Picosecond near-to-mid-infrared absorption of pulse-injected small polarons in magnesium doped lithium niobate
Picosecond near-to-mid-infrared absorption of pulse-injected small polarons in magnesium doped lithium niobate
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DOI：
10.1364/ome.8.001505
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发表时间：
2018-06-01
影响因子：
2.8
通讯作者：
Imlau, Mirco
中科院分区：
文献类型：
--
作者：
Freytag, Felix;Booker, Phillip;Imlau, Mirco
研究了LiNbO3:Mg中飞秒脉冲诱导（E-pump = 2.5 eV）皮秒红外吸收在0.30 eV ~ 1.05 eV之间的光谱区域。我们发现了一个非瞬时的中红外吸收峰，在时域高达1ps，以及一个宽带，长寿命的吸收峰（最大在0.85 eV，宽度接近0.5 eV），为1ps。通过考虑沿序列的小Nb-Nb（4+）电子极化子形成，建模成功：(i) nb -o -八面体中热电子-空穴对的双光子注入，（ii）电子-声子散射的解离和电子冷却，以及（iii）强电子-声子耦合的电子自定位。(C) 2018年美国光学学会根据OSA开放获取出版协议的条款
Femtosecond-pulse-induced (E-pump = 2.5 eV) picosecond infrared absorption is studied in the spectral region between 0.30 eV and 1.05 eV in LiNbO3:Mg. We find a non-instantaneous mid-infrared absorption peak in the time domain up to 1 ps and a broad-band, long-lived absorption (maximum at 0.85 eV, width approximate to 0.5 eV), for t > 1 ps. The modelling succeeds by considering small Nb-Nb(4+) electron polaron formation along the sequence: (i) two-photon injection of hot electron-hole pairs at Nb-O-octahedra, (ii) dissociation and electron cooling by electron-phonon-scattering, and (iii) electron self-localization by strong electron-phonon-coupling. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement