Stuttgart 2012 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 54: Poster 3
Q 54.19: Poster
Thursday, March 15, 2012, 16:30–19:00, Poster.I+II
VUV generation in a hollow core fiber — •Andreas Koglbauer1,2, Thomas Diehl1,2, Daniel Kolbe1,2, Matthias Sattler1,2, Matthias Stappel1,2, Ruth Steinborn1,2, and Jochen Walz1,2 — 1Johannes Gutenberg-Universität, D-55099 Mainz — 2Helmholtz-Institut Mainz, D-55128 Mainz
Non-degenerate four-wave mixing (FWM) in metal vapors is a well-established method for the generation of cw vacuum ultraviolet (VUV) radiation, such as Lyman-α-light (121.56 nm), the cooling transition in (anti-)hydrogen. Utilizing resonances of the nonlinear medium (mercury) enabled the highest mixing-efficiencies so far [1]. Nevertheless the achievable output power is in the nW regime.
Using focused beams, the interaction region is in the order of the confocal parameter (∼1 mm). One possibility to further enhance the efficiency is to elongate this region. This can be accomplished by confining the light in a vapor filled hollow core fiber, which can have a length of several cm.
We present a study of possible phase-matching scenarios with the associated VUV efficiencies, considering dispersion and losses due to the medium as well as the fiber. The phase-matching temperature is smaller, compared to the mixing with focused beams. This allows for the FWM between Hg isotopes, promising a gain of more than three orders of magnitude in the nonlinear susceptibility. Generation of Hg vapor within the fiber is demonstrated via absorption spectroscopy on the 61S−63P transition in Hg transverse through the fiber.
[1] Can. J. Phys. 89(1), 25-28 (2011)