A new method for correcting comatic aberration in holographic opticalsystems which uses constant optical path(COP) has been developed. The sum ofthe optical path lengths from an object wavefront to an image wavefront ...
详细信息
ISBN:
(纸本)0819403954
A new method for correcting comatic aberration in holographic optical
systems which uses constant optical path(COP) has been developed. The sum of
the optical path lengths from an object wavefront to an image wavefront remains
constant, and achromatic holographic systems can be easily calculated. Using COP,
a new focusing triplet was designed with wavelength tolerance of 9 nm for
entrance and exit numerical apertures of 0.5. This is 15 times larger than that
for conventional single holographic lens.
Many fundamental astronomical problems need much higher resolution than is afforded by atmospheric visibility or the diffraction limit of even the largest telescope being planned. The only way to meet these demands is...
详细信息
ISBN:
(纸本)0819403954
Many fundamental astronomical problems need much higher resolution than is afforded by atmospheric visibility or the diffraction limit of even the largest telescope being planned. The only way to meet these demands is by a distributed array of telescopes similar to those used in radio astronomy, or the long baseline stellar interferometry. China is planning to build a small-aperture long- baseline stellar optical interferometer for three purposes. One purpose is to clear up some problems before building a large and expensive interferometer. The second is to measure angular diameters of stars and angular distances between double stars. The third is to modify it for astrometry use in the future. In this paper, the design tolerance and specifications of the interferometer are discussed based on the astronomical requirements.
Laser induced damage to optical components severely limits the operatingfluence of high peak power lasers used for fusion research such as the Nova laserat the Lawrence Livermore National Laboratory. In particular, su...
详细信息
ISBN:
(纸本)0819403954
Laser induced damage to optical components severely limits the operating
fluence of high peak power lasers used for fusion research such as the Nova laser
at the Lawrence Livermore National Laboratory. In particular, surfaces and
optical thin films often damage at a lower fluence than bulk materials in large
aperture, high quality optics. We have designed and are fabricating new 94 cm
turning mirrors for Nova as part of the "Precision Nova" program to improve
beam quality. A new design has been optimized for updated optical performance
specifications including increased damage resistance. The new mirror design
will operate at all turning angles required by the ten Nova beamlines. This
flexibility reduces mirror inventory and fabrication cost. A process of
"conditioning" the mirror coating has been developed that is permanent and
increases the damage threshold by as much as a factor of 2-3x.
A nematic liquid crystal Fabry-Perot interferometer (NLC-FPI) based on nematic material in a parallel configurationis described, for applications in astronomy. This device allows spectral chopping for an efficient rem...
详细信息
ISBN:
(纸本)0819403954
A nematic liquid crystal Fabry-Perot interferometer (NLC-FPI) based on nematic material in a parallel configuration
is described, for applications in astronomy. This device allows spectral chopping for an efficient removal of background
radiation, when the source is embedded in a strong background such as the solar corona or IR sources. The
primary design is intended for two-dimensional spectroscopic imaging. This method is also very useful for precision
spectropolarimetry. The NLC-FPI is a tunable, double-channel filtec we present some theoretical and experimental
results obtained on a first generation pmtotype.
The Shack-Hartmann (S-N) wavefront sensor, which is derived from the classical Hartmann testing method, is one of the most convenient methods available for the optimal testing of telescopes on site on natural stars. I...
详细信息
ISBN:
(纸本)0819403954
The Shack-Hartmann (S-N) wavefront sensor, which is derived from the classical Hartmann testing method, is one of the most convenient methods available for the optimal testing of telescopes on site on natural stars. It also has many applications in adaptive optics, active optics and CAM of optical mirror. The principle of the method is explained. Light from the tested source and from a reference source is collimated by a lens and incides upon an S-H plate which is a lens array. Each lenslet forms two point images. The distance between each pair of images reflects the angular aberration of the tested wavefront over the subaperture. A method of producing S-N plates with GRIN rod lenses is described. The experimental S-H plate has 10x10 GRIN rod lenses.
Theoretical description of phase discretization and quantization is provided for coaputer generated opticaleleients (CGOK). Suitable estiiations of seanaquared and iaxiaui aberrations, Strehl nuaber and aean wavefront...
详细信息
ISBN:
(纸本)0819403954
Theoretical description of phase discretization and quantization is provided for coaputer generated optical
eleients (CGOK). Suitable estiiations of seanaquared and iaxiaui aberrations, Strehl nuaber and aean wavefront
deviation are derived in dependence of discretization and quantization paraieters. A diffractive aberration corrector
for thin len5 and also phase diffractive coipensator for aspheric wavefront foriation are investigated as
exasples,
1 . PROBLEM OF CGOE D ISCRETI ZAT ION AND QUANTI ZAT ION.
Wide-range possibilities of coaputer generated holograis and optical eleients1' are soietiies liiited by
discretization of their phase transfer function. The known aethods for studying phase nonlinearities treat
quantization as a superposition of iany diffraction orders but do not take discretization into account.
In this paper coibined studying of discretization and quantization is perforied for siooth phase functions such as
of zoned phase plates, coipensators, Fresnel lenses and siiilar type CGOK.
Digital holography applications provide us coiputer generated optical elesents including kinoforis' with purely
phase-type t'ransfer function
r (t) exp{***25rrrt (p(a)] (1)
where • : (u,v) are 2-D Cartesian coordinates in the CGOI's plane, 'f (ii) is the phase shift perforied in point IT,
iod2,,,tf ) is the value of 'p the aodulo (2ira), 1:1 or another positive nuiber. Coiputer-aided design of CGOK
includes calculation of digital saiples for 'P function brought to [O,2%a) interval, driving suitable nak generator
to access grey-level or binary iasks. Grey-level iasks used in bleaching or photopolyaer technology yield a CGO with
variable iicrorelief thickness. optical lithography with a set of binary aasks or iulti-stepped electron-beaw
lithography yields aulti-level COOK described by quantization of 'P . Raster scanning iask generator set up all saska
iI the field G fros so called resolution cells G7that are centered in i;point, enuierated by dou
The Proceedings of the Conference contains 27 papers representing the very latest developments in the optical and opticalengineering subject areas not covered in the other conferences at the annual San Diego meeting....
详细信息
The Proceedings of the Conference contains 27 papers representing the very latest developments in the optical and opticalengineering subject areas not covered in the other conferences at the annual San Diego meeting. This Proceedings includes papers on basic opticaldesign and engineering, e.g. the optomechanical laboratory hardware, its organization, terminology and devices;a precision dual positioning system;a Wollaston polarizer in imaging systems;a 20-element long focal length zoom lens;photolithographic lenses;a reflection microcirculation microscope. The session on optical fabrication and testing includes papers on computer simulation of interferometer performance;adaptive optics wavefront corrector using addressable liquid crystal retarders;microlens array manufacture;design of Shack-Hartmann plate with GRIN rod lenses;Chinese adaptive astronomical telescope. The session on waveguide and diffractive optics and microlithography comprises papers on the fabrication of ion-exchanged glass channel waveguides with etched and diffused grating taps;modular fiber optic assembly technique;forward photorefractive multibeam mixing in BaTiO3;correcting chromatic aberration in holographic optical systems. Miscellaneous topics include articles on optomechanical properties of PMMA and their applications in pressure sensors and on a Fabry-Perot tunable filter for visible and near IR using nematic liquid crystals.
The developtent of three hi4i resolution miniature cRT 's for the He1ut ?'buntedDisplay Alication is described with reference to the detailed construction.The design considerations for such tubes are discuss1 ...
详细信息
ISBN:
(纸本)0819403415
The developtent of three hi4i resolution miniature cRT 's for the He1ut ?'bunted
Display Alication is described with reference to the detailed construction.
The design considerations for such tubes are discuss1 with reference to the
trade offs in terms of display perfonrnce arxI physical parareters . current
state of the art arxi future performance potential is indicated.
The authors demonstrate single-mode highly-parallel Holoplanar VLSI interconnects, either in single-planar or multi-planar architecture, based on planar volume (Bragg) holographic gratings. The design includes highly ...
详细信息
The authors demonstrate single-mode highly-parallel Holoplanar VLSI interconnects, either in single-planar or multi-planar architecture, based on planar volume (Bragg) holographic gratings. The design includes highly arbitrary, rugged and flexible multiplex volume holographic gratings implanted in single-mode waveguides in two basic multiplexed topologies: holoplanar and total internal reflection. The holoplanar interconnects connect two or more single-mode planar beams in fan-in, fan-out, star, tree, bus, WDM, and other architectures, and the TIR interconnects connect 3D (free-space) multi-beams with planar multi-beams in a variety of multiplexed configurations. They can be used in LAN and WAN communication, supercomputers, optical computing, neural networks, optical storage, phased array antennas, optical sensing, etc. currentdevelopments include an optical clock, optical bus, optical look-up table, board-to-board backplane interconnects, integrated optical heads, time-shift networks, and high-density WDMs (wavelength-division-multiplexers).
An optical lens system with varying magnification has been designed for a 70-mm image format. Twenty optical elements were needed to provide for the 345- to 1050-mm focal length zoom range as well as the proper color ...
详细信息
An optical lens system with varying magnification has been designed for a 70-mm image format. Twenty optical elements were needed to provide for the 345- to 1050-mm focal length zoom range as well as the proper color correction over the visible spectrum. A 4-in diameter port window limits the fl# of the optical lens system. Operation of the lens system is done by actuating stepping motors through a MacPlus computer. This lens system was designed for Los Alamos National Laboratory Group M-8, because no commercial zoom lens existed that would change its reduction from 1/15 to 1/4 at a focusing range of 5 meters. Additionally, we required a larger, non-standard image size that could be recorded by a rotating mirror streak camera. A Nikkor lens sales manual does offer a long focal length, 35-mm lens only upon special order. The closest focusing range of this Nikkor lens is 6 meters.
暂无评论