An Investigative Approach: Enhancing Q-Switched Fibre Laser using Molybdenum Aluminium Boride (MoAlB) Thin Film as Saturable Absorber

Abstract

Over the past decade, fibre laser technology has garnered significant technological focus and benefits. They improve the instability, affordability of maintenance, efficient heat dissipation, simplicity, and reliability of existing bulk lasers. Q-Switched fibre lasers have recently garnered significant attention. They possess the capacity to generate pulses with considerable energy levels, making them valuable for a range of applications such as micro-machining, biomedical imaging, communication, remote sensing, laser range finding, and medical surgery. Fibre lasers may generate ultra-short pulses at repetition rates of millions and thousands of cycles per second by functioning in the mode-locked or Q-switched states. Molybdenum Aluminium Boride (MoAlB) is employed as a saturable absorber for investigating the lasing properties of erbium-doped fibre. Moreover, a Q-switched EDF laser is observed utilising a MoAlB thin film as a saturable absorber in the 1.55µm wavelength range. The Q-switched fibre laser can be realised using either a passive or active technology. In this investigation, the passive approach is a suitable technique because using a saturable absorber (SA) for passive Q-switching simplifies cavity construction and eliminates the demand for external Q-switching electronics. The laser cavity was built utilising Erbium-Doped Fibre Laser as the gain medium. Increasing the pump power to 980 nm allows it to get results of Q-switched pulses running at 1550 nm.