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大学物理实验报告英文全息照相.docx

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physicallabreport:Holography Writer: [Backgrounds] Lightsareelectromagneticwaves. Amonochromaticopticalwavecanbemathematicallyexpressedasawaveequation: whereAistheamplitudeandcarriesphaseinformation.Thewayweviewanygivenobjectistoobservethebrightness(amplitude),color(wavelength),andshape/distance(phase). Aconventionalphotographrecordsthefocusedimageofanobjectonaphotographicfilmorplate.Ahologramisaphotographicrecordingofanopticalinterferencepattern.Theamplitudeandphaseoflightcomingfromtheobjectarestoredinthehologram.Thephaseinformationenablesustoreconstructtheoriginalwavefrontandhenceobtainathree-dimensionalimageinspace. Theholographyyouexperienceinthislabwillconsistoftwosteps,a)recording:theamplitudeandphaseinformationofanobjectisrecordedonafilm,b)viewing:illuminatingthefilmtoreconstructtheobjectthatwasbeingfilmed. Thisexperimentusesa658nmdiodelaserasasourceofcoherentlightwhichirradiatestheobjects,andalsoprovidesareferencebeamofuniformamplitudeandphase. [Process] 1.Recording Attheverybeginning,wepreparelightpathaccordingtoFig.First,wehaveadarkenvironment.Thenweadjustthepathlengthofthereferenceandobjectbeam,sothatthepathdifferenceissmall.Then,weadjustthedevicessothatboththeobjectandreferencebeamsareirradiatingthefilmareauniformly. Teachertoldusthattheratiobetweentheobjectandreferencebeamsshouldbetterbebetween1:1to1:10.Thenmypartnerkeepadjustingtheopticstilltheseconditionsaremet.Successfullywegetanopticalfilm(wrappedinblackpaper)andmountitontotheholder.Then,weexposethefilmtolightforabout0.5second,thendismountthefilm. FigureSEQFigure\*ARABIC1:recordingofahologram 2.Filmdevelopment Aftergettingafilm,wetakeittothedarkroomtodevelop.Therearethreebathbasins:developer,stopbath(water),andfixer.Accordingtotheinstructor,weimmersethefilmintodevelopmentliquid.Mypartnerflipthefilmupanddownwiththetweezersandwewaittillthegray-scaleissimilartothecoloronthebottomofthebasin.Thisusuallytakes2minutesand25seconds. Later,werinsethefilminthewaterbasinfor25seconds,andwetakeittothefixer.I