Ultraviolet supercontinuum generation using a differentially-pumped integrated glass chip

IF 4.6 Q1 OPTICS Journal of Physics-Photonics Pub Date : 2024-03-07 DOI:10.1088/2515-7647/ad2bd3
Vincent Wanie, Pasquale Barbato, Josina Hahne, Sergey Ryabchuk, Ammar Bin Wahid, David Amorim, Erik P Månsson, Andrea Trabattoni, Roberto Osellame, Rebeca Martínez Vázquez, Francesca Calegari
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Abstract

We investigate the generation of ultrabroadband femtosecond ultraviolet (UV) radiation via third-order harmonic generation in highly confined gas media. A dual-stage differential-pumping scheme integrated into a glass microfluidic chip provides an exceptional gas confinement up to several bar and allows the apparatus to be operated under high-vacuum environment. UV pulses are generated both in argon and neon with up to ∼0.8 μJ energy and 0.2% conversion efficiency for spectra that cover the UVB and UVC regions between 200 and 325 nm. Numerical simulations based on the unidirectional pulse propagation equation reveal that ionization plays a critical role for extending the spectral bandwidth of the generated third-harmonic pulse beyond the tripled 800 nm driving laser pulse bandwidth. By delivering UV supercontinua supporting Fourier transform limits below 2 fs, as well as comparable pulse energies with respect to capillary-based techniques that typically provide high spectral tunability but produce narrower bandwidths, our compact device makes a step forward towards the production and application of sub-fs UV pulses for the investigation of electron dynamics in neutral molecules.
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利用差分泵浦集成玻璃芯片产生紫外超连续真空
我们研究了在高度封闭的气体介质中通过三阶谐波生成超宽带飞秒紫外线(UV)辐射的问题。集成在玻璃微流控芯片中的双级差分泵方案提供了高达数巴的超强气体封闭性,并使仪器能够在高真空环境下运行。在氩气和氖气中产生的紫外线脉冲能量高达 ∼ 0.8 μJ,转换效率为 0.2%,光谱范围覆盖 200 至 325 nm 的 UVB 和 UVC 区域。基于单向脉冲传播方程的数值模拟显示,电离在将所产生的三次谐波脉冲的光谱带宽扩展到三倍 800 nm 驱动激光脉冲带宽之外方面起着关键作用。通过提供支持低于 2 fs 傅立叶变换极限的紫外超连续波,以及与通常提供高光谱可调谐性但产生较窄带宽的基于毛细管的技术相当的脉冲能量,我们的紧凑型设备在生产和应用亚 fs 紫外脉冲以研究中性分子中的电子动力学方面向前迈进了一步。
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来源期刊
CiteScore
10.70
自引率
0.00%
发文量
27
审稿时长
12 weeks
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