We present a reduced-phase triple-illumination interferometer (RPTII) as a novel single-shot technique to increase the precision of dualillumination optical phase unwrapping techniques. The technique employs two measurement ranges to record both low-precision unwrapped and highprecision wrapped phases. To unwrap the high-precision phase, a hierarchical optical phase unwrapping algorithm is used with the lowprecision unwrapped phase. The feasibility of this technique is demonstrated by measuring a stepped object with a height 2100 times greater than the wavelength of the source. The phase is reconstructed without applying any numerical unwrapping algorithms, and its noise level is decreased by a factor of ten.
All Science Journal Classification (ASJC) codes
- Atomic and Molecular Physics, and Optics