H. Ahmad, K. Kamaruzzaman, M.Z. Samion
This work demonstrates mode-locking and Q-switching in a holmium-doped fiber laser (HDFL) using topological insulator (TI) antimony telluride (Sb2Te3) as the saturable absorber (SA). The TI was drop-casted on an arc-shaped fiber to generate mode-locked pulses and used in thin-film form to generate Q-switched pulses. The mode-locked pulses obtained were centered at 2081.1 nm with a repetition rate of 13.4 MHz, signal-to-noise ratio of 42 dB, and 1.85 ps pulse width. The Q-switched pulses were generated at the center wavelength of 2086.3 nm within the pump power of 1.55 W until 1.80 W. Within this range, the repetition rate peaked at 50.76 kHz and the pulse width dropped to a minimum value of 2.64μs. To the best of the author's knowledge, this is the first work to use a topological insulator in an HDFL to generate both mode-locked and Q-switched pulses. © 1965-2012 IEEE.
Universiti Malaya, Photonics Research Centre, Kuala Lumpur, 50603, Malaysia; Universiti Kuala Lumpur British Malaysian Institute (UniKL BMI), Selangor, 53100, Malaysia; Universitas Negeri Malang, Faculty of Mathematics and Natural Sciences, Department of Physics, Malang, 65145, Indonesia
