Diffraction efficiency

About: Diffraction efficiency is a research topic. Over the lifetime, 10320 publications have been published within this topic receiving 158298 citations.

Stretching and compression of laser pulses by means of high efficiency volume diffractive gratings with variable periods in photo-thermo-refractive glass

Abstract: High efficiency reflective volume Bragg gratings with chirped gratings recorded in photo-thermo-refractive glass having an absolute diffraction efficiency exceeding 95% in transmitting and reflecting modes are used to stretch and/or compress ultrashort laser pulses with high efficiency. Robustness, compactness, thermal and laser stability along with placement of multiple elements in the same space provides femtosecond laser system with high efficiency of stretching and re-compression of femtosecond pulses.

Design of diffractive optical elements for multiple wavelengths

Abstract: A method for producing diffractive optical elements (DOE’s) for multiple wavelengths without chromatic aberration is described. These DOE’s can be designed for any distinct wavelength. The DOE’s are produced from two different optical materials, taking advantage of their different refractive indices and dispersions.

Chromatic-distortion compensation in splitting and focusing of femtosecond pulses by use of a pair of diffractive optical elements.

Abstract: We propose a simple optical system to compensate for chromatic distortion that occurs during fan-out of femtosecond pulses by diffractive optics. The proposed system comprises a pair of diffractive elements, one for splitting an incoming pulse and the other for focusing the split pulses. With an appropriate separation between the elements, chromatic distortion resulting from the spectral bandwidth of a femtosecond pulse is removed, and an array of focused pulses with the same dimensions can be obtained. The theory has been verified through optical and processing experiments with 100-fs, 800-nm pulses.

Implementation of optical interconnections for VLSI

Abstract: This paper reports on the progress in implementing optical interconnections for VLSI. Four areas are covered: 1) the holographic optical element (HOE), 2) the laser sources, 3) the detectors and associated circuits forming an optically addressed gate, and 4) interconnection experiments in which five gates are actuated from one source. A laser scanner system with a resolution of 12 µm × 20 µm has been utilized to generate the HOE's. Diffraction efficiency of the HOE and diffracted spot size have been measured. Stock lasers have been modified with a high-frequency package for interconnect experiments, and buried heterostructure fabrication techniques have been pursued. Measurements have been made on the fabricated photodetectors to determine dark current, responsivity and response time. The optical gates and the overall chip have been driven successfully with an input light beam, as well as with the optical signal interconnected through the one to five hologram.