A full-open-cavity wavelength-tunable random fiber laser(WT-RFL) with compact structure and hundreds of picometers tuning range is proposed and demonstrated. A π fiber Bragg grating(FBG) is used in the WT-RFL as a fi...A full-open-cavity wavelength-tunable random fiber laser(WT-RFL) with compact structure and hundreds of picometers tuning range is proposed and demonstrated. A π fiber Bragg grating(FBG) is used in the WT-RFL as a filter to select lasing wavelengths. The two random Bragg grating arrays(RBGAs) and a section of high gain erbium-doped fiber result in a low lasing threshold and high stability. A numerical model to analyze the tunable characteristics is developed. The results show that the laser threshold is 22 m W, and the maximum peak-power fluctuation is 0.55 d B. To the best of our knowledge, it is the first time that a compact and full-open-cavity WT-RFL with two RBGAs and a π-FBG is proposed.展开更多
基金supported by the National Natural Science Foundation of China (NSFC) (Nos. 61875185 and U1939207)the Scientific Instrument Developing Project of the Chinese Academy of Sciences+1 种基金the Strategic Priority Research Program A of the CAS (No. XDA22010201)the Shenzhen Science and Technology Research Funding (No. JCYJ20190814110601663)
文摘A full-open-cavity wavelength-tunable random fiber laser(WT-RFL) with compact structure and hundreds of picometers tuning range is proposed and demonstrated. A π fiber Bragg grating(FBG) is used in the WT-RFL as a filter to select lasing wavelengths. The two random Bragg grating arrays(RBGAs) and a section of high gain erbium-doped fiber result in a low lasing threshold and high stability. A numerical model to analyze the tunable characteristics is developed. The results show that the laser threshold is 22 m W, and the maximum peak-power fluctuation is 0.55 d B. To the best of our knowledge, it is the first time that a compact and full-open-cavity WT-RFL with two RBGAs and a π-FBG is proposed.
文摘太阳望远镜采用全开式圆顶有许多好处,但是此时风对望远镜产生比较大的扰动。为了减少风对望远镜的影响,设计了阻导风板,并在实际应用中得到了很好的结果。全面介绍了阻导风板的原理、结构,并给出了设计要点及在1 m红外太阳望远镜(New Vacuum Solar Telescope,NVST)上的实测结果。
