飞秒激光诱导稀土掺杂玻璃中非线性光学晶体的空间选择性沉淀。

Femtosecond laser induced space-selective precipitation of nonlinear optical crystals in rare-earth-doped glasses.

作者信息

Zhu Bin, Dai Ye, Ma Hongliang, Zhang Songmin, Lin Geng, Qiu Jianrong

机构信息

State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou 310027, China.

出版信息

Opt Express. 2007 May 14;15(10):6069-74. doi: 10.1364/oe.15.006069.

DOI:10.1364/oe.15.006069

PMID:19546911

Abstract

We report on space-selective precipitation of nonlinear optical crystals in an Er(3+)-doped BaO-TiO(2)-SiO(2) glass by using a focused femtosecond laser with 800 nm, 250 kHz and 150 fs. An intense green emission due to upconversion luminescence is observed around the focal point of the femtosecond laser beam at the initial stage of the laser irradiation. A blue emission due to second harmonic generation begins to emerge from the irradiation region after 40 s irradiation. Micro-Raman spectra indicate that nonlinear optical crystals (Ba(2)TiSi(2)O(8)) are precipitated after the laser irradiation. The irradiation time for crystallization in Er(3+)-doped BaO-TiO(2)-SiO(2) glasses is longer than that in BaO-TiO(2)-SiO(2) glasses under the same irradiation conditions. The mechanisms responsible for the observed phenomena are discussed.

摘要

我们报道了利用波长800 nm、频率250 kHz、脉宽150 fs的聚焦飞秒激光在掺铒BaO-TiO₂-SiO₂玻璃中实现非线性光学晶体的空间选择性沉淀。在激光辐照初始阶段，在飞秒激光束焦点周围观察到由于上转换发光产生的强烈绿色发射。辐照40 s后，由于二次谐波产生的蓝色发射开始从辐照区域出现。显微拉曼光谱表明，激光辐照后非线性光学晶体（Ba₂TiSi₂O₈）沉淀析出。在相同辐照条件下，掺铒BaO-TiO₂-SiO₂玻璃中结晶所需的辐照时间比BaO-TiO₂-SiO₂玻璃中的长。文中讨论了导致观察到的现象的机制。