Abstract

The conversion of energy into the mid-IR region (>2.2 μm) upon pumping by chirped picosecond pulses at a wavelength of 1.56 μm into a gas-filled hollow-core revolver-type fiber is studied numerically. It is shown that the combined cascade SRS process at vibrational-rotational levels in a D₂/N₂ mixture increases the degree of supercontinuum coherence and the maximum quantum efficiency of SRS conversion compared to a single-cascade process in deuterium. The possibility of obtaining a supercontinuum in the 3-μm band with a spectral width of 1800 nm and with a maximum quantum conversion efficiency of 48% in the range of D₂ and N₂ partial pressures up to 50 atm was demonstrated.

中文翻译：

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填充氘和氮混合物的空心光纤中的相干中红外超连续谱

摘要

对波长为 1.56 μm 的啁啾皮秒脉冲泵浦到充气空心旋转型光纤中时能量到中红外区域 (>2.2 μm) 的转换进行了数值研究。结果表明，与氘中的单级联过程相比， D ₂ /N _{2混合物中振动-旋转水平的组合级联SRS过程提高了超连续谱相干度和SRS转换的最大量子效率。}证明了在 3 μm 波段获得光谱宽度为 1800 nm 的超连续谱的可能性，在 D ₂和 N ₂分压高达 50 atm 的范围内，最大量子转换效率为 48%。