Femtosecond time-resolved absorption processes in lithium niobate crystals
Femtosecond time-resolved absorption processes in lithium niobate crystals
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DOI：
10.1364/ol.30.001366
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发表时间：
2005-06-01
期刊：
影响因子：
3.6
通讯作者：
Psaltis, D
中科院分区：
文献类型：
--
作者：
Beyer, O;Maxein, D;Psaltis, D
由于双光子吸收，飞秒泵浦脉冲在钛酸锂中强烈衰减;相关的非线性系数β（p）的范围从λ（p）= 388 nm时的近似3.5 cm/GW到514 nm时的近似0.1 cm/GW。在共线泵浦-探测实验中，在双泵浦波长2 λ（p）= 776 nm处的探测透射率由两个不同的过程控制：涉及泵浦和探测光子的直接吸收过程（1.8，类似或等于0.9 cm/GW）导致明显的短持续时间透射率下降，而泵浦激发的电荷载流子的探测吸收导致长持续时间的平台。相干泵浦-探测相互作用是不重要的。热载流子弛豫发生在小于或类似于0.1 ps的时间尺度上。(c)2005年，美国光学学会。
Femtosecond pump pulses are strongly attenuated in lithium niobate owing to two-photon absorption; the relevant nonlinear coefficient beta(p) ranges from similar to 3.5 cm/GW for lambda(p) = 388 nm to similar to 0.1 cm/GW for 514 nm. In collinear pump-probe experiments the probe transmission at the double pump wavelength 2 lambda(p) = 776 nm is controlled by two different processes: A direct absorption process involving pump and probe photons (,8, similar or equal to 0.9 cm/GW) leads to a pronounced short-duration transmission dip, whereas the probe absorption by pump-excited charge carriers results in a long-duration plateau. Coherent pump-probe interactions are of no importance. Hot-carrier relaxation occurs on the time scale of less than or similar to 0.1 ps. (c) 2005 Optical Society of America.