Off-axis Fresnel numbers in laser systems-中国期刊网

摘要 ThephysicalmeaningandessenceofFresnelnumbersarediscussed,andtwodefinitionsofthesenumbersforoffaxisopticalsystemsareproposed.TheuniversalFresnelnumberisfoundtobeN=(a2/λz)*C1+C2.TheRayleigh–Sommerfeldnonparaxialdiffractionformulastatesthatasimpleanalyticalformulaforthenonparaxialintensitydistributionafteracircularaperturecanbeobtained.TheoreticalderivationsandnumericalcalculationsrevealthatthefirstcorrectionfactorC1isequaltocosθandthesecondfactorC2isafunctionoftheincidentwavefrontandtheshapeofthediffractiveaperture.Finally,somediffractionphenomenainoff-axisopticalsystemsareexplainedbytheoff-axisFresnelnumber.

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Off-axis Fresnel numbers in laser systems

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Off-axis Fresnel numbers in laser systems

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