Local amplification effect of two-photon absorption

J. Badziak, Adam Dubicki

Jiahua Li, Ai-Xi Chen, Ji-Bing Liu +1 more

This paper theoretically studies the effects of the vacuum-induced coherence on one- and two-photon absorption in a four-level atomic medium. It finds that the one- and two-photon absorption and amplification properties are quite sensitive to the vacuum-induced coherence. It is also shown that the one- and two-photon absorption spectra can be dramatically affected by modulating the relative phase of the applied fields. With the proper choice of the relative phase, the amplification without inversion for the probe field can be realized.

Stephen V. Kershaw

Anshou Zheng, Jiahua Li, Zhiming Zhan +1 more

We investigate the influence of the vacuum-induced coherence on one- and two-photon absorption of the transient process in a four-level Y-type atomic system. We find that the one- and two-photon transient absorption and amplification properties are quite sensitive to the vacuum-induced coherence. It is also shown that the one- and two-photon absorption spectra of the transient process can be dramatically affected by modulating the relative phase of the applied fields. By appropriately choosing the relative phase, the amplification of the probe field can be achieved.

Suhui Yang, Dong Wang, Xu-Zhen Guo +2 more

Vasily G. Arkhipkin, E N Minakova

The simple model is proposed for amplification of a probe optical radiation without population inversion and enhancement of refractive index at a point of vanishing absorption when a strong driving field is present at the adjacent two-photon transition. The conditions for observation of the effects have been determined.