Experimental studies on the macro-coherent amplification mechanism and two-photon paired super-radiance

本研究旨在通过实验证明宏观相干放大机制，这是一类类似于超辐射的新型相干合作现象，例如当这种放大机制作用于双光子去激发过程时，其速率预计会被放大。我们用绝热拉曼散射制备了氢气的振动激发态，观察到了双光子级联过程，发现随着初始相干性的增加，所观察到的过程的速率被放大，其放大因子与理论预期相符。从而确立了宏观相干放大机制的有效性。

The present research aims at proving experimentally the macro-coherent amplification mechanism that is a new class of coherent and cooperative phenomena similar to the super-radiance.When such an amplification mechanism works for a two-photon deexcitation process, for example, its rate is expected to be amplified. In our experiment, we prepared the vibrational excited states of hydrogen gas by adiabatic Raman scatterings, and observed the two photon cascade process.As a result we found that the rate of the observed process is amplified as the initial coherence increases and that its amplification factor agrees with the theoretical expectation. We have thus established the validity of macro-coherent amplification mechanism.