Phys.org July 10, 2023
It is possible to observe interference between independent light sources by measuring correlations in their intensities rather than their amplitudes. An international team of researchers (Canada, UK) applied this concept of intensity interferometry to holography. They combined a signal beam with a reference and measured their intensity cross-correlations using a time-tagging single-photon camera. The correlations revealed an interference pattern from which they reconstructed the signal wavefront in both intensity and phase. They demonstrated the principle with classical and quantum light, including a single photon. Since the signal and reference do not need to be phase-stable nor from the same light source, this technique could be used to generate holograms of self-luminous or remote objects using a local reference. Their work has enabled the recording and reconstruction of faint light beams containing a single particle of light and opens the door to holographic imaging of remote objects… read more. Open Access TECHNICAL ARTICLEÂ
Experimental setup. Credit: SCIENCE ADVANCES, 5 Jul 2023, Vol 9, Issue 27