Highly stable mode-locked fiber laser with graphene oxide-coated side-polished D-shaped fiber saturable absorber

Harith Bin Ahmad; Soroush Soltani; Kavintheran Thambiratnam; Mohammad Yasin

doi:10.1117/1.OE.57.5.056110

23 May 2018 Highly stable mode-locked fiber laser with graphene oxide-coated side-polished D-shaped fiber saturable absorber

Harith Bin Ahmad, Soroush Soltani, Kavintheran Thambiratnam, Mohammad Yasin

Author Affiliations +

Optical Engineering, Vol. 57, Issue 5, 056110 (May 2018). https://doi.org/10.1117/1.OE.57.5.056110

Abstract

A highly stable mode-lock fiber laser with a thin film coating of graphene oxide (GO) nanoparticles on a D-shaped fiber is proposed and demonstrated. The GO-coated D-shaped fiber, which serves as the cavity’s saturable absorber (SA), is fabricated by drop-casting GO nanoparticles on the smooth and consistently polished area of the D-shaped fiber made using a disk-polishing machine. Mode-locking is induced through the interaction of the evanescent field from the D-shaped fiber and GO nanoparticle layer. The cavity has a length of 12.5 m with a fundamental frequency of 16.5 MHz and operates in the anomalous dispersion regime. Stable soliton mode-locking is obtained above a pump power of 76.6 mW, with a central lasing wavelength of 1555.7 nm and well-defined Kelly’s sidebands. The generated pulses have a repetition rate of 16.5 MHz and pulse duration of 1.18 ps over a pump power range of 76.6 to 280.5 mW, with only minor fluctuations observed. A signal-to-noise ratio of 58.3 dB is computed, indicating a highly stable output. The proposed SA fabrication technique provides a simple, cost-effective, and consistent method of generating mode-locked pulses in fiber lasers.

Citation Download Citation

Harith Bin Ahmad, Soroush Soltani, Kavintheran Thambiratnam, and Mohammad Yasin "Highly stable mode-locked fiber laser with graphene oxide-coated side-polished D-shaped fiber saturable absorber," Optical Engineering 57(5), 056110 (23 May 2018). https://doi.org/10.1117/1.OE.57.5.056110

Received: 15 March 2018; Accepted: 7 May 2018; Published: 23 May 2018

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