We report on the realization of compact UV visible multiline Raman lasers based on two types of hydrogen-filled hollow-core photonic crystal fiber. The first, with a large pitch Kagome lattice structure, offers a broad spectral coverage from near IR through to the much sought after yellow, deep-blue and UV, whereas the other, based on photonic bandgap guidance, presents a pump conversion concentrated in the visible region. The high Raman efficiency achieved through these fibers allows for compact, portable diode-pumped solid-state lasers to be used as pumps. Each discrete component of this laser system exhibits a spectral density several orders of magnitude larger than what is achieved with supercontinuum sources and a narrow line-width, making it an ideal candidate for forensics and biomedical applications.
Wang, Y. Y., Couny, F., Light, P. S., Mangan, B. J., & Benabid, F. (2010). Compact and portable multiline UV and visible Raman lasers in hydrogen-filled HC-PCF. Optics Letters, 35(8), 1127-1129. https://doi.org/10.1364/OL.35.001127