Generation of coexisting high-energy pulses in a mode-locked all-fiber laser with a nonlinear multimodal interference technique

查看全文 作　　者：GUANGWEI [1,2]CHEN;WENLEI [1,2]LI;GUOMEI [1,2]WANG;WENFU [1,2]ZHANG;CHAO [1,2]ZENG;WEI [1,2]ZHAO

机构地区：[1]State Key Laboratory of Transient Optics and Photonics,Xi’an Institute of Optics and Precision Mechanics,Chinese Academy of Sciences;[2]University of Chinese Academy of Sciences (UCAS)

出　　处：《Photonics Research》索引2019年第7卷第2期,共6页

基　　金：National Natural Science Foundation of China(NSFC)(61475188,61635013,61805277);Chinese Academy of Sciences(CAS)Strategic Priority Research Program and Light of West China Program(XDB24030600,XAB2017A09) 摘　　要：We demonstrate a passively mode-locked all-fiber laser incorporating a piece of graded-index multimode fiber as a mode-locking modulator based on a nonlinear multimodal interference technique, which generates two types of coexisting high-energy ultrashort pulses [i.e., the conventional soliton(CS) and the stretched pulse(SP)]. The CS with pulse energy as high as 0.38 n J is obtained at the pump level of 130 mW. When the pump increases to175 mW, the high-energy SP occurs at a suitable nonlinear phase bias and its pulse energy can reach 4 n J at a 610 mW pump. The pulse durations of the generated CS and SP are 2.3 ps and 387 fs, respectively. The theory of nonlinear fiber optics, single-shot spectral measurement by the dispersive Fourier-transform technique, and simulation methods based on the Ginzburg–Landau equation are provided to characterize the laser physics and reveal the underlying principles of the generated CS and SP. A rogue wave, observed between the CS and SP regions, mirrors the laser physics behind the dynamics of generating a high-energy SP from a CS. The proposed all-fiber laser is versatile, cost-effective and easy to integrate, which provides a promising solution for high-energy pulse generation. 关键词：GENERATION HIGH-ENERGY PULSES

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Generation of coexisting high-energy pulses in a mode-locked all-fiber laser with a nonlinear multimodal interference technique

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