Nano-tungsten trioxide saturable absorber for L-band noise-like pulse mode-locked fiber laser

• Main Authors: Abdul Hadi, M. A. W., Lau, K. Y., Mohd Yusoff, N., Zainol Abidin, N. H., Alresheedi, M. T., Abas, A. F., Goh, C. S., Mahdi, M. A.
• Format: Article
• Published: Academic Press 2022
• Online Access: http://psasir.upm.edu.my/id/eprint/102280/; https://www.sciencedirect.com/science/article/pii/S106852002200116X

We demonstrate the generation of noise-like pulse (NLP) in L-band erbium-doped fiber laser incorporating nano-tungsten trioxide and polydimethylsiloxane (WO3/PDMS) decorated onto a tapered fiber structure. A Raman pump unit with 3.5 W pump power was employed for a core-pumping scheme of 7 m long highly doped erbium-doped fiber. At the maximum pump power, the NLP lasing wavelength was at 1602 nm with a broad spectral bandwidth of 19.05 nm. The generated pulse was characterized to have 10.38 nJ energy and 19.66 mJ/cm2 output fluence. The measured NLP spike pulse width was 178.87 fs within 56.56 ps pedestal range. This work paves way for future development of generating NLP from nano-tungsten trioxide under extreme pump powers.