Investigation of the long wavelength limit of soliton self-frequency shift in a silica fiber.
Investigation of the long wavelength limit of soliton self-frequency shift in a silica fiber.
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DOI：
10.1364/oe.26.019637
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发表时间：
2018-07
期刊：
影响因子：
3.8
通讯作者：
Bo Li;Mengran Wang;K. Charan;Ming-Jun Li;Chris Xu
中科院分区：
文献类型：
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作者：
Bo Li;Mengran Wang;K. Charan;Ming-Jun Li;Chris Xu
我们通过实验和数值模拟研究了硅基光纤中孤子自频移的长波长极限。我们发现，孤子自频移产生的最长波长孤子约为2500 nm，这是因为在2400 nm以上，由于二氧化硅和水的材料吸收，孤子的能量迅速损失。我们展示了1580-2520 nm波长可调谐，高脉冲能量孤子产生利用孤子的自频移在大模场面积的石英光纤由一个紧凑的光纤源泵浦。获得了脉宽约100 fs，脉冲能量达73 nJ的孤子脉冲。二次谐波产生的孤子，使波长可调谐飞秒光源从950 nm到1260 nm，脉冲能量高达21 nJ。使用这种充满活力的脉冲，我们证明了在体内的双光子激发荧光成像的血管和神经元在小鼠大脑中的波长超出了锁模钛：蓝宝石激光器的调谐范围。
We explore the long wavelength limit of soliton self-frequency shift in silica-based fibers experimentally and using numerical simulation. We found that the longest wavelength soliton generated by soliton self-frequency shift is approximately 2500 nm because the soliton loses its energy rapidly at wavelength beyond 2400 nm due to material absorption by silica and water. We demonstrate 1580-2520 nm wavelength-tunable, high-pulse energy soliton generation using soliton self-frequency shift in a large-mode-area silica fiber pumped by a compact fiber source. Soliton pulses with pulse width of ~100 fs and pulse energy up to 73 nJ were obtained. Second harmonic generation of the solitons enables a wavelength-tunable femtosecond source from 950 nm to 1260 nm, with pulse energy up to 21 nJ. Using such energetic pulses, we demonstrate in vivo two-photon excited fluorescence imaging of vasculature and neurons in a mouse brain at wavelength beyond the tuning range of a mode-locked Ti:Sapphire lasers.