In order to study the influence of dual-wavelength laser conditioning on the ultraviolet damage characteristics of DKDP crystals, 3 ω (355nm) and 1 ω (1064nm) lasers with different energy ratios were used in DKDP crystals laser conditioning simultaneously. In the case of single-wavelength laser conditioning, 3 ω lasers scan DKDP in raster scanning with increasing energy density lower than crystal damage threshold. In the case of dual-wavelength laser conditioning, the DKDP is irradiated by 3 ω and 1 ω at the same time with different fluence ratios. In the same DKDP region, 1 ω fluence is a constant and 3 ω fluence is varied. The damage characteristics of the samples under 3 ω irradiation (evaluated by damage probability curve and damage density) are obtained by 1-on-1 irradiation. The experimental results show that: (1) Compared with the 3 ω conditioning, the dual-wavelength laser conditioning can improve the damage resistance of DKDP crystals with ultraviolet damage significantly; (2) The best laser conditioning performance is obtained with the fluence of 1 ω equaling 8.8 J/cm2 in this paper, here the maximum 3 ω zero probability damage threshold of DKDP crystal is 29.6 J/cm2. (3) Under the simultaneous conditioning of dual-wavelength lasers, 1 ω , which fluence is far below the self-damage threshold, participates in the conditioning process, indicating that there is an energy coupling effect between wavelengths.
We propose a new method to discuss the evolution of physical systems, which has an analytic form. And we systematically introduce this new method by the example of Jaynes-Cummings model without rotation wave approximation. Simultaneously, while we repeat previous work by our method, we also calculate it by adding the time growth factor to the initial state unfolded in the steady state which is based on Fock state and is obtained by solving the time-independent Schrodinger equation (in this article, the traditional method refers to this method). By comparing these two results, we find the drawback of our method and improve it. Finally, we show that our improved method need the smaller Fock space than the traditional method for physical systems with two-mode cavity field and put forward expectations for the follow-up study.
We study the entanglement dynamics of T-C (Tavis-Cummings) model without rotating wave approximation. By using
displaced coherent state method, the influence of initial state and coupling strength to concurrence is numerically studied.
Our result demonstrates that the entanglement between two atoms always keep maximum when the initial state is antisymmetric
while the non-entangled initial state produce entanglement periodically due to the effect of non-rotating
terms. We also show that the coupling strength between the cavity field and atoms play a critical role in the entanglement
dynamics.
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