Bi2Te3 Topological Insulator for Domain-Wall Dark Pulse Generation from Thulium-Doped Fiber Laser

Abstract

We have experimentally demonstrated domain-wall (DW) dark pulses from a thulium-doped fiber laser incorporating a topological insulator saturable absorber (SA). The bulk-structured Bi2Te3 was used as the SA, which was constructed on a fiber ferrule platform through the deposition of the Bi2Te3 mixed with distilled water. The DW dark pulses were generated from the thulium-doped fiber laser cavity with a dual wavelength at 1956 nm and 1958 nm. The dark pulse width and the repetition rate were measured as ~10.3 ns and ~20.7 MHz over the pump power of ~80 mW, respectively. To the best of our knowledge, this work is the first demonstrated generation of the DW dark pulse from a thulium-doped fiber laser using nanomaterial-based SA.

Molybdenum gallium carbide coated D-shape fiber for nanosecond dark pulse generation in erbium-doped fiber laser

“…Additionally, a study demonstrated the generation of a portable nanosecond laser with exceptional stability, showcasing a relative standard deviation of the pulse energy of less than 0.2% [41]. Furthermore, insights into the diverse approaches for achieving stable dark pulse generation are provided through investigations conducted on various materials, including topological insulators [42], carbon nanotubes [12], and plasmonic metamaterials [43]. Therefore, the signal-to-noise ratio is quite comparable to this work.…”

Effect of Sr Doping on Structural and Transport Properties of Bi2Te3

“…Bismuth chalcogenides as topological insulators (TI) and narrow gap semiconductors represent a vast playground for novel physics and applications in the fields of thermoectricity [1], spintronics [2], unusual superconductivity [3], photodetectors [4], optical coatings [5] etc. Possible existence of Majorana fermions [6,7] and potential use in faulttolerant quantum computing [8] draw a great interest in topological superconductors (TSC) [9].…”