Holmium Oxide Film as a Saturable Absorber for 2 μm Q-Switched Fiber Laser

Rahman, Mohd Fauzi Ab and Rusdi, Muhammad Farid Mohd and Lokman, Muhammad Quisar and Mahyuddin, Mohamad Badrol Hisyam and Latiff, Anas Abdul and Rosol, Ahmad Haziq Aiman and Dimyati, Kaharudin and Harun, Sulaiman Wadi (2017) Holmium Oxide Film as a Saturable Absorber for 2 μm Q-Switched Fiber Laser. Chinese Physics Letters, 34 (5). 054201. ISSN 0256-307X

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Official URL: https://doi.org/10.1088/0256-307X/34/5/054201

Abstract

This work reports on the use of the holmium oxide (Ho2 O3) polymer film as a saturable absorber (SA) for generating stable Q-switching pulses operating in a 2-μm region in a thulium-doped fiber laser cavity. The SA is prepared by diluting a commercial Ho2 O3 powder and then mixing it with polyvinyl alcohol (PVA) solution to form a Ho2 O3 -PVA film. A tiny part of the film about 1 mm×1 mm in size is sandwiched between two fiber ferrules with the help of index matching gel. When incorporated in a laser cavity driven by a 1552-nm pump, stable Q-switching pulses are observed at 1955 nm within the pump power range of 363-491 mW. As the pump power increases within this range, the repetition rate rises from 26 kHz to 39 kHz, as the pulse width drops from 4.22 μs to 2.57 μs. The laser operates with a signal-to-noise ratio of 47 dB, and the maximum output power and the pulse energy obtained are 2.67 mW and 69 nJ, respectively. Our results successfully demonstrate that the Ho2 O3 film can be used as a passive SA to generate a 2-μm pulse laser.

Item Type: Article
Uncontrolled Keywords: Holmium Oxide Film; Saturable Absorber; Q-Switched Fiber Laser
Subjects: Q Science > QC Physics
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Engineering
Faculty of Science > Dept of Physics
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 08 Jan 2019 09:03
Last Modified: 08 Jan 2019 09:03
URI: http://eprints.um.edu.my/id/eprint/19933

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