Based on the quantum feature and the quantum coherent principle of the entangled photon pairs produced with the spontaneous parametric down-conversion,a measurement method of the distant clock synchronization is studied.

Optical coherence tomography used of low coherence light source is a novel non-invasive technology that can be regarded as the combination of a number of existing techniques such as confocal、low coherence , optical heterodyne and tomography.

To allow access to the high resolution and large dynamic range in optical fiber sensor system applications,low coherence,broad band spectral sources are good choices.

Coherent Hole-burning is a new theory that combines the optical hole-burning and atomic coherence.

The results indicate that atomic coherence of the four-level atomic system will be abated when the laser field linewidth is build up and laser field linewidth inhibits electromagnetically induced absorption.

We show the control of optical bistability and multistability via the atomic coherence induced by the microwave field in the presence of the antirotating wave coupling.

The concrete structure of the interferometric detection system with the low-coherence source was presented,and the detection principle of the interferometric detection system was narrated.