Fe3O4 nanoparticles as a saturable absorber for a tunable Q-switched dysprosium laser around 3μm  

作　　者：JIAN YANG JIYI HU HONGYU LUO JIANFENG LI JISHU LIU XIAOHUI LI YONG LIU 

机构地区：[1]State Key Laboratory of Electronic Thin Films and Integrated Devices,School of Optoelectronic Science and Engineering,University of Electronic Science and Technology of China(UESTC),Chengdu 610054,China [2]School of Physics and Information Technology,Shaanxi Normal University,Xi'an 710119,China

出　　处：《Photonics Research》2020年第1期70-77,共8页光子学研究（英文版）

基　　金：National Natural Science Foundation of China(61421002,61435003,61605106,61722503);Fundamental Research Funds for the Central Universities(ZYGX2019Z012);Joint Fund of Ministry of Education for Equipment Pre-research(6141A02033411);Field Funding for Equipment Pre-research(61404140106,1114180106A)。

摘　　要：We demonstrate for the first time to our knowledge the use of Fe3O4 nanoparticles for Q-switching a tunable midinfrared(Mid-IR)Dy^3+-doped ZBLAN fiber laser around 3μm.The Q-switcher was fabricated by depositing the prepared Fe3O4 nanoparticles solution onto an Au mirror.Its nonlinear optical response was characterized using a mode locked Ho^3+/Pr^3+-codoped ZBLAN fiber laser at 2.87μm,and showed a modulation depth of 11.9%as well as a saturation intensity of 1.44 MW/cm^2.Inserting the device into a tunable Dy^3+-doped ZBLAN fiber laser,stable Q-switched pulses within the tunable range of 2812.4-3031.6 nm were obtained.When tuning the wavelength to 2931.2 nm,a maximum Q-switching output power of 111.0 mW was achieved with a repetition rate of 123.0 kHz and a pulse width of 1.25μs.The corresponding pulse energy was 0.90μJ.This demonstration suggests that Fe3O4 nanoparticles are a promising broadband saturable absorption material for mid-infrared operation.

关 键 词：TUNABLE SWITCHED LASER 

分 类 号：TN248.34[电子电信—物理电子学]