Dissertation
Dissertation > Industrial Technology > Radio electronics, telecommunications technology > Photonics technology,laser technology > Laser technology, the maser

Laser Beam Shaping Based on Liquid Crystal Spatial Light Modulator

Author WangLianBao
Tutor HuJiaSheng
School Dalian University of Technology
Course Signal and Information Processing
Keywords Beam shaping A liquid crystal spatial light modulator The cover teacher Berger - Isaac Stone algorithm PMA- smooth correction hybrid algorithm
CLC TN24
Type Master's thesis
Year 2011
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The laser beam emitted light intensity Gaussian distribution , the propagation path of the hyperbolic nature largely restricts the application and development of laser technology . For example : in the processing of some semiconductor flattened beam can be improved laser energy processing window thereby improving efficiency ; in laser projection printing requires uniform light intensity ; , far field light source requires a uniform illumination in the laser radar and the coherent imaging . Gaussian laser beam shaping space , upcoming Gaussian beam shaping for the flat-top beam . This article using a liquid crystal spatial light modulator , the beam shaping , by changing the phase function of the liquid crystal spatial light modulator to achieve real time shaping of the Gaussian beam , is a controllable and efficient beam shaping method . The content of this article can be divided into the following aspects : First , the analysis of a typical beam shaping technology in the field of laser shaping , and compare their advantages and disadvantages . The development status and working principle of the liquid crystal spatial light modulator , summarize the advantages of using a liquid crystal spatial light modulator for beam shaping . Second, the study of a liquid crystal spatial light modulator phase function design principle and common optimization iterative algorithm , PMA- smooth Berg - Isaac Stone cover division algorithm based on modified hybrid algorithm , reducing the output beam top of the unevenness and the root mean square error , and using the algorithm to complete the design of the liquid crystal spatial light modulator the phase function . Again, the design and completed based on the liquid crystal spatial light modulator a beam shaping experiment . This article using a liquid crystal spatial light modulator the phase modulation characteristics , combined with the PMA- smoothing correction hybrid algorithm designed experimental optical path , optical experiment , to achieve a Gaussian beam intensity shaping near \using a liquid crystal spatial light modulator for beam shaping, the beam shaping is an effective method .

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