期刊
JOURNAL OF LIGHTWAVE TECHNOLOGY
卷 35, 期 11, 页码 2161-2166出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2017.2676241
关键词
Fiber lasers; mode selective coupler; optical vortices; orbital angular momentum; ultrafast optics
资金
- National Natural Science Foundation of China [61635006, 11274224, 61475098]
- Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning and Science and Technology Commission of Shanghai Municipality [16520720900]
We experimentally demonstrated a high-order optical vortex pulsed laser based on a mode selective all-fiber fused coupler composed of a single-mode fiber (SMF) and a few-mode fiber (FMF). The fused SMF-FMF coupler inserted in the cavity acts as a mode converter from LP01 mode to LP11 (LP21) mode with a broadband width. Linearly polarized OAM modes can be obtained by combining different vector modes HE2,meven (HE2,modd) and TE0,m (TM0,m) when l = 1 or combining HEl+1,meven (HEl+1,modd) and EHl-1,modd (EHl-1,meven) when l > 1 with a pi/2 phase shift. To the best of our knowledge, this is the first report on the generation of high-order pulse vortex beams in a mode-locked fiber laser. The measured time duration of OVB pulses is 273 fs, 140 fs of OAM(+/- 1) and OAM(+/- 2).
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