Preparation of Bi₂Te₃ Based on Saturable Absorption System and Its Application in Fiber Lasers

Abstract

Fiber laser is a fundamental component of laser systems and is of great significance for the development of laser technology. Its pulse output can be divided into Q-switched and mode-locked. Achieving ultrashort pulse with narrower pulse duration and higher power is the focus of current research on mode-locked lasers. As an important component of fiber laser systems, saturable absorber (SA) can modulate losses in the optical cavity and generate pulses, enabling the laser system to achieve pulse output under long-term normal operating conditions better. Therefore, expanding the selection range of materials with better saturable absorption properties to improve the quality of pulse output is an important topic in current research. In this paper, the second generation topological insulator Bi2Te3 single crystal is prepared, and a ring fiber laser system is built with the Bi2Te3 SA. The mode-locked pulse with a pulse duration of 288 fs and a signal-to-noise ratio (SNR) of 80.202 dB is realized. This result verifies that Bi2Te3, as a member of topological insulator, has good saturable absorption characteristics, and has broad prospects for the application research in lasers.

Tunable Three-Wavelength Fiber Laser and Transient Switching between Three-Wavelength Soliton and Q-Switched Mode-Locked States

“…Ultrafast fiber lasers [1][2][3] have potential applications in optical communication, [4] optical sensing, [5] and nonlinear science. [6] Wavelength-tunable [7][8][9] fiber lasers and multiwavelength [10][11][12] fiber lasers, as the main types of ultrafast fiber lasers, are widely used due to their unique spectral characteristics.…”

Nonlinear Multimodal Interference as Ultrafast Photonic Device for Dual-Wavelength Domain-Wall Dark Pulse Generation

“…In addition to the aforementioned studies, nonlinear multimodal interference (NL-MMI) related saturable absorber behavior in GIMFs is theoretically proposed by Mafi et al [5] Subsequently, numerous experimental investigations on NL-MMI based mode-locked lasers have been performed in different dispersion regimes. [6][7][8][9][10][11][12][13][14] On the other hand, due to the multimodal interactions in GIMFs, the phase difference between excitation modes will undergo periodic changes, resulting in coherent mode superposition and stable fundamental transverse mode generation. [15] In the meantime, the mode with the largest relative intensity can be maximally coupled into the following single-mode fiber (SMF), thus realizing the mode selection between GIMF and SMF.…”