Development of Q-Switcher fiber laser using Molybdenum Aluminium Boride (MoAlB) thin film as saturable absorber

Hazaha, Nur Diana Azwa (2021) Development of Q-Switcher fiber laser using Molybdenum Aluminium Boride (MoAlB) thin film as saturable absorber. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Fiber laser has been a prevalent topic for the past decade, attracting much technical attention with many benefits. They complement existing bulk lasers instability, simplicity, efficient heat dissipation, reliability and low maintenance. In recent years, Q-Switched fiber lasers have gained a lot of attention. They can create relatively high energy pulses, which are helpful in various applications such as remote sensing, laser range finding, communication, marking, micro-machining, biomedical imaging and medical surgery. Fiber laser can be operated in Q-switched or mode-locked regimes to emit short pulses and ultra-short pulses at repetition rates of kHz and MHz, respectively. The objectives of this project is to study the lasing characteristic of erbium-doped fiber, investigate the characteristic of MoAlB as a saturable absorber and demonstrate Q-switched EDF laser using MoAlB thin film as a saturable absorber in the 1.55µm region. The Q-switched fiber laser can be achieved using either passive or active technique. In this case, passive technique is the suitable technique that can be implement for this project because the use of saturable absorber (SA) for passive Q-switching simplifies cavity construction and eliminates the requirement for external Q-switching electronics. The laser cavity was constructed using Erbium-Doped Fiber Laser as the gain medium. The preliminary result of Q-switched pulses operating at 1550 nm can be readily generated when the 980 nm pump power is raised.

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