Investigation of mode characteristics in rectangular microresonators for wide and continuous wavelength tuning

• Published in: Frontiers of Optoelectronics (Online) Vol. 9; no. 3; pp. 412 - 419
• Main Authors: Tang, Mingying, Sui, Shaoshuai, Yang, Yuede, Xiao, Jinlong, Du, Yun, Huang, Yongzhen
• Format: Journal Article
• Language: English
• Published: Beijing Higher Education Press 01.09.2016; Springer Nature B.V
• Subjects: Aspect ratio; Biomedical Engineering and Bioengineering; Electrical Engineering; Engineering; Physics; Q factors; Research Article; Single mode operation; Tunable lasers; Tuning; Waveguides; 可调谐激光器; 宽波长; 微腔激光器; 微谐振器; 模式特性; 矩形腔; 输出波导; 连续可调谐; rectangular microresonator; semiconductor laser; tunable laser
• ISSN: 2095-2759; 2095-2767
• DOI: 10.1007/s12200-016-0580-9

The mode characteristics are investigated for the rectangular microresonators with an output waveguide connected to the midpoint of the long side for wide and continuous wavelength tuning. Through adjusting the aspect ratio of the rectangular microresonator, the mode Q factors can be greatly enhanced. Furthermore, the large mode interval between the high-Q modes makes the rectangular microresonators suitable for tunable lasers. As a special case, single-mode operation is achieved with a continuous tuning range of 9.1 nm for a square microlaser with the side length of 17.8 μm and the output waveguide width of 1.8 μm.