pupil for high Strehl in the visible. We envision a triple-stage AO (TSAO) system for GMT/GMagAO-X to achieve this.
S. Haffert +5 more
semanticscholar +1 more source
Optical fiber analogous of the piston shock problem [PDF]
Advanced Photonics 2018 (BGPP, IPR, NP, NOMA, Sensors, Networks, SPPCom, SOF), 2018 We investigate the optical analogous of the piston shock problem in gas dynamics. Using fast temporal measurements, we recorded dispersive shock waves formed by the propagation of a bi-chromatic photon fluid along an optical fiber.
Bendahmane, Abdelkrim +5 more
openaire +2 more sources
Spatiotemporal statistics of the turbulent piston-removed phase and Zernike coefficients for two distinct beams. [PDF]
Journal of The Optical Society of America A-optics Image Science and Vision, 2021 In the context of adaptive optics for astronomy, one can rely on the statistics of the turbulent phase to assess a part of the system's performance. Temporal statistics with one source and spatial statistics with two sources are well known and widely ...
C. Plantet +3 more
semanticscholar +1 more source
Dynamics of photon fluid flows driven by optical pistons [PDF]
Conference on Lasers and Electro-Optics, 2019 The piston problem, i.e. the dynamics of a uniform gas at rest under the action of a moving piston, is fundamental in shock wave physics [1,2]. In conservative systems, shock waves are regularized by the formation, owing to dispersion, of rapidly oscillating non-stationary structures, called dispersive shock waves (DSWs) [3–6].
Bendahmane, Abdelkrim +5 more
openaire +6 more sources
Inducing dynamical bistability by reversible compression of an optical piston [PDF]
Physical Review E, 2015 We study the reversible crossover between stable and bistable phases of an overdamped Brownian bead inside an optical piston. The interaction potentials are solved developing a method based on Kramers's theory that exploits the statistical properties of the stochastic motion of the bead. We evaluate precisely the energy balance of the crossover.
Cyriaque Genet, Gabriel Schnoering
openaire +4 more sources
Oil Film Formation of Reciprocating Seals Observed by Interferometry
Tribology Online, 2014 Oil film thickness in rubber piston seals is measured by interferometry. Optimized optics and fluids enable clear interferograms. The oil film thickness on the contact area is measured during reciprocating motion.
Kenichi Yoshimura +2 more
doaj +1 more source