Analyses and fabricate saturable absorber film for q-switched fiber laser application

Nallathabi, Ugentheeren (2023) Analyses and fabricate saturable absorber film for q-switched fiber laser application. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

In his work, the feasibility of employing graphene oxide as a saturable absorber (SA) to passive generate pluses in Q-switched at C-bands is investigated. Passive Qswitched lasers were previously manufactured utilizing semi-conductor saturable absorber mirrors with nonlinear polarization rotation. (NPR) (SESAMs). Recent research has shown that 2D materials like single-walled carbon nanotubes may also be used to create passive Q-switched lasers (SWCNT). At C-band areas, the performance of graphene saturable absorbers will be explored. A thin coating of graphene saturable absorber was created to enable for simple Incorporation into a fiber laser cavity. Graphene SA modulation depth with saturation intensity is found to be 66.5% and 0.710.61 MW/cm2, respectively. When put between fiber ferrules, Graphene SA developed self-starting passive Q-switched lasers in the C-bands. The repetition rate of the C-band Q-switched fiber laser increased as the pump power increased, from 4.25 to 47.90 kHz, while the pulse width decreased from 30.35 to 7.2 s. These discoveries demonstrated that graphene is an unique 2D material that may be utilized to create passive Q-switched devices for a range of photonic applications.

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