Author Affiliations
Abstract
1 Center for Optics Research and Engineering, Key Laboratory of Laser & Infrared System, Ministry of Education, Shandong University, Qingdao 266237, China
2 School of Information Science and Engineering, Shandong Provincial Key Laboratory of Laser Technology and Application, Shandong University, Qingdao 266237, China
Based on the Nd-doped single-mode fiber as the gain medium, an all-fiber 12th harmonic mode-locked (HML) laser operating at the 0.9 µm waveband was obtained for the first time, to the best of our knowledge. A mandrel with a diameter of 10 mm was employed to introduce bending losses to suppress mode competition at 1.06 µm, which resulted in a suppression ratio of up to 54 dB. The 1st–12th order HML pulses with the tunable repetition rate of 494.62 kHz–5.94 MHz were obtained in the mode-locked laser with a center wavelength of . In addition, the laser has an extremely low threshold pump power of 88 mW. To the best of our knowledge, this is the first time that an HML pulse has been achieved in a 0.9 µm Nd-doped single-mode all-fiber mode-locked laser with the advantages of low cost, simple structure, and compactness, which could be an ideal light source for two-photon microscopy.
Nd-doped fiber laser harmonic mode-locking bending loss nonlinear polarization rotation low repetition rate Chinese Optics Letters
2023, 21(1): 011405
山东理工大学 物理与光电工程学院, 山东 淄博 255000
磁场的传感测量在相关领域具有重要应用。利用磁流体的磁光效应, 提出了一种基于光学Tamm态的磁场传感结构。该结构由加载了金属层和电介质层的一维磁流体光子晶体构成。数值研究了该结构的结构参数对传感性能的影响。结果表明, 磁流体层越厚, 探测灵敏度就越高。金属层和电介质层的厚度均存在一个最佳值, 使得传感器具有较高的探测精度。结果还表明, 该传感结构的探测灵敏度优于已报道的采用光子晶体缺陷结构实现的磁场传感器。研究结果为基于光学Tamm态的磁流体磁场传感器的设计制备提供了参考。
光学塔姆态 磁流体 磁场传感 传输矩阵法 optical Tamm state magnetic fluid magnetic field sensors transfer matrix method
山东理工大学物理与光电工程学院, 山东 淄博 255000
单层石墨烯的吸收率非常低,从而一定程度上限制了其在光电子学领域的应用。基于石墨烯的磁光效应,提出利用磁光光子晶体来增强石墨烯吸收率的方案。利用4×4传输矩阵法研究了相关物理参数对石墨烯吸收率的影响。结果表明:通过调节外加磁场可以有效增强石墨烯的吸收率,石墨烯的吸收特性表现出一定的磁圆二色性;调节外加磁场的磁感应强度和费米能量,可使石墨烯对左旋圆偏振光和右旋圆偏振光均具有较高的吸收率,在一定条件下可实现近完美吸收。研究结果为基于石墨烯的高性能磁圆二色性传感器、光吸收器和光电探测器等新型光电子器件的设计及制作提供了理论依据。
薄膜 石墨烯 磁光光子晶体 吸收器 传输矩阵法
