Origin of refractive index change in photo-thermo-refractive glass
Origin of refractive index change in photo-thermo-refractive glass
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DOI：
10.1016/j.jnoncrysol.2019.119496
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发表时间：
2019-10
影响因子：
3.5
通讯作者：
S. Ivanov;V. Dubrovin;N. Nikonorov;M. Stolyarchuk;Alexander Ignatiev
中科院分区：
文献类型：
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作者：
S. Ivanov;V. Dubrovin;N. Nikonorov;M. Stolyarchuk;Alexander Ignatiev
光热诱导的PTR玻璃折射率变化的起源仍有一些不确定性。一方面，根据Nikonorov N. V.，假设这是由于氟化钠纳米晶体（n ~ 1.32）和玻璃（n ~ 1.49）的折射率的差异。后来格列博夫LB等人提出了另一种机制。他们假设分布在PTR玻璃基质中的Na和F转化为结晶NaF（化学变化）不是光热诱导的折射率变化的主要原因，并将其解释为NaF晶体周围的高残余应力。因此，目前的实验研究主要集中在揭示氟化物PTR玻璃折射率变化的原因。实验结果表明，残余应力对PTR玻璃的折射率变化没有可测量的影响，这与Maxwell-Garnet理论的估计是一致的。
There are still some uncertainties in the origin of photo-thermo-induced refractive index change in PTR glass. On one side, according to Nikonorov N.V. it is assumed to be due to difference of refractive indexes of sodium fluoride nanocrystals (n ~ 1.32) and glass (n ~ 1.49). Later Glebov L.B. et al. suggested another mechanism. They assumed that the transformation of Na and F distributed in PTR glass matrix into crystalline NaF (chemical changes) are not the main causes of photo- thermo-induced refractive index change and accounted it for high residual stresses around the NaF crystals. So present experimental research is focused on revealing of the refractive index change origin in fluoride PTR glass. It is shown experimentally that residual stresses have no measurable effect on the refractive index change in PTR glass, that is in agreement with the estimations made using the Maxwell-Garnet theory.