scholarly journals APPLICATION OF OPTICAL DIFFRACTOMETRY FOR THE ERROR MONITORING OF MANUFACTURING OF PRECISION OPTICAL ELEMENTS

2021 ◽  
Vol 8 ◽  
pp. 223-228
Author(s):  
Ruslan V. Shimansky ◽  
Andrey Yu. Kostyanichnikov ◽  
Roman I. Kuts ◽  
Dmitriy A. Belousov ◽  
Victor P. Korolkov
Keyword(s):  
Experimental Study ◽  
Diffraction Efficiency ◽  
Duty Cycle ◽  
Optical Element ◽  
Diffraction Gratings ◽  
Diffractive Optical Element ◽  
Error Monitoring ◽  
Optical Elements ◽  
Mutual Displacement

The work is devoted to an experimental study of the effectiveness of the method for measuring errors in manufacturing of computer-generated synthesized holograms using specialized marks. Each mark represents two aligned diffraction gratings with the same duty cycle and period, the first of which is formed before writing, and the second is formed in the process of forming the structure of the hologram. To determine the writing error, the method of optical diffractometry was used. The results of an experimental study of dependence of diffraction efficiency of the mark on the mutual displacement of parts of the microgratings are presented. The error manufacturing of a synthesized hologram arising during long-term writing of a diffractive optical element has been simulated experimentally.

Design of Multi-Layer Diffractive Optical Element with Bandwidth Integral Average Diffraction Efficiency

2010 ◽  
Vol 30 (10) ◽  
pp. 3016-3020
Author(s):  
薛常喜 Xue Changxi ◽  
崔庆丰 Cui Qingfeng ◽  
潘春艳 Pan Chunyan ◽  
佟静波 Tong Jingbo
Keyword(s):  
Diffraction Efficiency ◽  
Optical Element ◽  
Diffractive Optical Element ◽  
Integral Average

Effect of Incident Angle on Diffraction Efficiency of a Two-Layer Diffractive Optical Element

2009 ◽  
Vol 29 (1) ◽  
pp. 120-125 ◽  
Author(s):  
裴雪丹 Pei Xuedan ◽  
崔庆丰 Cui Qingfeng ◽  
冷家开 Leng Jiakai
Keyword(s):  
Diffraction Efficiency ◽  
Incident Angle ◽  
Optical Element ◽  
Diffractive Optical Element

scholarly journals Computer synthesis of diffractive optical elements for forming 3D images

2017 ◽  
pp. 11-19
Author(s):  
С.Р. Дурлевич
Keyword(s):  
Optical Element ◽  
Diffractive Optical Element ◽  
Diffractive Optical Elements ◽  
Optimal Parameters ◽  
Optical Elements ◽  
Standard Equipment ◽  
3D Images ◽  
Security Feature ◽  
Diffractive Element ◽  
Visual Security

Предложен метод расчета и синтеза микрорельефа дифракционного оптического элемента, формирующего новый визуальный защитный признак - эффект смены одного 3D-изображения на другое 3D-изображение при повороте дифракционного оптического элемента на 90 градусов. Разработаны эффективные алгоритмы расчета микрорельефа дифракционного оптического элемента. Методами математического моделирования определены оптимальные параметры дифракционного оптического элемента. С помощью электронно-лучевой технологии изготовлены образцы оптических защитных элементов, формирующих визуальный эффект смены 3D-изображений при освещении оптического элемента белым светом. Разработанные оптические элементы могут тиражироваться с помощью стандартного оборудования, используемого для изготовления защитных голограмм. Новый защитный признак легко контролируется визуально, надежно защищен от подделки и предназначен для защиты банкнот, документов, идентификационных карт и др. A method is proposed to compute and synthesize the microrelief of a diffractive optical element to produce a new visual security feature: alternation of two 3D color images when the diffractive element is rotated by 90 degrees. Effective algorithms for computing the micro-relief of an optical element are developed. Optimal parameters of the diffractive optical element are determined using methods of mathematical modeling. Sample optical security elements that produce 3D to 3D visual switch effect when illuminated by white light were manufactured using the electron-beam lithography. The optical elements developed can be replicated using a standard equipment employed for manufacturing security holograms. The new optical security feature is easy to control visually, safely protected against counterfeit, and designed to protect banknotes, documents, ID cards, etc.

scholarly journals The parameters effect on the holographic optical elements

2011 ◽  
Vol 8 (2) ◽  
pp. 429-434
Author(s):  
Baghdad Science Journal
Keyword(s):  
Diffraction Efficiency ◽  
Diffraction Grating ◽  
Optical Element ◽  
Band Width ◽  
Optical Elements ◽  
Yag Laser ◽  
Holographic Optical Element ◽  
Dichromated Gelatin ◽  
532 Nm ◽  
Grating Thickness

In this work we fabrication holographic optical element diffraction grating thickness 40?m and mirror90?m by using dichromated gelatin,to perform that we have to use the Nd-yaG laser doubling frequency of wavelenght (532)nm and its powers of (80)mWatt.we have studyed the thickness and concentration dichromat effect in mirror reflaction ,effect of angle of reconstruction beam in band width and diffraction efficiency ,study effect gelatin hardener of the diffraction efficiency.

scholarly journals STUDY ON HIGH RESOLUTION MEMBRANE-BASED DIFFRACTIVE OPTICAL IMAGING ON GEOSTATIONARY ORBIT

2017 ◽  
Vol XLII-1/W1 ◽  
pp. 371-375 ◽  
Author(s):  
J. Jiao ◽  
B. Wang ◽  
C. Wang ◽  
Y. Zhang ◽  
J. Jin ◽  
...  
Keyword(s):  
High Resolution ◽  
Optical Imaging ◽  
Diffraction Efficiency ◽  
Imaging System ◽  
Optical Element ◽  
Chromatic Aberration ◽  
Geostationary Orbit ◽  
Optical Elements ◽  
Optical Imaging System ◽  
High Diffraction

Diffractive optical imaging technology provides a new way to realize high resolution earth observation on geostationary orbit. There are a lot of benefits to use the membrane-based diffractive optical element in ultra-large aperture optical imaging system, including loose tolerance, light weight, easy folding and unfolding, which make it easy to realize high resolution earth observation on geostationary orbit. The implementation of this technology also faces some challenges, including the configuration of the diffractive primary lens, the development of high diffraction efficiency membrane-based diffractive optical elements, and the correction of the chromatic aberration of the diffractive optical elements. Aiming at the configuration of the diffractive primary lens, the “6+1” petal-type unfold scheme is proposed, which consider the compression ratio, the blocking rate and the development complexity. For high diffraction efficiency membrane-based diffractive optical element, a self-collimating method is proposed. The diffraction efficiency is more than 90 % of the theoretical value. For the chromatic aberration correction problem, an optimization method based on schupmann is proposed to make the imaging spectral bandwidth in visible light band reach 100 nm. The above conclusions have reference significance for the development of ultra-large aperture diffractive optical imaging system.

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