光学教程(叶玉堂)第5章光的干涉课件.ppt

1、10111012022202coscosEEtk rEEtk r当相位差为其它值时，光强介于最大值和最小值之间。1 22112211222/coscos1/1cosI IIIVIIIIIIVIII1201022cosIE E01020:/2EEor121 221212cos2/1/IIII IVIIII2002(1cos)4cos(/2)III121 22cosxyIIIIII I激光分波面双光束干涉不定域干涉，干涉强 度较弱。21n rr 当n=1时22004cos24cos/IIIydD0222201/22cos/22sin/2n ABBCn ANnhh nn 或者：121 222cosI

2、III I00121NNnNffnrnhnh N 222201122cos/22sin/22/2nhh nnnh 或者若：22hnn 相邻条纹对应的厚度差：条纹的间距：条纹间距与楔角有关，与入射波长有关。白光入射则得彩色条纹。0,1,2,0,1,2,mmrmRnmrmRm暗环半径亮环半径222nh1/2mRm 001022301022010000exp1expexp1exp1Re()rrlrllrillrilriEEEEr ttEi lEr tt EitiliREExp i 其中：1trII0111rMirmtMitmiFIIIFIIIIF22121rtFRVVFR22sin1 cos221s

3、in11 cos22ritiIFFIIFFI 2 14RFR21RNR4cosnhc1/221/22(1)2(1)cos2cosmmvRnhRmNmNnh RmR02002nnRnn2202101222021012/n nnnnnRn nnnnn102nn n20122012/nnnRnnn2112/nnn0101nnRnn210222202102121221220210212002122211/1/1 41 4ppppHHppLppppnLppHHnnn nnnnnRnnnnn nnnnRnnnn 较大，n1ppGH LHLL HLHA0exp/IItLc温度/3535.135.235.33

4、5.435.535.635.735.835.936电压/V0.0550.0580.0630.0740.0880.1020.1190.1390.1530.1730.19836.136.236.336.436.536.636.736.836.9370.2140.2260.2380.2510.2630.2710.2780.2810.2840.287121122121222fffmmnhmnhmnh mA2/2/2.070.97mmmAmNmN/Ddd2sinmDnh2121/2/xx dCSCSddRxd R xCSCSx 则令d 横向相干线度bc 光源临界宽度cb 44pcbbtdR bb R 22222ctAdRb 221.220.611.222tcdA ctd Rbcb021 cosdII dkk00/20/20021 cossin221cos2kkkkIIkdkkIkkk0000sinsin2221cos21cos22MmkkII kkII kkkk2sinVc222/010 0/01/0VVVV 当一 定 时 增 大，下 降；当当 当且当22/ck /ccc 1/1cc 12EEE10111012022202coscosEEtk rEEtk r *2IEEEP点处光强：为两光束振动方向的夹角两波相位差折叠式衰荡光强测量反射率原理图