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飞秒激光诱导折射率变化提供了一种灵活的三维光子器件制作方法。具有法拉第效应的磁旋光玻璃在集成光学中有广泛的应用前景。研究了1kHz重复频率的飞秒激光在磁旋光玻璃中刻写光波导的特征,测试了不同刻写参数下波导的导光模式,研究了写入速度和写入功率对波导折射率、模场直径的影响,给出了波导形成的写入窗口范围。实验结果表明,在采用10×显微物镜,写入速度40μm/s,写入功率3mW时,获得了980nm激光处模场直径为10μm,损耗为1.53dB/cm的波导,有利于实现波导和单模光纤之间的模式耦合,且波导区域费尔德系数只有轻微减小(约2.8%)。
Femtosecond laser-induced changes in refractive index provide a flexible method of making three-dimensional photonic devices. The magnetic rotating glass with Faraday effect has a wide range of applications in integrated optics. The characteristics of optical waveguides engraved in magneto-optic glass were studied. The light guide modes of waveguides under different writing parameters were studied. The effects of writing speed and writing power on the refractive index, mode field diameter The influence is given and the range of write windows formed by the waveguide is given. The experimental results show that the waveguide with the mode field diameter of 10 μm and the loss of 1.53 dB / cm at 980 nm laser is obtained when using a 10 × microscope with a write speed of 40 μm / s and a write power of 3 mW. Mode coupling between single-mode fibers, and only a slight decrease (about 2.8%) of the Filde coefficients in the waveguide region.