Laser patterning and characterization of optical active crystals in glasses
Laser patterning and characterization of optical active crystals in glasses
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DOI：
10.1016/j.jascer.2013.02.006
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发表时间：
2013-03
影响因子：
2.3
通讯作者：
T. Komatsu;T. Honma
中科院分区：
文献类型：
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作者：
T. Komatsu;T. Honma
本文报道了BaAlBO_3F_2和β-BaB_2O_4In等光学活性晶体的激光图案化的最新进展。在利用连续波激光如Yb：YVO4光纤激光器(波长：1080 nm)进行激光诱导结晶时，在激光照射区域产生了陡峭的温度梯度，并在玻璃表面形成了高度定向的晶线。图案化晶体的质量和取向由二次谐波强度的方位依赖关系、偏振的微拉曼散射光谱和透射电子显微镜观察来表征。利用大重叠的激光照射，形成高取向的二维平面晶体图案化。通过逐渐将激光焦点从表面移到玻璃纤维内部，玻璃纤维内部的晶体图案化也是可能的。具有理想形貌和高取向的晶体图案化的进展为光学有源器件的应用提供了很大的潜力。
This paper reports the recent progress in the laser patterning of optical active crystals such as BaAlBO3F2and β-BaB2O4in glasses. In the laser-induced crystallization using continuous-wave lasers such as Yb:YVO4fiber lasers (wavelength: 1080 nm), a steep temperature gradient is created in the laser-irradiated region, and highly oriented crystal lines are patterned at the glass surface. The quality and orientation of crystals patterned are characterized from the azimuthal dependence of second harmonic intensities, polarized micro-Raman scattering spectra, and transmission electron microscope observations. Two-dimensional planar crystals with high orientations are patterned by applying laser irradiations with large overlapping. The patterning of crystals in the inside of glass fibers is also possible by moving gradually laser focal point from the surface into the inside. The progress in the crystal patterning with desired morphologies and high orientations provides a high potential for optical active device applications.