摘要
近年来,超快掺镱锁模光纤激光器由于其转换效率高、操作方便、免维护、尺寸紧凑等优点,被广泛应用于工业加工、医疗外科、多光子成像等领域。在激光器中补偿群速度色散是获得皮秒甚至飞秒脉冲的有效方法。通过利用光栅对与光谱滤波器,实现了对激光波长、腔内色散和光谱宽度的灵活调节。该激光器能输出稳定的锁模脉冲,对应的基本重复频率为19.41 MHz。在+0.012 7 ps^(2)色散时中心波长1 015~1 037 nm可调;在+0.007 ps^(2)色散时中心波长1 015~1 045 nm可调以及在-0.012 7 ps^(2)色散时中心波长1 020~1 046 nm可调。同时,当净腔色散从反常色散到近零色散变化时,光谱带宽可从1.40 nm调到19.38 nm,对应的压缩后脉冲宽度可从1.03 ps调至175.9 fs。该方案具备连续调整激光器状态的能力,有望用于高功率大能量飞秒激光前端,可以满足对激光器有多种谱宽及波长的应用需求。
In recent years, ultra-fast ytterbium doped mode-locked fiber lasers have been widely used in industrial processing, medical surgery, multiphoton imaging and other fields due to their high conversion efficiency, convenient operation, free maintenance and compact size. Compensation of group velocity dispersion in lasers was an effective method to obtain picosecond or femtosecond pulses. A grating pair and a spectral filter were used to adjust the dispersion and spectral width of laser wavelength in cavity flexibly, the laser can output stable mode-locked pulses with the corresponding fundamental repetition frequency of 19.41 MHz. The central wavelength can be adjusted from 1 015 nm to 1 037 nm when the net cavity dispersion was +0.012 7 ps^(2). In the case of +0.007 ps^(2) dispersion, the central wavelength can be adjusted from 1 015 nm to 1 045 nm and when the net cavity dispersion was-0.012 7 ps^(2), the central wavelength can be adjusted from 1 020 nm to 1 046 nm.Meanwhile, when the net cavity dispersion changed from abnormal to nearly zero dispersion, the spectral bandwidth can be adjusted from 1.40 nm to 19.38 nm, and the corresponding pulse width after compression can be adjusted from 1.03 ps to 175.9 fs. The proposed and demonstrated scheme is capable of continuously adjusting the state of the laser, and is expected to be used in the development of a femtosecond laser front-end with high power and high energy, which can meet the application requirements of lasers with a alterable of spectrum widths and wavelengths.
作者
刘梦霖
赵坤
闫炜
王丽莎
刘民哲
王勇
孙松松
Liu Menglin;Zhao Kun;Yan Wei;Wang Lisha;Liu Minzhe;Wang Yong;Sun Songsong(Laser Institute,Qilu University of Technology(Shandong Academy of Sciences),Qingdao 266100,China)
出处
《红外与激光工程》
EI
CSCD
北大核心
2022年第6期185-189,共5页
Infrared and Laser Engineering
基金
山东省重点研发计划(重大科技创新工程)(2021CXGC010202)
山东省自然科学基金(ZR2020QF094,ZR2020MF117,ZR2021MF112)
山东省科学院国际合作项目(2019GHPY12,2020KJC-GH01)
山东省科学院青年科学基金(2019QN0027,2019QN0030)。
关键词
飞秒
掺镱激光器
光栅对
激光调谐
femtosecond
ytterbium doped fiber laser
grating pair
laser tuning
