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首页> 外文期刊>Journal of nonlinear optical physics & materials >Experimental investigation of the photochromic effect and two-color holographic recording in near-stoichiometric LiNbO_3:Fe:Mn crystals
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Experimental investigation of the photochromic effect and two-color holographic recording in near-stoichiometric LiNbO_3:Fe:Mn crystals

机译：化学计量比接近LiNbO_3：Fe：Mn晶体的光致变色效应和双色全息记录的实验研究

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摘要

Near-stoichiometric LiNbO_3:Fe:Mn crystals are grown, then annealed in the oxygen atmosphere at 900°C for 6, 10 and 18 h. The photochromic effect of samples are investigated by measuring UV/VIS/NIR spectra before and after illumination of sensitizing light of 405 nm, and the dynamic characteristics were evaluated by use of the pump-probe method. Both the saturated absorption change and the photochromic speed increase with increases in the sensitizing intensity and the Fe concentration. In the two-color recording experiment, the holographic gratings were recorded by a red light of 633 nm, simultaneously sensitized by a violet light of 405 nm. The results show that the saturated diffraction efficiency increases with an increase in the ratio of recording light to sensitizing beam intensities, however, the sensitivity decreases. Higher concentration of Fe enables higher diffraction efficiency and higher sensitivity. In our investigation, the photochromic effect, and the two-color recording properties have little dependence on the oxidation time in the oxygen atmosphere when the oxidation time is longer than 6 h. An optimization may be obtained by further modifying these conditions appropriately.
机译：生长接近化学计量的LiNbO_3：Fe：Mn晶体，然后在氧气气氛中于900°C退火6、10和18 h。样品的光致变色效应通过在照射405 nm增感光之前和之后测量UV / VIS / NIR光谱进行研究，并使用泵浦探针法评估其动态特性。随着敏化强度和Fe浓度的增加，饱和吸收变化和光致变色速度都增加。在双色记录实验中，全息光栅由633 nm的红光记录，同时由405 nm的紫光敏化。结果表明，饱和衍射效率随着记录光与敏化光束强度之比的增加而增加，但是，灵敏度降低。 Fe的浓度越高，衍射效率越高，灵敏度也越高。在我们的研究中，当氧化时间长于6 h时，光致变色效应和双色记录特性几乎不依赖于氧气氛中的氧化时间。可以通过适当地进一步修改这些条件来获得优化。

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