Sponsor(s): Chinese Optical Society；Shanghai Institute of Optics and Fine Mechanics，Chinese Academy of Sciences
12 issues per year
Current Issue: Issue 10, 2019
Chinese Journal of Lasers, regarded as a flag-ship journal in China, reports the most fresh and influential research in the laser field. Founded in 1974, the journal is administrated by Chinese Academy of Sciences (CAS), sponsored by Shanghai Institute of Optics and Fine Mechanics, CAS, and Chinese Optical Society, and published by Chinese Laser Press. The featured columns include laser physics，laser manufacturing，materials and thin films,measurement and metrology ,beam transmission and control, optical communications, biomedical photonics and laser medicine, nonlinear optics, holography and information processing, remote sensing and sensor, spectroscopy, quantum optics, micro and nano optics, terahertz technology, rapid communications, and so on. Chinese Journal of Lasers is indexed in the following databases: EI, Scopus, AJ, CA, INSPEC, CSCD, etc. It has been titled as one of the“100 Chinese Top S&T Journal”,“100 Chinese Outstanding Academic Journal”,“Outstanding S&T Journals of China”,and “The Most International Influencing Academic Journal in China”.
Wang Zhijiang, Xu Zhizhan, Fan Dianyuan, Du Xiangwan
Chen Weibiao, Zhou Shouhuan, Cheng Zhaogu, Liu Zejin, Zhang Xiaoming, Lv Zhiwei, Zhou Jun,
Chinese Journal of Lasers,2019,Vol 46,No. 10
To study the limits of improvements of the high-power large-field fiber power and brightness caused by the thermo-optic effect and thermal-induced mode instability under strong pumping conditions, we analyze the influence of the variation of absorption coefficient on the thermal deposition, thermal-induced refractive index, and numerical aperture of a fiber. Results show that a fiber with a high absorption coefficient causes a high heat load density, and its numerical aperture increases under the thermal-optic effect modulation, thereby reducing the mode instability threshold. Based on the theoretical research, fibers with two different pump absorption coefficients are designed and fabricated, and high-power mode instability experiments are performed. Experimental results show that the mode instability threshold power is 800 W for the high pump absorption fiber with an absorption coefficient of 1.71 dB/m. However, for the fiber with a low pump absorption coefficient of 1.20 dB/m, the mode instability is not observed when the output power reaches 1 700 W. Thus, we can considerably improve the mode instability threshold by decreasing the pump absorption coefficient of the active fiber. These results are significant to the development of high-power active optical fibers and provide a novel and effective technical approach for obtaining high-power fiber laser output.