Mode-locked thulium-holmium doped fiber laser using Bi2Se3 saturable absorber deposited onto arc-shaped and side polished fibers via airbrush spraying technique

• Main Authors: Ahmad, Harith, Rusni, N A M, Samion, M Z, Yusoff, N, Zaini, M K A, Thambiratnam, Kavintheran, Ismail, M F
• Format: Article
• Language: English; English; English
• Published: Institute of Physics 2024
• Subjects: QC Physics
• Online Access: http://irep.iium.edu.my/116955/7/116955_Mode-locked%20thulium-holmium%20doped%20fiber%20laser.pdf; http://irep.iium.edu.my/116955/8/116955_Mode-locked%20thulium-holmium%20doped%20fiber%20laser_Scopus.pdf; http://irep.iium.edu.my/116955/9/116955_Mode-locked%20thulium-holmium%20doped%20fiber%20laser_WoS.pdf; http://irep.iium.edu.my/116955/; https://iopscience.iop.org/article/10.1088/2053-1591/ad9814

In this paper, the mode-locking performance using bismuth selenide (Bi2Se3) as a saturable absorber in a thulium-holmium-doped fiber laser (THDFL) was demonstrated for the first time. The saturable absorber (SA) was coated using an airbrush spraying technique onto two different hosts, arc-shaped and side-polished fibers. The airbrush was used to provide an even and uniform coating onto these two hosts. The generated mode-locked pulses of the arc-shaped fiber have a center wavelength of 1913.5 nm and a 3-dB bandwidth of 3.11 nm. The optical output has a repetition frequency of 13.9 MHz and an optical pulse width of 1.33 ps. In the case of the side-polished fiber, it has a center wavelength of 1918.55nmand a 3-dB bandwidth of 2.60 nm. The output pulse has a repetition frequency of 12.16MHzand an optical pulse width of 1.43 ps. This demonstration indicates that the arc-shaped fiber host has a better performance in terms of shorter pulse width, which is essential for a 2 μmlaser in tissue ablation procedures for medical applications.