Vibrational Two-Photon Emission from Coherently Excited Solid Parahydrogen.
Vibrational Two-Photon Emission from Coherently Excited Solid Parahydrogen.
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DOI：
10.1021/acs.jpca.7b02011
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发表时间：
2016-12
期刊：
影响因子：
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通讯作者：
Y. Miyamoto;H. Hara;T. Masuda;N. Sasao;S. Uetake;A. Yoshimi;K. Yoshimura;M. Yoshimura
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文献类型：
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作者：
Y. Miyamoto;H. Hara;T. Masuda;N. Sasao;S. Uetake;A. Yoshimi;K. Yoshimura;M. Yoshimura
我们报道了固体准氢的相干激发振动态的双光子发射，这也是一种已知的量子固体。利用两个可见激光脉冲的受激拉曼散射制备了基态和激发态之间的相干性。双光子发射由另一个中红外激光脉冲触发。观察到，即使在激发后很长一段时间注入触发脉冲，双光子发射仍然存在。这是由于固体对氢的振动态的退相干时间长。研究发现，即使激发脉冲完全穿过靶材，发射强度仍在增加。这种相干发展在高目标温度和高残余正氢浓度下受到高度抑制。观察了靶材退火和激光损伤对靶材的影响。
We report the observation of two-photon emission from a coherently excited vibrational state of solid parahydrogen, which is also a known quantum solid. Coherence between the ground and the excited states is prepared by stimulated Raman scattering using two visible laser pulses. The two-photon emission is triggered by another mid-infrared laser pulse. It was observed that the two-photon emission persists even when the trigger pulse is injected long after the excitation. This is due to the long decoherence time of the vibrational states of solid parahydrogen. It is found that the emission intensity increases even after the excitation pulses pass through the target completely. This coherence development is highly suppressed at high target temperatures and high residual orthohydrogen concentrations. Effects of target annealing and laser-induced damage on the target are also observed.