Genier Etienne, Grelet Sacha, Engelsholm Rasmus D, Bowen Patrick, Moselund Peter M, Bang Ole, Dudley John M, Sylvestre Thibaut
Opt Lett. 2021 Apr 15;46(8):1820-1823. doi: 10.1364/OL.420676.
We report an octave-spanning coherent supercontinuum (SC) fiber laser with excellent noise and polarization properties. This was achieved by pumping a highly birefringent all-normal dispersion photonic crystal fiber with a compact high-power ytterbium femtosecond laser at 1049 nm. This system generates an ultra-flat SC spectrum from 670 to 1390 nm with a power spectral density higher than 0.4 mW/nm and a polarization extinction ratio of 17 dB across the entire bandwidth. An average pulse-to-pulse relative intensity noise down to 0.54% from 700 to 1100 nm was measured and found to be in good agreement with numerical simulations. This highly stable broadband source could find strong potential applications in biomedical imaging and spectroscopy where an improved signal-to-noise ratio is essential.
我们报道了一种具有出色噪声和偏振特性的倍频程相干超连续谱（SC）光纤激光器。这是通过用一台紧凑型高功率1049 nm镱飞秒激光器泵浦一根高双折射全正色散光子晶体光纤实现的。该系统在670至1390 nm范围内产生超平坦的SC光谱，功率谱密度高于0.4 mW/nm，并且在整个带宽内偏振消光比为17 dB。测量发现，从700至1100 nm平均脉冲间相对强度噪声低至0.54%，并且与数值模拟结果吻合良好。这种高度稳定的宽带光源在生物医学成像和光谱学中具有强大的潜在应用，在这些领域中提高信噪比至关重要。
