Microstructural modification of LiNbO3 crystals induced by femtosecond laser irradiation
Microstructural modification of LiNbO3 crystals induced by femtosecond laser irradiation
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DOI：
10.1016/j.apsusc.2005.03.054
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发表时间：
2005-07
影响因子：
6.7
通讯作者：
P. Galinetto;D. Ballarini;D. Grando;G. Samoggia
中科院分区：
文献类型：
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作者：
P. Galinetto;D. Ballarini;D. Grando;G. Samoggia
通过飞秒激光照射铌酸锂（LN）晶体来诱导微观结构的改变，并通过光学显微镜和显微拉曼光谱进行研究。商用 z 切全等 LN 基板采用 810 nm 的聚焦超短激光脉冲进行照射，该脉冲由 Ti:Sapphire 振荡器或放大的 Ti:Sapphire 激光系统产生。在焦点区域，通过改变照射条件观察到折射率变化或材料去除。拉曼光谱显示照明区域中拉曼模式的叛乱，这在使用的散射几何结构中是被禁止的。随着接近烧蚀区域，这种现象逐渐增加，在烧蚀区域，钛宝石振荡器发出的低能量和高重复率脉冲会形成铌氧化物和缺锂表面。非晶表面是通过放大的钛宝石激光系统的高能量和低重复率脉冲获得的。
Microstructural modifications were induced by femtosecond laser irradiation on lithium niobate (LN) crystals and investigated by means of optical microscopy and micro-Raman spectroscopy. Commercial z-cut congruent LN substrates were irradiated with focused ultra-short laser pulses at 810nm, generated by a Ti:Sapphire oscillator or an amplified Ti:Sapphire laser system. At the focus region, either refractive index changes or material removal were observed by varying the irradiation conditions. The Raman spectrum shows in the illuminated regions the insurgence of Raman modes, which are forbidden in the used-scattering geometry. This phenomenon increases gradually by approaching the ablation region, where niobium oxides and Li-deficient surfaces are formed for the low energy and high repetition rate pulses from the Ti:Sapphire oscillator. Amorphous surfaces are obtained for high energy and low repetition rate pulses from the amplified Ti:Sapphire laser system.