| 摘要 |
The present application relates to an optical length measuring apparatus using a laser beam, and has a proposition to enable highly accurate measuring. There includes a length measuring section measuring a distance to a subject and having a measuring laser beam source, a calibration laser beam source emitting a laser beam having a wavelength stability higher than that of a laser beam of the measuring laser beam source, an interference optical system bringing the laser beam of the measuring laser beam source and the laser beam of the calibration laser beam source into interference, and an arithmetic processing section performing a calculation of the distance based on an output of the interference optical system and an output of the length measuring section.
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