2μm波段宽调谐超短脉冲激光及其应用研究

发布时间：2018-03-28 19:01

本文选题：2μm超短脉冲激光　切入点：可调谐光纤激光器　出处：《吉林大学》2017年博士论文

【摘要】：2μm超短脉冲光纤激光器具有脉冲宽度窄、峰值功率高、频谱范围宽等特点,在基础科学研究、生物医疗、材料加工、环境监测、军事等方面有着重要的应用。宽调谐2μm超短脉冲激光作为该波段光纤激光器发展的一个重要方向,一直是该领域的研究热点。在众多的波长调谐技术中,全光纤多模干涉滤波器具有结构紧凑、与光纤兼容等特点,备受研究者们关注。但目前,基于多模干涉滤波器的全光纤宽调谐2μm超短脉冲激光器未见报道。另外,在2μm超短脉冲激光的应用方面,尤其是中红外超连续谱产生研究方面,由于2μm激光的波长处于中红外波段,所以其在获得高转换效率的中红外超连续谱方面有一定的优势。但在高相干性中红外超连续光源研究方面,国内外报道甚少。针对上述问题,本论文围绕2μm超短脉冲光纤激光器的波长调谐技术以及基于2μm超短脉冲激光获得高相干性的中红外超连续光源等方面进行了系统的研究,取得了以下研究结果:(1)利用自制的具有多个透射峰的全光纤多模干涉滤波器,采用弯曲多模光纤的方法,首次实现了波长调谐范围覆盖1919.6~2014.9 nm的全光纤锁模激光器。该实验证明了采用多模干涉滤波器可以实现全光纤宽调谐锁模激光器。(2)利用拉曼孤子自频移技术获得了波长调谐范围覆盖1611~1984 nm的全光纤超短脉冲激光器。在实验中,所用的泵浦源为1560 nm飞秒脉冲光纤激光器,所用的非线性介质为10 m长的高非线性石英光纤,通过优化泵浦源和高非线性光纤参数获得了宽调谐拉曼孤子激光输出。(3)采用啁啾脉冲放大技术获得了平均功率为2.1 W,脉冲宽度为170 fs的2μm超短脉冲激光输出;进一步利用其作为泵浦源,采用自制的拉锥氟碲酸盐微结构光纤作为非线性介质,首次获得了高相干性、波长范围覆盖1.4~4μm波段的超连续光源。
[Abstract]:The 2 渭 m ultrashort pulse fiber laser is characterized by narrow pulse width, high peak power and wide spectrum range. It is widely used in basic science, biomedicine, material processing, environmental monitoring, etc. The wide tunable 2 渭 m ultrashort pulse laser, as an important direction of the development of fiber laser in this band, has always been the research hotspot in this field. The all-fiber multimode interference filter has been paid much attention by researchers because of its compact structure and compatibility with fiber. But at present, the all-fiber wide tuning 2 渭 m ultrashort pulse laser based on multimode interference filter has not been reported. In the application of 2 渭 m ultrashort pulse laser, especially in the research of mid-infrared supercontinuum, the wavelength of 2 渭 m laser is in the mid-infrared band. Therefore, it has some advantages in obtaining high conversion efficiency mid-infrared supercontinuum spectra. However, there are few reports at home and abroad on the study of high coherence mid-infrared supercontinuum light sources. In this thesis, the wavelength tuning technology of 2 渭 m ultrashort pulse fiber laser and the high coherence medium infrared supercontinuum light source based on 2 渭 m ultrashort pulse laser are systematically studied. The following results are obtained: (1) using self-made all-fiber multimode interference filter with multiple transmission peaks, the method of bending multimode fiber is adopted. An all-fiber mode-locked laser with wavelength tunable range of 1919.6n / 2014.9 nm is first realized. The experiment proves that all-fiber wide-tuned mode-locked laser can be realized by using multi-mode interference filter (MIFF) and Raman soliton self-frequency shift technique is used to obtain the mode-locked laser. An all-fiber ultrashort pulse laser with tunable wavelength range of 1611 ~ 1984 nm. The pump source is 1560 nm femtosecond pulsed fiber laser and the nonlinear medium is 10 m long high nonlinear quartz fiber. By optimizing the pump source and the parameters of high nonlinear optical fiber, the wide tuning Raman soliton laser output is obtained. (3) using chirped pulse amplification technique, 2 渭 m ultrashort pulses with an average power of 2.1 W and a pulse width of 170 fs are obtained. Furthermore, using it as pump source and using self-made tapered fluorotellurite microstructural fiber as nonlinear medium, a supercontinuous light source with high coherence and wavelength range of 1.4 渭 m was obtained for the first time.
【学位授予单位】：吉林大学
【学位级别】：博士
【学位授予年份】：2017
【分类号】：TN248

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