To improve the grating wavefront quality especially the grating size, which is more than 1 m, we provide a method based on conical diffraction theory and grating groove active control technology to correct the grating substrate surface error. We apply the grating groove active control technology ...
Reflected Wavefront Error (RWE) is the degree of deviation seen in the wavefront when a beam is reflected off surface of an optical component compared to a perfectly flat plano surface. Surface flatness and RWE are directly related in that flatness describes the physical deviation of the optic ...
All optical elements are fabricated from high laser-damage resistant glasses and are anti-reflection coated to reduce reflectance per surface to 0.13%. The working distance between the lens and the target is sufficiently large to allow use of a gas nozzle to enhance the cutting or welding process...
Related content from Photonics Media Products Photonics Handbook Articles Interferometry: Measuring with Light An interferometer is an instrument that compares the position or surface structure of two objects. The basic two-beam division of amplitude interferometer components consists of a light source, a...
The observed changes of spherical aberration are related to surface curvature changes of the crystalline lens and the cornea. When the pupils were dilated to a diameter of 9.5 mm, our results showed that changes to the shape of the peripheral portion of the lens also caused changes in ...
Roberts C. Characterisation of the inherent error in a spherically-biased corneal topography system in mapping a radically aspheric surface. J Refract Corneal Surg. 1994;10:103–11. ArticleCASPubMedGoogle Scholar Roberts C. The accuracy of power maps to display curvature data in corneal topography...
We show that even in the complex geometry of a whole guinea pig heart, optical upstroke morphology reveals the 3D wavefront orientation near the surface. To characterize the upstroke morphology, we use VF∗, the fractional level at which voltage-sensitive fluorescence, VF, has maximal time ...
Consequently, for highly curved wavefronts ϕ, the residual wavefront recovery error creates a caustic effect, which modulates the recovered bright field image, causing ambiguous interpretation of the recovered bright field image, as a result of a mixture of caustic effect and sample intensity. ...
At each visit, slit-lamp examination, UDVA, CDVA, residual refractive error with calculation of postoperative MRSE were documented. Pentacam was scheduled 6 months following surgery to assess postoperative topography, front surface Q-value at 6 mm, RMSh, K readings, central and mid-peripheral ...
For practical design, we resort to four-layered square patch structures (layers I, II, III, and IV), one-layer frequency selective surface (FSS) (layer V), and one-layer crossbar (layer VI) in a composite meta-atom with negligible crosstalk at low and upper frequencies of f 1 and f...