It is shown that selective extraction of an image from multiple interferograms can be performed by electronic processing of interference beat signals. The frequencies of beat signals generated by ramping the laser-diode (LD) current are proportional to the optical path differences between the reference and the object arms in a LD interferometer. A beat signal with a frequency corresponding to an object-assigned interferometric arm can be extracted by electronic tuning. An interference pattern detected by a dissector camera is sampled in synchronism with the beat signal, which permits two-dimensional selective imaging.
© 1995 Optical Society of America
Original Manuscript: November 21, 1994
Published: April 1, 1995
Ribun Onodera and Yukihiro Ishii, "Selective imaging with a frequency-modulated laser-diode interferometer," Opt. Lett. 20, 761-763 (1995)