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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。
Reported a compact 930nm passively mode-locked neodymium-doped all-fiber laser consisting of a neodymium-doped all-fiber oscillator and a neodymium-doped all-fiber amplifier. The oscillator adopts a linear cavity structure. The gain medium is a highly doped neodymium-doped quartz fiber with a length of 8 cm. The pumping source is an 808 nm single-mode semiconductor laser with a maximum power of 200 mW. Passively mode-locked with a saturable absorber mirror, Ultrashort pulse laser output. Oscillator output average power of 1mW, repetition rate of 28.2MHz, pulse width of 8.8ps, 3dB spectral width of 0.37nm. In order to restrain the competition of 1060nm laser in neodymium-doped fiber amplifier, W-type neodymium-doped fiber with length of 10m was used as the gain medium to amplify the power. The 1060nm laser was well suppressed and the average power was 117mW. The center wavelength 930 nm, a single pulse energy of 4.15 nJ, a repetition frequency of 28.2 MHz, a pulse width of 8.8 ps and a 10 dB spectral width of 2.98 nm pulsed laser output.