Lanthanum hexaboride for Q-switching and mode-locking applications

Omar, Suziana and Zulkipli, Nur Farhanah and Ahmed, Norizan and Jusoh, Zulzilawati and Musa, Baktiar and Apsari, Retna and Harun, Sulaiman Wadi (2022) Lanthanum hexaboride for Q-switching and mode-locking applications. Optics Communications, 502. ISSN 0030-4018, DOI

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In this paper, a new saturable absorber (SA) based on Lanthanum Hexaboride (LaB6) is used to produce Q -switched and mode-locked laser pulses. In constructing the SA, the prepared LaB6 powder is dispersed in polyvinyl alcohol (PVA) solution before the mixture is dried to form a thin film. A small piece of the film is placed between two fiber ferrules to form a LaB6 PVA SA and added to a laser cavity of an erbium-doped fiber laser (EDFL) to produce Q-switched and mode-locked pulses. The Q-switched laser operates at 1531 nm. The pulse width of the pulses can be varied between 4.32 to 2.46 ps with a corresponding repetition rate of 62.0 to 89.6 kHz when the pump power is increased from 45.4 to 97.6 mW. At the maximum output power of 4.31 mW, the highest pulse energy of 48.1 nJ was obtained. A passively mode locked EDFL was also successfully realized with LaB6 SA by adding 100 m long single mode fiber inside the cavity. A stable mode-locked laser operating at 1559.1 nm was achieved at the threshold pump power of 102.8 mW with a pulse rate of 1.88 MHz. The pulse energy of 5.6 nJ and output power of 10.54 mW were obtained at a maximum pump power of 144.6 mW. To the best of our knowledge, this is the first demonstration of utilizing LaB6 material as SA to produce pulses in the 1.5 pm region.

Item Type: Article
Funders: Airlangga University Re-search Grant [804/UN3.15/PT/2021], Universiti Malaya [IIRG005A-19IISS]
Uncontrolled Keywords: Q-switching; Innovation; Mode-locking; Lanthanum hexaboride; Technological capabilities
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Engineering > Department of Electrical Engineering
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 27 Apr 2022 03:08
Last Modified: 27 Apr 2022 03:08

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