激光与光电子学进展, 2017, 54 (12): 120501, 网络出版: 2018-01-02
激光干涉光刻制备976 nm分布反馈式激光器光栅 下载: 754次
Fabrication of Gratings Used in 976 nm Distributed Feedback Lasers Based on Laser Interference Lithography
摘要
分布反馈式(DFB)半导体激光器具有优良的稳定性和单模性, 广泛应用于激光器抽运和光通信等领域。光栅作为DFB激光器的关键部件, 对激光器性能有重要的影响。针对976 nm波段设计制备了DFB激光器的光栅。基于耦合模理论优化设计光栅的结构参数, 采用激光干涉光刻和反应耦合等离子体(ICP)刻蚀技术制备光栅。通过引入表面镀膜SiO2的方法提高了光栅图形由光刻胶向衬底转移的保真度, 显著地改善了光栅的图形质量。探究了曝光时间、ICP刻蚀时间对光栅表面形貌的影响。实验结果表明, 所制备的光栅条纹分布均匀, 有较好的表面形貌, 满足预期设计目标。
Abstract
The distributed feedback (DFB) laser, featured in its stability and single-mode emission, is widely used in various domains such as pumping lasers and optical communications. As a key component in the DFB laser, the grating plays an important role in laser performance. The design and fabrication of the grating for the 976 nm DFB semiconductor laser are presented. The experiment starts with the optimization of the grating structure parameters based on the coupled mode theory. The gratings are fabricated through laser interference lithography and inductively coupled plasma (ICP) etching technique. The pattern quality of the fabricated grating is improved by the introduction of surface coating SiO2, and the fidelity of grating pattern transfer from photoresist to substrate is improved as well. Influence of exposure time and ICP etching time on grating surface morphology is investigated. The experiments show that the fabricated grating has uniformly distributed fringes and better surface morphology, and the expected design is realized.
白云峰, 范杰, 邹永刚, 王海珠, 海一娜, 田锟. 激光干涉光刻制备976 nm分布反馈式激光器光栅[J]. 激光与光电子学进展, 2017, 54(12): 120501. Bai Yunfeng, Fan Jie, Zou Yonggang, Wang Haizhu, Hai Yina, Tian Kun. Fabrication of Gratings Used in 976 nm Distributed Feedback Lasers Based on Laser Interference Lithography[J]. Laser & Optoelectronics Progress, 2017, 54(12): 120501.