Titanium dioxide doped fiber as a new saturable absorber for generating mode-locked erbium doped fiber laser

Reddy, Pinninty Harshavardhan and Rahman, Muhammad Fauzi Ab and Paul, Mukul Chandra and Latiff, Anas Abdul and Rosol, Ahmad Haziq Aiman and Das, Shyamal and Dhar, Anirban and Bhadra, Shyamal Kumar and Dimyati, Kaharudin and Harun, Sulaiman Wadi (2018) Titanium dioxide doped fiber as a new saturable absorber for generating mode-locked erbium doped fiber laser. Optik, 158. pp. 1327-1333. ISSN 0030-4026

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Official URL: https://doi.org/10.1016/j.ijleo.2018.01.032

Abstract

This work reports on the use titanium dioxide doped fiber (TiO2DF) as a passive saturable absorber (SA) in generating stable and self-starting mode-locked pulse laser in Erbium doped fiber laser (EDFL) ring cavity. The TiO2DF SA is a self-made fiber with 20 cm in length. It has a core diameter of 45 μm, the numerical aperture (NA) of 0.21, core composition of Silica-Titanium (Si-Ti) and cladding composition of Silica Oxides (SiO2). The TiO2DF SA has a wide-band linear absorption profile which also covers the mode-locked laser operating wavelength of 1553 nm. The TiO2DF serves as a great SA due to the presence of anatase crystalline form of TiO2 which provide saturable optical losses in the laser cavity. Results show that reliable mode-locked pulse is observed as the pump power raises from 106 mW to 142 mW. Within this range of pump power, a nearly constant repetition rate within the range of 0.984 MHz to 0.990 MHz is obtained. The actual pulse width seen from the autocorrelator is about 9.74 ps. Both, the maximum peak power of 878 mW and the maximum pulse energy of 8.56 nJ are calculated at the maximum pump power (142 mW). The fundamental frequency of the EDFL mode-locked pulse laser has a signal to noise ratio (SNR) of 54 dB. Our demonstration shows that the TiO2DF-SA is reliable and quite promising in generating EDFL mode-locked pulse laser.

Item Type: Article
Uncontrolled Keywords: Fiber laser; Mode-locking technique; Fiber saturable absorber
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Engineering
Deputy Vice Chancellor (Research & Innovation) Office > Photonics Research Centre
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 15 Apr 2019 08:02
Last Modified: 15 Apr 2019 08:02
URI: http://eprints.um.edu.my/id/eprint/20900

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