Choi, Sun Young Cho, Dae Kun Song, Yong-Won Oh, Kyunghwan Kim, Kihong Rotermund, Fabian Yeom, Dong-Il 2024-01-20T15:30:54Z 2024-01-20T15:30:54Z 2021-09-05 2012-02-27 1094-4087 https://pubs.kist.re.kr/handle/201004/129524 We demonstrate a novel in-line saturable absorber based on hollow optical fiber (HOF) filled with graphene composite for high power operation of mode-locked fiber laser. Evanescent field of guided mode propagating in few centimeter-long HOF interacts with the graphene/polyvinyl acetate (PVAc) composite, which enables robust and efficient nonlinear absorption leading to stable passive mode-locking. The mode-locked fiber laser generates soliton pulses with 5.9-nm spectral bandwidth and its maximum output power is measured up to 80 mW. We also observe passive harmonic mode-locking of soliton laser delivering stable pulses with a repetition rate of 506.9 MHz at 33rd harmonics. (c) 2012 Optical Society of America English OPTICAL SOC AMER CARBON NANOTUBES PULSED LASERS OPTOELECTRONICS PHOTONICS Graphene-filled hollow optical fiber saturable absorber for efficient soliton fiber laser mode-locking Article 10.1364/OE.20.005652 1 OPTICS EXPRESS, v.20, no.5, pp.5652 - 5657 OPTICS EXPRESS 20 5 5652 5657 scie scopus 000301053200087 2-s2.0-84857510233 Optics Optics Article CARBON NANOTUBES PULSED LASERS OPTOELECTRONICS PHOTONICS graphene fiber laser mode-locking