Fig. 4.

Single-frame conventional camera image alongside corresponding homodyne intensity and phase images of an insect wing. Homodyne intensity and phase images show features of a transmissive object can be recovered by the system when they are not visible in a conventional camera image. Furthermore, access to the phase image gives information on the optical path difference caused by the object. Note the blue portions toward the lower right of the wing showing the phase discontinuity where the optical path difference exceeds one wavelength. The intensity of the signal beam illumination incident on the camera was calculated to be ∼​25 photons per pixel.