Collection Of theses on high power laser and plasma physics, 2014, 12 (1): 6605, Published Online: Jun. 2, 2017
High-power and highly efficient operation of wavelength-tunable Raman fiber lasers based on volume Bragg gratings
Abstract
Highly efficient and high-power operation of Raman fiber lasers in fixed-wavelength and wavelength-tunable cavity configurations based on a graded-index multimode fiber is reported. Fixed-wavelength and wavelength tunable operating regimes are achieved using volume Bragg gratings (VBGs) with center wavelengths of 1658 nm and 1750 nm, respectively. The fixed-wavelength laser yielded a maximum output power of 10.5 W at 1658.3 nm with a FWHM linewidth of ~0.1 nm for the launched pump power of 23.4 W, corresponding to a slope efficiency of 82.7% with respect to the launched pump power. The measured beam quality in the form of M2 factor is ~1.35, corresponding to the fundamental mode of the fiber. For the wavelength-tunable Raman fiber laser, a wavelength tuning range of 37 nm from 1638.5 to 1675.1 nm is obtained with a maximum output power of 3.6 W at 1658.5 nm for the launched pump power of 13.0 W.
Jun Liu, Deyuan Shen, Haitao Huang, Chujun Zhao, Xiaoqi Zhang, Dianyuan Fan. High-power and highly efficient operation of wavelength-tunable Raman fiber lasers based on volume Bragg gratings[J]. Collection Of theses on high power laser and plasma physics, 2014, 12(1): 6605.