He – Ne laser light wavelength measurement by diffraction technique

Chanopat chonlakdao, Chomphon Khomcom, Saravut Mekurl, Sirinuch Chindaruksa


The purpose of this study was to apply the diffraction technique at a steel scale for He –
Ne laser light wavelength measurement. The average wavelength thus obtained comes out to be
λ = 644.6 nm. This compares well with the known wavelength of He – Ne laser to within 2 %.

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