實驗4光的折射、偏振、干涉和繞射lab.4refraction,polarization.pptVIP

PhysicsNTHU MFTai戴明鳳 實驗 4 :光的折射、偏振、干涉和繞射Lab.4 - Refraction, Polarization, Interference and Diffraction of Light To observe the various phenomena of light To study some important foudatmental optical principles. A. Refraction Index of Prism (三稜鏡的折射率) B. Polarization of Light (光的偏振) C. Thin-Film Interference of Air Wedge (空氣楔的薄膜干涉) D. Multi-reflective Interference in Glass (玻璃片內多次反射的干涉) E. Diffraction of Light (光的繞射) 一、雷射使用的基本安全規則 雷射光很容易對視網膜造成永久性的傷害，切記絕對不可將雷射光直接對著自己或他人的眼睛射照。 雷射光經光滑表面反射得的雷射光也可能會對眼睛造成嚴重的傷害，所以雷用使用操作時也要隨時留意，避免經雷射的反射光照射到自己或他人的頭部。 高功率的雷射光，縱使不是經光滑表面反射，而是經過一般粗糙的表面散射後，仍極有可能對人的眼睛、甚或人體造成不小的傷害。所以，高功率雷射更要嚴格遵守使用雷射的相關安全規範。 雷射的內部通常含有高壓電源裝置，特別是高功率雷射，故未經允許不可隨意開啟儀器外殼，以免發生高壓觸電的危險。 雷射電源線的插頭必須是含有地線的安全插頭，且必須插到接有地線的電源插座上。以防萬一雷射內部漏電，電流可經由接地線快速流通到地下，才不致傷害人體。 二、雷射危險度分級與防範對策Ref: .tw/~ygwu/lasar_safety.doc 雷射危險度的分類 雷射處理上的安全對策 雷射對眼睛的傷害 雷射光對皮膚的傷害 I. Laser Safety Rulers Class 1 Lasers A warning sign indicating the laser classification should be placed in a visible location on the laser. Class 2 Lasers Do not stare at the laser or permit any person to stare at the laser beam. Do not point the laser at a persons eye. Class 3 Lasers Never aim a laser beam at a persons eye. Use proper safety eyewear if there is a chance that the beam or hazardous specular reflection will expose the eyes. Only experienced personnel should be permitted to operate the laser. Never leave an operable laser unattended if there is a chance that an unauthorized person may attempt to use it. A key switch should be used. A warning light or buzzer should indicate when the laser is operating. Enclose as much of the beam path as possible. Avoid placing the unprotected eye along or near the beam axis as attempted in some alignment procedures since the chance of hazardous specular reflection is greatest in this area. Terminate the primary and secondary beams if possible at the end of their useful paths. Use beam shutters and output filters to reduce the beam power to less hazardous levels when the full