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

• Published in: Optical fiber technology Vol. 71; p. 102933
• 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: Journal Article
• Language: English
• Published: Elsevier Inc 01-07-2022
• Subjects: L-band; Mode-locked fiber laser; Noise-like pulse; Tapered optical fiber; Tungsten trioxide; Ultrashort pulse; RSA; TPA; EDFL; EDF; VOA; Tapered optical fiber; Noise-like pulse; OPM; L-band; SA; NLO; Ultrashort pulse; NLP; PC; GVD; OC; Mode-locked fiber laser; WO3; UFL; IPA; Tungsten trioxide; PDMS
• ISSN: 1068-5200; 1095-9912
• DOI: 10.1016/j.yofte.2022.102933

•L-band noise-like pulse employing WO3 nanoparticles as saturable absorber (SA)•Noise-like pulse generation with ∼ 10 nJ pulse energy and ∼ 19 nm bandwidth.•High power L-band operated WO3 saturable absorber in EDFL up to 3.5 W.•SA was fabricated using the common and scalable solution processing technique.
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.