Fringe counting method for synthetic phase with frequency-modulated laser diodes

Onodera, Ribun; Sakuyama, Munechika; Ishii, Yukihiro
September 2007
Review of Scientific Instruments;Sep2007, Vol. 78 Issue 9, p093104
Academic Journal
Fringe counting method with laser diodes (LDs) for displacement measurement has been constructed. Two LDs are frequency modulated by mutually inverted sawtooth currents on an unbalanced two-beam interferometer. The mutually inverted sawtooth-current modulation of LDs produces interference fringe signals with opposite signs for respective wavelengths. The two fringe signals are fed to an electronic mixer to produce a synthetic fringe signal with a reduced sensitivity to the synthetic wavelength. Synthetic fringe pulses derived from the synthetic fringe signal make a fringe counting system possible for faster movement of the tested mirror.


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