In response to a perceived need in the vision community, an OSA taskforce was formed at the 1999 topical meeting on vision science and its applications (VSIA-99) and charged with developing consensus recommendations on definitions, conventions, and standards for reporting of optical aberrations of human eyes. Progress reports were presented at the 1999 OSA annual meeting and at VSIA-2000 by the chairs of three taskforce subcommittees on (1) reference axes, (2) describing functions, and (3) model eyes.

Standards for reporting the optical aberrations of eyes

This work was supported by Ministerio de Economia, Industria y Competitividad (Spain) under projects FIS2017-82919-R (MINECO/AEI/FEDER, UE) and FIS2015-66570-P (MINECO/FEDER), and by Generalitat Valenciana (Spain) under project PROMETEO II/2015/015.

/pdf/roadmap-on-holography-289uo7kvcp.pdf

Roadmap on holography

A holographic wavefront sensor inclusive of a multiplexed hologram that can reconstruct one or more diffracted beams from a single object or input beam onto a distant image plane. The position of the reconstructed beams on the distant image plane indicates the relative amounts of different aberrations present in the input beam. Optical and computer realization of the employed hologram are accomplished along with sensor configurations in simple and more complex uses.

Holographic wavefront sensor

The process of Zernike mode detection with a Shack-Hartmann wavefront sensor is computationally extensive. A holographic modal wavefront sensor has therefore evolved to process the data optically by use of the concept of equal and opposite phase bias. Recently, a multiplexed computer-generated hologram (CGH) technique was developed in which the output is in the form of bright dots that specify the presence and strength of a specific Zernike mode. We propose a wavefront sensor using the concept of phase biasing in the latter technique such that the output is a pair of bright dots for each mode to be sensed. A normalized difference signal between the intensities of the two dots is proportional to the amplitude of the sensed Zernike mode. In our method the number of holograms to be multiplexed is decreased, thereby reducing the modal cross talk significantly. We validated the proposed method through simulation studies for several cases. The simulation results demonstrate simultaneous wavefront detection of lower-order Zernike modes with a resolution better than λ/50 for the wide measurement range of ±3.5λ with much reduced cross talk at high speed.

Differential modal Zernike wavefront sensor employing a computer-generated hologram: a proposal

The present application provides a radio frequency identification (RFID) transponder and a method for fabricating the same. The RFID transponder, comprising: a microchip which is arranged to communicating with a reader; a battery which is arranged to provide an electrical power for operating the transponder, and is attached to the microchip by means of a conductive path; an antenna which is arranged to receive and backscatter radio frequency interrogation radiation; and a substrate, on which the microchip, the battery and the antenna are arranged.

Rfid transponder and a method for fabricating the same

A matrix of explosive cells can include plural explosive cells formed in an array in a common substrate. Each cell can be formed as a recess filled with explosive material. An ignition device has an addressable ignition source for each cell. This matrix can be used in combination with a projectile guidance system. The projectile guidance system includes an antenna, a transceiver and a control processor. A method of guiding a projectile can include firing a projectile at a target, tracking the projectile and the target, determining a desired change in a flight path of the projectile, transmitting guidance commands to effect the desired change in the projectile's flight path to the projectile, receiving the guidance commands onboard the projectile and selectively igniting an explosive cell in a matrix of addressable explosive cells contained in a common substrate using the guidance commands.

Method and device for matrix of explosive cells

A long-life embedded structure sensor, remote long-life fluid measurement and analysis system, long-life off-grid enclosed space proximity change detector, surface-mount encryption device with volatile long-life key storage and volume intrusion response, and a portable encrypted data storage with volatile long-life key storage and volume intrusion response are provided to be powered by and equipped with a long-life power source that can provide operative power for at least a twenty year duration

Long-life power source, long-life embedded structure sensor, remote long-life fluid measurement and analysis system, long-life off-grid enclosed space proximity change detector, surface-mount encryption device with volatile long-life key storage and volume intrusion response, and portable encrypted data storage with volatile long-life key storage and volume intrusion response

We describe a modal wavefront sensing technique of using multiplexed holographic optical elements (HOEs). The phase pattern of a set of aberrations is angle multiplexed in a HOE, and the correlated information is obtained with a position sensing detector. The recorded aberration pattern is based on an orthogonal basis set, the Zernike polynomials, and a spherical reference wave. We show that only two recorded holographic patterns for any particular aberration type are sufficient to allow interpolated readout of aberrations to λ/50. In this paper, we demonstrate the capability of detecting errors between ±2λ PV for each orthogonal set at rates limited only by the speeds of the detection electronics, which could be up to 1 MHz. We show how we take advantage of the unavoidable intermodal and intramodal cross talks in determining the type, amplitude, and orientation of the wavefront aberrations.

Holography-based wavefront sensing

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Method and device for matrix of explosive cells

Holography-based wavefront sensing