All-fiber acousto-optic modulator based on a cladding-etched optical fiber for active mode-locking

作     者：JIHWAN KIM JOONHOI KOO JU HAN LEE 

作者机构：School of Electrical and Computer Engineering University of Seoul 

出 版 物：《Photonics Research》 (光子学研究（英文版）)

年 卷 期：2017年第5卷第5期

页      面：391-395页

核心收录：

学科分类：0808[工学-电气工程] 070207[理学-光学] 0809[工学-电子科学与技术（可授工学、理学学位）] 07[理学] 080902[工学-电路与系统] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：National Research Foundation of Korea(NRF)(2015R1A2A2A04006979,2015R1A2A2A11000907) Institute for Information and Communications Technology Promotion(IITP-2017-2015-0-00385) 

主　　题：All fiber acousto optic modulator based on a cladding etched optical fiber for active mode locking 

摘      要：An all-fiber acousto-optic modulator(AOM), which features a compact structure and a low-driving voltage, is experimentally demonstrated for the active mode-locking of a fiber laser. The proposed AOM is based on the short length of the cladding-etched fiber, the ends of which are fixed on a slide glass. On top of the cladding-etched fiber, a piezoelectric transducer was overlaid. A chemical wet-etching technique, which is based on a mixed solution of NH_4F and (NH_4)2SO_4, is used to reduce the fiber diameter down to ～25 μm, and the length of the etched section is only 0.5 cm. The fabricated device exhibited a modulation depth of 73.10% at an acoustic frequency of 918.9 kHz and a peak-to-peak electrical voltage of 10 V, while a laser beam was coupled at 1560 *** using the prepared AOM within an erbium-doped-fiber ring cavity, the mode-locked pulses with a temporalwidth of 2.66 ps were readily obtained at a repetition rate of 1.838 MHz.