Induced heating by nonlinear absorption in LiNbO3-type crystals under continuous-wave laser irradiation

Induced heating by nonlinear absorption in LiNbO3-type crystals under continuous-wave laser irradiation
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连续波激光照射下 LiNbO3 型晶体非线性吸收诱导加热

DOI:
10.1016/j.optmat.2014.11.029
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发表时间:
2015
期刊:
影响因子:
3.9
通讯作者:
Norikatsu Mio
Norikatsu Mio
中科院分区:
材料科学3区
文献类型:
--
作者:
Susumu Kato;Sunao Kurimura;Hwan Hong Lim;Norikatsu Mio

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研究了连续波激光辐照下LiNbO 3型晶体的非线性吸收光致加热。热源是由双光子吸收产生的长寿命激发态的单光子吸收。作为光吸收体的激发态的累积效应对于连续激光器是重要的。光致加热导致灾难性的连续波激光击穿铌酸锂型晶体中的带隙能量小于光子能量的两倍,其中长寿命的激发态,如极化子,可以存在。对于铌酸锂,灾难性击穿的阈值强度估计为MW/cm 2的顺序。
We investigate light-induced heating by nonlinear absorption in LiNbO3-type crystals under continuous-wave (CW) laser irradiation. The heat source is one-photon absorption by long-lived excited states created by two-photon absorption. The accumulated effect of excited states, which act as light absorbers, is significant for a CW laser. Light-induced heating causes catastrophic CW laser breakdown in LiNbO3-type crystals in which the band-gap energy is less than twice the photon energy and in which long-lived excited states, like polarons, can exist. For LiNbO3, the threshold intensity for catastrophic breakdown is estimated to be in the order of MW/cm2.
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