郜向阳,李玉栋,孙骞,田建国.飞秒激光直写磁光玻璃波导研究[J].光电子激光,2015,26(5):925~931 |
飞秒激光直写磁光玻璃波导研究 |
Fabrication of magneto optical glass waveguides by femtosecond laser direct writing |
投稿时间:2015-01-14 |
DOI: |
中文关键词: 飞秒激光 磁光效应 波导 磁光玻璃 |
英文关键词:femtosecond laser magneto-optical effect waveguide magneto-optical glass |
基金项目:国家自然科学基金(61178004)和国家重点基础研究专项基金(2011CB922003)资助项目 (南开大学 物理科学学院,弱光非线性光子学教育部重点实验室,天津 300071) |
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中文摘要: |
用飞秒激光在硼铝硅酸盐类磁光玻璃中直写光波导 。对比了 飞秒激光在TG20和TG28两种Tb3+浓度不同的硼铝硅酸盐玻璃中的磁光波导的效果 ,并研究 了飞秒激光脉冲的能量和偏振对波导的模式以及Verdet常数的影响。实验结果表明,圆偏振 光具有更低的 阈值能量,且诱导的折射率增量高于同功率的线偏振光,首次在实验上证明飞秒直写加工硼 铝硅酸盐磁光 玻璃时,折射率的改变主要源于离子键的三或四光子吸收过程。磁光系数测量表明, 飞秒激光的功 率与偏振对TG28中波导Verdet常数的影响较弱,Verdet常数损失量小于体材料的15%,而在TG20中 却可以达到70%。实验结果表明,TG28比TG20更适用于飞秒激光加工 磁光微结构,即通过对 磁光玻璃中掺杂离子浓度的选择,可以实现高磁光系数、高折射率调制的光学微结构的制备 。 |
英文摘要: |
In this work,we investigate the waveguide fabrication and the mechan ism of femtosecond laser direct writing in borosilicate aluminum magneto-optical glass.We compare the charact eristics of the magneto-optical waveguides fabricated in two kinds of glasses with different concentrations of T b3+ ions,i.e.,TG20and TG28glasses, and systematically study the dependence of the guiding modes and Verdet consta nt of waveguides on femtosecond laser pulses′ polarization and energy.The results show that the c ircularly polarized femtosecond pulses have lower fabrication threshold energy and can introduce larger in crease in the refractive index change inside magneto-optical glass,compared with the linearly polarized pulses.It con f irms that the refractive index change in borosilicate aluminum glass mainly comes from the 3- or 4-photon absorption of ionic bonding.The magneto-optical coefficient measurement results prove that in TG28glass,the power and polarization state of the incident pulses have small influence on Verdet constant of waveguides.The decre ase in Verdet constant of magneto-optical waveguide is less than 15% of the value in bulk TG28glass,whe reas the decrease can reach 70% in TG20glass.Therefore,TG28glass is more appropriate to fabricat e magneto-optical microstructures by using femtosecond laser direct writing than TG20glass.By careful selectio n of the dopant concentration in the magneto-optical glass the opt ical microstructures with high magneto-optical coefficient and high refractive index modulation may be fabrica ted. |
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