Beam-size effect in time-delayed laser-induced double gratings

Xin Mi, Zuhe Yu, Qian Jiang +1 more

Qiliang Li, Xin Chen, Junfeng Song +3 more

Pavel A Apanasevich, Valentin A. Zaporozhchenko

Xin Mi, Zuhe Yu, Qian Jiang +2 more

We have employed chaotic and phase-diffusion models to study the effect of laser coherence on time-delayed laser-induced double gratings (TDLIDG). It is found that, although the temporal behavior of the four-wave mixing signal depends on the stochastic properties of the lasers and the relaxation time of the grating, the modulation of the signal is always damped out when the relative time delay between two pump beams is much longer than the laser coherence time. We performed a TDLIDG experiment mediated by thermal effects to study the temporal behavior of the modulation, and we obtained the frequency difference between two light beams with an accuracy limited by the laser linewidth. We also studied the influence of the phase change in the optical path on TDLIDG.

V. M. Kenkre

Panming Fu, Xin Mi, Zuhe Yu +2 more

We have studied theoretically a time-delayed laser-induced double gratings (TDLIDG) in a Doppler-broadened three-level system. We have shown that the overall accuracy of using TDLIDG for the energy-level splitting measurement is determined by the homogeneous linewidths of the optical transitions.