Generation of a VUV-to-visible Raman frequency comb in hydrogen-filled kagomé photonic crystal fiber

Abstract

We report the generation of a purely vibrational Raman comb, extending from the vacuum ultraviolet (184 nm) to the visible (478 nm), in hydrogen-filled kagomé-style photonic crystal fiber pumped at 266 nm. Stimulated Raman scattering and molecular modulation processes are enhanced by higher Raman gain in the ultraviolet. Owing to the pressure-tunable normal dispersion landscape of the fiber-gas system in the ultraviolet, higher-order anti-Stokes bands are generated preferentially in higher-order fiber modes. The results pave the way towards tunable fiber-based sources of deep- and vacuum ultraviolet light for applications in, e.g., spectroscopy and biomedicine.

4 pages, 5 figures, 1 table

References in corpus (4)

• Single-mode optical fiber for high-power, low-loss UV transmission
• Damage-free single-mode transmission of deep-UV light in hollow-core PCF
• Broadband-tunable LP${}_{01}$ mode frequency shifting by Raman coherence waves in H${}_2$-filled hollow-core PCF
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• Thresholdless deep and vacuum ultraviolet Raman frequency conversion in H${}_2$-filled photonic crystal fiber