In-band pumping avenue based high power superfluorescent fiber source with record power and near-diffraction-limited beam quality
High power superfluorescent fiber sources (SFSs), which could find wide applications in many fields such as middle infrared laser generation, Raman fiber laser pumping, and spectral beam combination, have experienced a flourishing time in recent years for its unique properties, such as short coherence length and high temporal stability. The challenge for performance scalability of powerful SFS mainly lies on the physical issues including parasitic laser oscillation and modal instability (MI). In this contribution, by employing in-band pumping avenue and high-order transverse-mode management, we explore a high power SFS with record power, near-diffraction-limited beam quality and spectral manipulation flexibility. An ultimate output power of 3.14 kW can be obtained with high temporal stability and a beam quality of M2=1.59 for the amplified light. Furthermore, the dynamics of spectral evolutions, including red-shifting of central wavelength and unsymmetrical broadening in spectral wings, of the main amplifier with different seed linewidth are investigated contrastively. Benefiting from the unique high pump brightness and high MI threshold of in-band pumping scheme, the demonstrated system also manifests promising performance scaling potential.
作者单位：National University of Denfence Technology
School of optoelectronics, National University of Defense Technology, Room203
Xu Jiangming,Ye Jun,Xiao Hu,Leng Jinyong,Liu Wei,Zhou Pu. In-band pumping avenue based high power superfluorescent fiber source with record power and near-diffraction-limited beam quality[J].High Power Laser Science and Engineering,,():.