[论文解读] Programmable spectral phase transfer to the ultraviolet by gas-filled-fibre four-wave mixing

Linshan Sun, Hao Zhang+3 more|arXiv (Cornell University)|Mar 20, 2026

Laser-Matter Interactions and Applications被引用 0

一句话总结

该论文演示了通过气体充填的空芯光纤中的色散四波混频，将编程的光谱相位从近红外传输到紫外，实现无需窄带泵的紫外脉冲成形。

ABSTRACT

Programmable shaping of femtosecond ultraviolet (UV) pulses is still much less flexible than at visible and near-infrared wavelengths, mainly because direct UV modulators remain limited in bandwidth, throughput and damage threshold. Here we show that dispersive four-wave mixing (DFWM) in a gas-filled hollow-cappillary fibre (HCF) can transfer programmed spectral phase from the near infrared (NIR) to the UV without relying a narrowband pump. A shaped NIR signal at 1032 nm and a chirped 516-nm pump generate a 344-nm idler, which is characterized with transient-grating frequency-resolved optical gating (TG FROG). As a benchmark, second-order dispersion (SOD) applied to the signal is quantitatively reproduced in the idler. We then demonstrate the transfer of two nontrivial phase patterns: a localized nominal π-step and a moderate sinusoidal modulation. In the π-step case, a step imposed on the long-wavelength side of the signal appears on the short-wavelength side of the idler, consistent with the 2*pump - 1*signal mixing relation. In the sinusoidal case, the periodic phase produces a split temporal waveform in both signal and idler. These results show that gas-filled HCF DFWM can act as a practical spectral-phase transducer from the NIR to the UV, while also revealing a trade-off between conversion efficiency and phase-transfer fidelity.

研究动机与目标

• 推动超越直接UV调制器局限性的灵活紫外脉冲成形。
• 证明一个色散四波混频方案，将近红外光谱相位映射到紫外。
• 证明通过带啁啾的泵使经整形的近红外信号 transfer其相位到紫外倚靠 idler。
• 通过再现二阶色散并转移非平凡的相位模式来基准化相位转移。

提出的方法

• 使用气体充填的空芯毛细管中的色散四波混频，从1032-nm信号和516-nm泵生成344-nm的idler。
• 对NIR信号进行成形并应用啁啾泵以诱导相位转移。
• 用瞬时光栅频率分辨光学门控（TG FROG）表征idler。
• 在基准测试中量化地将idler相位与信号的二阶色散进行比较。
• 演示两种相位模式的转移：名义上的π阶跃和正弦调制。
• 讨论转换效率与相位转移保真度之间的权衡。

实验结果

研究问题

• RQ1 在气体充填的空芯光纤中，色散四波混频是否可以在不依赖窄带泵的情况下实现从NIR到UV的光谱相位转移？
• RQ2 常见的相位模式（π阶跃、正弦）从信号到紫外idler的映射有多忠实？
• RQ3 在该方案中，转换效率与相位转移保真度之间的关系是什么？

主要发现

• 从1032-nm信号和516-nm泵生成344-nm UV idler，实现紫外光谱相位转移。
• idler的相位忠实地再现了信号的二阶色散，验证了转移机制。
• 对信号施加的名义π阶跃通过2*pump − 1*signal混频关系转移到idler。
• 对信号施加的中等强度正弦相位在信号和idler上产生分裂的时间波形。
• 非平凡的相位模式可以被转移，显示可编程的紫外光谱成形。
• 存在转换效率与相位转移保真度之间的权衡。