A Novel Repetition Rate Adjustable SBS-Based Q-Switched Fiber Laser

Abstract

We experimentally demonstrated a novel repetition rate adjustable SBS-based Q-switched fiber laser. An inserted Fabry-Perot interferometer formed by two non-contact end faces of two FC/PC fiber connectors was inserted to help the system stabilize the random output of SBS-based Q-switching. By mechanically fine-tuning the length of the inserted Fabry-Perot interferometer, a linear and continuous repetition rate adjustment under a fixed pump power was achieved. This method paves a new way for the indirect control of repetition rate in SBS-based Q-switched fiber lasers. It is also found out that higher pump power allows wider adjustment range. At 600 mW pumping which is highest pump power of the source, the repetition rate almost tripled from 11.22 kHz to 32.06 kHz only by varying the length of FP cavity in less than 3 µm. In the meantime, the variation of pulse width, output power and single pulse energy were recorded and analyzed under different fixed pump powers. Although the adjusting range of repetition rate is not very wide but the tuning of repetition rate due to such a small length changing is unique and valuable. This original repetition rate control technique has great potential in areas like environment sensing and material detections.

Few-Layer Bismuthene for Coexistence of Harmonic and Dual Wavelength in a Mode-Locked Fiber Laser

“…These properties demonstrate that bismuthene has potential application for spintronics, designing and fabricating room-temperature nondissipative quantum computing devices, ultrafast pulse lasers, and so on. ,− Ultrashort pulse fiber lasers have also garnered tremendous interest from the researchers because of the compact design structure, low cost, high-efficiency of heat dissipation, and convenient operation. It has been widely applied to many field including materials microprocessing, medicine surgery, and optical fiber telecommunication systems. − Huge numbers of materials, such as semiconductor saturable absorber mirrors, graphene, topological insulators, black phosphorus, transition metal dichalcogenides, noble metal nano materials, transition metal chalcogenides, and so on, have been reported to be applied to the generation of ultrashort pulse laser because of its saturable absorption. − In addition, broadband, GHz high repetition rate, tunable, and switchable multiwavelength ultrafast fiber lasers also attract further attention because of its potential application in many fields. − Moreover, few-layer bismuthene also can be used in the field of ultrafast photonics and nonlinear optics to achieve ultrashort pulse laser. In 2018, Lu et al reported an ultrafast fiber laser with 652-fs optical pulse duration at a center wavelength of 1559.18 nm .…”