摘要
报道了一种紧凑型930nm被动锁模掺钕全光纤激光器,该激光器由掺钕全光纤振荡器和一级掺钕全光纤放大器构成。振荡器采用线型腔结构,增益介质为长度8cm的高掺杂掺钕石英光纤,抽运源为一个最大功率为200mW的808nm单模半导体激光器,利用半导体可饱和吸收镜实现被动锁模,获得超短脉冲激光输出。振荡器输出平均功率为1mW,重复频率为28.2MHz,脉冲宽度为8.8ps,3dB光谱宽度为0.37nm。为抑制掺钕光纤放大器中1060nm波段激光的竞争,采用长度为10m的W型掺钕光纤作为增益介质进行功率放大,很好地抑制了1060nm波段激光,最终实现了平均功率为117 mW,中心波长为930nm,单脉冲能量为4.15nJ,重复频率为28.2 MHz,脉冲宽度为8.8ps,10dB光谱宽度为2.98nm的脉冲激光输出。
We report a compact 930 nm passive mode-locking Nd-doped all-fiber laser for the first time. The laser consists of a Nd-doped all-fiber oscillator and a Nd-doped all-fiber amplifier. The oscillator uses the linear cavity structure. The gain medium is an 8 cm highly Nd-doped silica fiber, and the pump source is a semiconductor laser with the central wavelength of 808 nm and the maximum output power of 200 mW. By using a semiconductor saturable absorber mirror as saturable absorber to realize passive mode-locking, the ultrashort pulse laser is achieved. The laser generates 8.8 ps pulse width with the average power of 1 mW and the repetition rate of 28.2 MHz. The spectrum has sharp edge with the 3 dB spectral width of 0.37 nm. To avoid the competition from 1060 nm wavelength, we make use of a 10 m W-typed Nd-doped fiber as the gain medium . As a result, the 1060 nm wavelength during the amplification is effectively suppressed. Finally, we achieve a laser output with the average power of 117 mW, the center wavelength of 930 nm, the repetition rate of 28.2 MHz, and the single pulse energy of 4.15 nJ. The pulse width is 8.8 ps and the 10 dB spectrum width is 2.98 nm.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2017年第6期49-54,共6页
Chinese Journal of Lasers
基金
国家自然科学基金(61235010,61307054,61527822)
