Wavelength measuring device and laser apparatus equipped with the device

摘要: A wavelength measuring device (2) comprises a standard light source (24) which emits of predetermined and means for introducing from to be measured into the (2). The further photosensor (20) sources is directed onto via Fabry-Perot etalon (17). Means (23,26,27) are provided correctng an error in on basis deviation fringe formed by expected fringe.