Zhou Puxi, Niu Lianze, Hayat Anwer, Cao Fengzhao, Zhai Tianrui, Zhang Xinping
Department of Electrical Engineering and Computer Science, Samueli School of Engineering, University of California Irvine, Irvine, CA 92697, USA.
Institute of Information Photonics Technology and College of Applied Sciences, Beijing University of Technology, Beijing 100124, China.
Polymers (Basel). 2019 Feb 3;11(2):258. doi: 10.3390/polym11020258.
In this study, high-order distributed-feedback (DFB) polymer lasers were comparatively investigated. Their performance relies on multiple lasing directions and their advantages include their high manufacturing tolerances due to the large grating periods. Nine laser cavities were fabricated by spin-coating the gain polymer films onto a grating structure, which was manufactured via interference lithography that operated at the 2, 3, and 4 DFB orders. Low threshold lasing and high slope efficiency were achieved in high-order DFB polymer lasers due to the large grating groove depth and the large gain layer thickness. A high-order DFB configuration shows possible advantages, including the ability to control the lasing direction and to achieve multiple-wavelength lasers. Furthermore, our investigation demonstrates that the increase in threshold and decrease in slope efficiency with an increase in the feedback order can be limited by controlling the structural parameters.
在本研究中，对高阶分布反馈（DFB）聚合物激光器进行了对比研究。它们的性能依赖于多个激射方向，其优点包括由于光栅周期大而具有高制造容差。通过将增益聚合物薄膜旋涂到光栅结构上制备了九个激光腔，该光栅结构是通过在二阶、三阶和四阶DFB级次下工作的干涉光刻制造的。由于光栅槽深大且增益层厚度大，高阶DFB聚合物激光器实现了低阈值激射和高斜率效率。高阶DFB结构显示出可能的优势，包括能够控制激射方向和实现多波长激光器。此外，我们的研究表明，通过控制结构参数，可以限制随着反馈级次增加而导致的阈值增加和斜率效率降低。
