Q-switch erbium doped fiber laser using organic saturable absorber

Azme, Mohamad Al-Ameen (2024) Q-switch erbium doped fiber laser using organic saturable absorber. Project Report. Melaka, Malaysia, Universiti Teknikal Malaysia Melaka. (Submitted)

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Abstract

Over the past decade, fiber 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 fiber 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. Fiber lasers may generate ultra-short pulses at repetition rates of millions and thousands of cycles per second, respectively, by functioning Q-switched states. This thesis proposed and demonstrated novel SA devices based on organic material which is Clam shell (CaCO3) and for developing Q-switched fiber lasers operating 1.5 µm regions. New passive SAs based on Calcium Carbonate (CaCO3) have been successfully characterized in this work. CaCO3 materials were embedded into polyvinyl alcohol (PVA) to compose a film absorber, which was then sandwiched between two fiber ferrule connectors with a fiber adapter to form a fiber compatible SA. The Q-switched fiber lasers have been successfully demonstrated in 1.5-micron regimes by using the newly developed SAs. For instance, a Q-switched EDFL operating at 1568.64 nm of wavelength was demonstrated using the CaCO3 SA. The laser generates a stable pulses train with a pump power range from 140mW to 170 mW with the maximum repetition rate 34kHz, the shortest pulse width of 14.3 μs and the highest pulse energy of 0.88021 nJ.

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