Polarization analysis of the object wave using FMCW-digital holography

Frequency-Modulated Continuous-Wave (FMCW) technique has been introduced into digital holography (DH) using an injection-current-induced frequency modulation of a laser diode (LD) as a light source. Since the frequency of beat signals observed in the intensity variation of holograms captured by a high speed camera depends on the optical path length difference between the reference and the object light waves, the use of FMCW technique in DH can achieve selective reconstruction of an object located at a desired distance. As a preliminary consideration, both experimental and calculational studies were conducted for selective reconstruction of two objects at different positions. In addition, a polarization state of object wave transmitting through a PMMA sample was investigated using the technique in which the object wave interfered with two orthogonally linearly polarized reference waves having the different optical path lengths.