Opto-Electronic Engineering
Opto-Electronic EngineeringPrevious  
Vol. 47, No. 11, 2020
Cover:Yao H, Shi F, Huang Y P, et al. Mode-locked Yb-doped fiber laser based on mode coupler[J]. Opto-Electronic Engineering, 2020, 47(11): 200040

Ultrashort laser micro-machining has been widely applied in the industrial field.In the optical fiber laser system, the optical field manipulation and mode coherent control based on fiber eigenmodes provide new ideas for the new type optical field manipulation.At present, fiber mode converters are mainly based on the generation and transmission of higher-order modes in few-mode fibers. The detailed methods include misplaced excitation, fiber grating mode coupling, fiber evanescent field coupling, and acousto-optic mode coupling.
The research group of Prof. Zeng Xianglong from Shanghai University has demonstrated HOM directly oscillating in a mode-locked Yb-doped fiber laser (YDFL). A pair of mode selective couplers (MSCs) acts as an efficient mode convertor to generate the oscillate HOMs in 1.0 micron laser wavebands. This method can achieve mode-locked HOM pulses in a Yb-doped few-mode fiber cavity.
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Yao Han, Shi Fan, Huang Yiping, et al. Mode-locked Yb-doped fiber laser based on mode coupler[J]. Opto-Electronic Engineering, 2020, 47(11): 200040.