We propose a single-shot phase-unwrapping method using two wavelengths in parallel phase-shifting digital holography (PPSDH). The proposed method enables one to solve the phase ambiguity problem in PPSDH. We conducted an experiment of the proposed method using two lasers whose wavelengths are 473 and 532 nm. An object having about 1.9 μm step, which is 7.1 times larger than the half wavelength of one of the lasers (266 nm), was fabricated by using vapor deposition of aluminum. Single-shot measurement of the height of the object was successfully demonstrated, and the validity of the proposed method was verified.
© 2014 Optical Society of America
Original Manuscript: January 7, 2014
Revised Manuscript: March 13, 2014
Manuscript Accepted: March 13, 2014
Published: April 9, 2014
Yonghee Lee, Yasunori Ito, Tatsuki Tahara, Junichi Inoue, Peng Xia, Yasuhiro Awatsuji, Kenzo Nishio, Shogo Ura, and Osamu Matoba, "Single-shot dual-wavelength phase unwrapping in parallel phase-shifting digital holography," Opt. Lett. 39, 2374-2377 (2014)