Azooz, S M and Ahmad, F and Ahmad, H and Harun, S W and Hamida, B A and Khan, S and Halder, A and Paul, Mukul Chandra and Pal, Mrinmoy and Bhadra, Shyamal Kumar (2015) Mode-locked 2 mu m fiber laser with a multi-walled carbon nanotube as a saturable absorber. Chinese Optics Letters, 13 (3). ISSN 1671-7694

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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
Subjects: Processing Science
Divisions: Fiber Optics and Photonics
Depositing User: Bidhan Chaudhuri
Date Deposited: 09 Dec 2015 11:33
Last Modified: 08 Feb 2017 10:13

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