Lee, J. Koo, J. Debnath, P. Song, Y-W Lee, J. H. 2024-01-20T12:35:07Z 2024-01-20T12:35:07Z 2022-01-10 2013-03 1612-2011 https://pubs.kist.re.kr/handle/201004/128279 We demonstrate the use of a graphene oxide (GO)-deposited D-shaped fiber as a polarization sensitive saturable absorber for the implementation of a stable Q-switched, mode-locked fiber laser. Using both features of nonlinear saturable absorption and large polarization dependence loss of GO-deposited D-shaped fiber, stable Q-switched mode-locked pulses are readily obtained from an erbium-doped fiber ring laser through simple intra-cavity polarization control under a fixed pump power. It is shown that bursts of sub-picosecond, mode-locked pulses with a Q-switching envelope of a similar to 2.63 mu s temporal width and a similar to 71.3 kHz repetition rate can readily be generated from the laser. It is also demonstrated that the operating regime of the pulsed laser can be readily changed between mode-locking, Q-switched mode-locking, and Q-switching simply by changing the polarization state of the oscillated beam within the cavity. English IOP PUBLISHING LTD EVANESCENT FIELD INTERACTION CARBON NANOTUBE LOCKING A Q-switched, mode-locked fiber laser using a graphene oxide-based polarization sensitive saturable absorber Article 10.1088/1612-2011/10/3/035103 1 LASER PHYSICS LETTERS, v.10, no.3 LASER PHYSICS LETTERS 10 3 scie scopus 000315461000006 2-s2.0-84879054073 Optics Physics, Applied Optics Physics Article EVANESCENT FIELD INTERACTION CARBON NANOTUBE LOCKING graphene oxide Q-switch mode-locking saturable absorber fiber laser