Results 101 to 110 of about 5,505 (209)
Thermal analysis and experimental study of end-pumped Nd: YLF laser at 1053 nm
Photonic Sensors, 2017 We have numerically analyzed the thermal effects in Nd: YLF laser rod. The calculations of temperature and stress distributions in the Nd: YLF laser rod was performed with finite element (FE) simulations.
R. M. El-Agmy, N. Al-Hosiny
doaj +1 more source
Miniaturized Shack-Hartmann Wavefront-Sensors for ELTs
, 2015 The miniaturization of wavefront sensors overcomes some of the potential barriers faced by ELTs in implementing large- scale multi-object adaptive optics over large focal surfaces. The Australian Astronomical Observatory is prototyping a compact and lightweight Shack-Hartmann wavefront-sensor designed to be positioned by their Starbug parallel fibre ...
Goodwin, Michael +4 more
openaire +3 more sources
, 2018 Coronagraphs on future space telescopes will require precise wavefront correction to detect Earth-like exoplanets near their host stars. High-actuator count microelectromechanical system (MEMS) deformable mirrors provide wavefront control with low size ...
Allan, Gregory +11 more
core +1 more source
High Power Laser Science and EngineeringIn laser systems requiring a flat-top distribution of beam intensity, beam smoothing is a critical technology for enhancing laser energy deposition onto the focal spot.
Yamin Zheng +9 more
doaj +1 more source
Measurement Error of Shack-Hartmann Wavefront Sensor
, 2012 A Shack-Hartmann sensor is one of the most important and popular wavefront sensors used in an adaptive optics system to measure the aberrations caused by either atmospheric turbulence, laser transmission, or the living eye [1-7]. Its design was based on an aperture array that was developed in 1900 by Johannes Franz Hartmann as a means to trace ...
Li, Chaohong +3 more
openaire +3 more sources
Active Control of Laser Wavefronts in Atom Interferometers
, 2017 Wavefront aberrations are identified as a major limitation in quantum sensors. They are today the main contribution in the uncertainty budget of best cold atom interferometers based on two-photon laser beam splitters, and constitute an important limit ...
Langlois, Mehdi +3 more
core +2 more sources
Lorentz Force Actuated Tunable-Focus Liquid Lens
Micromachines, 2019 Tunable-focus liquid lenses provide focal length tuning for optical systems, e.g., cameras, where physical movement of rigid lenses are not an option or not preferable.
Kari L. Van Grinsven +2 more
doaj +1 more source
Flexible Electrowetting-on-Dielectric Microlens Array Sheet
Micromachines, 2019 We have fabricated a fully-flexible, focus-tunable microlens array on a sheet and demonstrated its imaging capabilities. Each liquid lens of the array is individually tunable via electrowetting on dielectric (EWOD) actuation and is situated on a ...
Kari L. Van Grinsven +2 more
doaj +1 more source
PhotonicsAtmospheric turbulence introduces distortions to the wavefront of propagating optical radiation. It causes image resolution degradation in astronomical telescopes and significantly reduces the power density of radiation on the target in focusing ...
Ilya Galaktionov, Vladimir Toporovsky
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Large dynamic range Shack-Hartmann wavefront sensor based on adaptive spot matching
Light: Advanced ManufacturingThe Shack-Hartmann wavefront sensor (SHWS) is widely used for high-speed, precise, and stable wavefront measurements. However, conventional SHWSs encounter a limitation in that the focused spot from each microlens is restricted to a single microlens ...
Jiamiao Yang +5 more
doaj +1 more source