From Raman Frequency Combs to Supercontinuum Generation in Nitrogen‐Filled Hollow‐Core Anti‐Resonant Fiber. Issue 4 (24th January 2022)

• Record Type: Journal Article
• Authors: Gao, Shou‐Fei; Wang, Ying‐Ying; Belli, Federico; Brahms, Christian; Wang, Pu; Travers, John C.
• Is Part Of: Laser & photonics reviews. Volume 16:Issue 4(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-01-24
• Subjects: hollow‐core fibers -- nonlinear fiber optics -- optical fibers -- stimulated Raman scattering -- supercontinuum; Lasers -- Periodicals; Photonics -- Periodicals; Lasers -- Périodiques; Photonique -- Périodiques; 621.36
• DOI: 10.1002/lpor.202100426
• Languages: English
• ISSNs: 1863-8880

Abstract

Abstract: A route to supercontinuum generation in gas‐filled hollow‐core anti‐resonant fibers is demonstrated through the creation of a broad vibrational Raman frequency comb followed by continuous broadening and merging of the comb lines through either rotational Raman scattering or the optical Kerr effect. The demonstration experiments, utilizing a single pump pulse with 20 ps duration at 532 nm in a nitrogen‐filled fiber, produce a supercontinuum spanning from 440 to 1200 nm, with an additional deep ultraviolet continuum from 250 to 360 nm. Numerical results suggest that this approach can produce even broader supercontinuum spectra extending from the ultraviolet to mid‐infrared. Abstract : By driving the vibrational response of light molecules confined inside a micro‐structured hollow‐core fiber with picosecond duration laser pulses, a discrete frequency comb of spectral lines is initially created. Upon further propagation through the fiber the lines broaden and merge to form a smooth and continuous optical spectrum spanning from the ultraviolet to mid‐infrared: an ultra‐broadband white‐light supercontinuum.