光学衍射场的计算与研究

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1、-y'I§f东北大学硕士学位论文AbstracteComputationandResearchofOpticalDiffractiFieldAbstractDiffractionisveryimportantinoptics．Butthediffractionsinnear-fieldandoff-axissituationsarehardlyresearchedwithexistingdiffractiontheoryandnormaldiffractionexperiment．Thispapersolvedtheseproblemssuccessfu

2、llyusingthecomputersimulationexperiment．Soithasagreatmeaning．Thefollowingworkshavealreadybeendone：Simulatingtheopticaldiffractionaccuratelyusingthecomputerandhavingdiffractionpatternsinvarioussituations．Afterthatamoredeeplycomputationandresearchhasbeendonesubsequentlyandthatiswha

3、twasintroducedinthispapeeThetheorybasedoninthisresearchisHuygens-FresnelprincipleandHuygenswaveletconception．AtheoreticalderivationWasmadetoobtaintheintensitydistributionformulaofthesecondarydiffraction．Particularly,theformulahasmoresimpleformwhentheapertureisorigin—symmetric．And

4、thispapercomparesthedatacomputedfromtheoreticalformulaofthesecondarydiffractionandtheprimarydiffractionwiththesameparameters．Thesameresultsshowthatthesecondarydiffractionisthecontinuouspropagationofthelightwavewhichcomesfromtheprimarydiffractionpatterns．AnditalsoconfirmstheHuygen

5、swaveletconceptionthroughtheexperimentmethod．Thecomparisonbetweenthetheoreticalderivationandtheexperimentaldataofthesecondarydiffractionwasgivenandtheyshowthesameresults．Thispaperalsoanalyzestwospecialcasesofthesecondarydiffractionthroughthefurtherderivationofthetheoreticalformul

6、a．Andthetheoreticalderivationgivesacompletelynewunderstandingaboutdiffraction．Theresearchhasbeendonetofindthechangelawofthesecondarydiffractionpattemsvarywiththediffractiondistanceoraperture’Ssize．Inaddition，thispaperputsforwardtwomethodstocomputeaperture’Sinformationwhilethediff

7、ractionpattemisknown．ThesetwomethodsareFouriermethodanddichotomy．TheformerofthembasesontherelationbetweendiffractionandFourierTransform．ThelatterbasesonthedichotomywhichCandeterminetheoptimalsolutioninthenumericalanalysis．．．III．．东北大学硕士学位论文AbstractKeywords：diffraction；thesecondary

8、diffractionHuygens-Fresnelprinciple；wave