(1) Cov kev tsis txaus ntseeg ntawm monochromaticity
Cov kab hluav taws xob nyob hauv kab teeb ci tag nrho cov xim;
Cov teeb pom kev zoo (xws li lub teeb los ntawm cov roj fluorescent leeg) feem ntau dawb hauv kev sib xyaw ntawm lub teeb ci ntawm ob peb xim.
(2) Lub hauv ntej ntawm kev taw qhia
Lub laser emits ib tug nqaj nrog siab ncaj, uas yog, sib xyaw lub teeb yoj tawm mus rau hauv ib txoj kab ncaj nraim tsis kis;
Tiaj hluav taws xob los ntawm cov teeb pom kev zoo tib yam yuav kis thoob txhua qhov chaw.
(3) Muaj kev sib txuam.
Thaum pom lub teeb hluav taws xob hauv cov kab hluav taws xob tau nthuav tawm, lawv oscillate nrog cov synchronized crests tag nrho thiab sab nraud. Qhov no tej khoom vaj tse yog hu ua coherence. Thaum ob lub laser beams sib tshooj sib, cov peaks thiab troughs ntawm txhua nqaj yuav tsuas yog txhawb nqa ib leeg, ua ib qho interferogram.