Mode-locked 2μm fiber laser with a multi-walled carbon nanotube as a saturable absorber

Azooz, Salam . M and F. Ahmad, F. Ahmad and Ahmad, Harith and Harun, Sulaiman . Wade. and Hamida, Belal Ahmed and Khan, Sheroz and A. Halder, A. Halder and M. C. Paul , M. C. Paul and M. Pal, M. Pal and S. K. Bhadra, S. K. Bhadra (2015) Mode-locked 2μm fiber laser with a multi-walled carbon nanotube as a saturable absorber. Chinese Optics Letters, 13 (3). 030602-1.

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Abstract

We propose and demonstrate a passively mode-locked fiber laser operating at 1951.8 nm using a commercial thulium-doped fiber (TDF) laser, a homemade double-clad thulium–ytterbium co-doped fiber (TYDF) as the gain media, and a multi-walled carbon nanotube (MWCNT) based saturable absorber (SA). We prepare the MWCNT composite by mixing a homogeneous solution of MWCNTs with a diluted polyvinyl alcohol (PVA) polymer solution and then drying it at room temperature to form a film. The film is placed between two fiber connectors as a SA before it is integrated into a laser ring cavity. The cavity consists of a 2 m long TDF pumped by a 800 nm laser diode and a 15 m long homemade TYDF pumped by a 905 nm multimode laser diode. A stable mode-locking pulse with a repetition rate of 34.6 MHz and a pulse width of 10.79 ps is obtained when the 905 nm multimode pump power reaches 1.8–2.2 W, while the single-mode 800 nm pump power is fixed at 141.5 mW at all times. To the best of our knowledge, this is the first reported mode-locked fiber laser using a MWCNT-based SA.

Item Type:	Article (Journal)
Additional Information:	7222/43490
Subjects:	Q Science > Q Science (General) Q Science > Q Science (General) > Q300 Cybernetics
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Medicine > Department of Community Health & Family Medicine
Depositing User:	Belal Ahmed Hamida
Date Deposited:	23 Jun 2015 08:07
Last Modified:	03 Nov 2017 08:25
URI:	http://irep.iium.edu.my/id/eprint/43490

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