Fu Qiang, Wu Yudi, Davidson Ian A, Xu Lin, Jasion Gregory T, Liang Sijing, Rikimi Shuichiro, Poletti Francesco, Wheeler Natalie V, Richardson David J
Opt Lett. 2022 Oct 15;47(20):5301-5304. doi: 10.1364/OL.473230.
We report a high-power single-mode mid-infrared (MIR) pulse delivery system via anti-resonant hollow-core fiber (HCF) with a record delivery distance of 108 m. Near-diffraction-limited MIR light was transmitted by HCFs at wavelengths of 3.12-3.58 µm using a tunable optical parametric oscillator (OPO) as the light source. The HCFs were purged beforehand with argon in order to remove or reduce loss due to parasitic gas absorption (HCl, CO, etc.). The minimum fiber loss values were 0.05 and 0.24 dB/m at 3.4-3.6 µm and 4.5-4.6 µm, respectively, with the 4.5-4.6 µm loss figure representing, to the best of our knowledge, a new low loss record for a HCF in this spectral region. At a coupling efficiency of ∼70%, average powers of 592 mW and 133 mW were delivered through 5 m and 108 m of HCF, respectively. Assuming the 120-ps duration of the MIR pulses remained constant over the low-dispersion HCF (theoretical maximum: 0.4 ps/nm/km), the corresponding calculated peak powers were 4.9 kW and 1.1 kW.
我们报道了一种通过反谐振空芯光纤（HCF）实现的高功率单模中红外（MIR）脉冲传输系统，其传输距离达到了创纪录的108米。使用可调谐光学参量振荡器（OPO）作为光源，HCF在3.12 - 3.58 µm波长下传输近衍射极限的MIR光。预先用氩气吹扫HCF，以消除或减少由于寄生气体吸收（HCl、CO等）导致的损耗。在3.4 - 3.6 µm和4.5 - 4.6 µm波长下，光纤的最小损耗值分别为0.05和0.24 dB/m，据我们所知，4.5 - 4.6 µm的损耗值代表了该光谱区域中HCF的新低损耗记录。在耦合效率约为70%的情况下，分别通过5米和108米的HCF传输了592 mW和133 mW的平均功率。假设MIR脉冲的120 ps持续时间在低色散HCF上保持恒定（理论最大值：0.4 ps/nm/km），相应计算出的峰值功率分别为4.9 kW和1.1 kW。
