Zhang Haibin, Eaton Shane M, Li Jianzhao, Herman Peter R
Department of Electrical and Computer Engineering, University of Toronto, Toronto, Ontario, Canada.
Opt Lett. 2006 Dec 1;31(23):3495-7. doi: 10.1364/ol.31.003495.
Novel Bragg grating waveguide structures have been fabricated in bulk borosilicate glass through a type II photosensitivity mechanism driven by single femtosecond laser pulses. Low-loss single-mode waveguides and narrow-linewidth Bragg gratings were generated simultaneously by forming an array of refractive index voxels in a single laser scan. Laser pulse duration is shown to significantly affect the grating strength and waveguide loss. Bragg wavelengths, defined by the periodicity of laser-modified volumes, were fully controlled by the sample scan speed to provide resonances anywhere in the 1200-1620 nm telecommunication bands. Four linear Bragg filters with distinct resonant wavelengths are presented that define the first demonstration of laser writing of multiple-wavelength and cascaded Bragg grating waveguides in a single process step.
通过由单个飞秒激光脉冲驱动的II型光敏机制，在块状硼硅酸盐玻璃中制造了新型布拉格光栅波导结构。通过在单次激光扫描中形成折射率体素阵列，同时产生了低损耗单模波导和窄线宽布拉格光栅。结果表明，激光脉冲持续时间会显著影响光栅强度和波导损耗。由激光改性体积的周期性定义的布拉格波长，可通过样品扫描速度完全控制，以在1200 - 1620 nm电信波段的任何位置提供共振。展示了四个具有不同共振波长的线性布拉格滤波器，这首次证明了在单个工艺步骤中激光写入多波长和级联布拉格光栅波导。
