High precision time jitter measurement for large multi-beam laser facility

The time jitter should be detected and controlled accurately for multi-beam laser facility. In this paper, a spectral interferometry method is used to measure the time jitter between beams of the typical large laser facility SG-Ⅲ prototype in the running state. The basic principle to measure the time jitter using spectral interferometry is investigated theoretically. Several key parameters for measurement accuracy are analyzed. Experimental results prove that the spectral interferometry method applied to beam time jitter measurement is effective.