Measuring optical phase difference (devices or arrangements for controlling the phase of light beams G02F1/01); Determining degree of coherence; Measuring optical wavelength (spectrometry G01J3/00)

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• G01J 2009/002
• G01J 2009/004
• G01J 2009/006
• G01J 9/02 by interferometric methods (using interferometers for measuring optically the linear dimensions of objects G01B9/02)
• G01J 9/04 by beating two waves of a same source but of different frequency and measuring the phase shift of the lower frequency obtained