Results 71 to 80 of about 1,567 (171)

Theoretical modelling of a planar piston field focussed by reflection

open access: yes
This work describes a full rigorous theoretical prediction of the field from a planar piston ultrasonic transducer that is focussed by reflection from an off-axis parabolic mirror.

core  

Renewable Liquid Optics with Magneto-electrostatic Control

open access: yes, 2001
We suggest a new class of high-flux renewable optics, in particular, for the use at the X-ray free electron laser, LCLS, which is under discussion now. The size of optical elements we have in mind is from a fraction of a square centimeter to a few square
Ryutov, D, Toor, A
core  

Speckle-based curvature optical metrology. [PDF]

open access: yesLight Sci Appl
Wang H   +3 more
europepmc   +1 more source

Adaptive Optics Pathfinders & Phasing Testbeds for a New Era of Extremely Large Telescopes

open access: yes
The large apertures of the upcoming generation of Extremely Large Telescopes (ELTs) will enable unprecedented angular resolutions that scale as ∝ λ/D and higher sensitivities that scale as D^4 for point sources.
Kautz, Maggie
core  

A 25 m Live Optics Telescope

open access: yes, 1996
A 25 m four mirror live optics telescope is studied. M1 is spherical with 141 segments and f/0.96. M1 is reimaged onto M4 also with 141 segments. Image FWHM is <0.1 arc sec over > 20 arc min.
Jessen, Niels-Christian   +3 more
core  

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