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Research on Measurement of Diffraction Efficiency of the Beam Sampling Grating by Imaging Method

Author: SunZuo
Tutor: WuJianHong
School: Suzhou University
Course: Optical Engineering
Keywords: K e y w o r d s B S G d i f f r a c ti o n e ff ic ie n c y D O E l i ght i n te n si t y me a su r em e n t LD W h o lo gr ap hi c in te rf e ro me tr y
CLC: O436.1
Type: Master's thesis
Year: 2012
Downloads: 28
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Abstract

Measurement of diffraction efficiency of the beam sampling grating (BSG) by imaging method were investigated theoretically and experimentally in the thesis. In the ICF system, the diffraction efficiency of the BSG is an significant indicator, its measurement is especially important for the production and use of the BSG by providing feedback.First, the imaging method of the diffraction efficiency of BSG is proposed:Setting the structure of measurement reasonably making the object plane (diffractive element) and the transforming plane formed the imaging relationship, and the matrix CCD measured of the light intensity in the transforming plane, the diffraction intensity distribution of the diffractive element can be derived according to the imaging relationship.Secondly, two kinds of measurement structures which accord with the imaging method were given:the imaging method of "pinhole imaging" and the imaging method of "conjugate relation". The theoretical simulation and experimental verification were processed respectively for the two kinds of measurement structures, and for the measurement of diffraction efficiency of the BSG by small dimension matrix CCD, it is more suitable to use "the object-image conjugate relationship" imaging method. The measure optical path used for diffraction efficiency of the BSG was built based on the "the object-image conjugate relationship" imaging method. The conversion relation of diffraction efficiency was analyzed and the problem of calibration in the light intensity measurement was discussed.Then, to start with the principle of holographic interference, the compensation element was designed which meet the demand of fabrication precision of laser direct w r it i n g (LD W). T h e f o r mu la o f ho lo g r a m fr in ge p o si t i o n w a s de d u c e d a n d th e fr in g ed is t r ib ut io n can b e s e a r c he d u si n g th e N e w to n it e r a ti o n a lg o r it h m. T h e f r in ge d is t r ib u t i o nis tr a n sf o rme d to " b mp " f il e s of p ix e l-ma tr ix for pr o d u c ti o n us i n g g r a ph ic al la se r d ir e c tw r it i n g eq u ip m e n t.Fin all y, th e r e c o r di n g p a r a me te r s o f th e co mp e n sa ti o n e le me n t w a s o p ti m i ze d b yZ em a x, a nd th e c o mp e n sa ti o n e le me n t w a s p rod u c ed b y h ol o gra p h ic e xp o su r e. T h eme a su r e me n t o f th e im a g i n g me th o d o f th e d if fr a c ti o n e f f ic ie n c y o f B SG w as bu il t w h ic his me et th e im a gin g me th o d o f "th e o b je ct-im a g e c o n j u g a te r e la ti o n sh ip ". T h e li g h tin te n si t y w a s me a su r ed u se f o r qu a li t a ti v e a n a ly si s a n d t h e f e a si b il i t y o f th e im a gin gme th o d o f th e di f fr a c ti o n e f f ic ie nc y of BSG w as v er if i e d.Co mp ar e d wi t h th e me th o d of me a su r e p a ral l a x p o in t b y p oi n t, th e c o mp le x o p ti c a le le me n t a nd th e te s t i ng l i ght p a th is a ba n d on e d. in th is n e w me th o d, a nd th e p r ob le m of th ed if f r a c ti o n d ir e c ti o n v a r y w it h me a su r e d p o in t is a v oi d e d, w h e n r e ce iv i n g li g h t in t e ns i t y.

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CLC: > Mathematical sciences and chemical > Physics > Optics > Physical optics ( wave optics ) > Interference and diffraction
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