Hannover 2016 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 60: Laser Applications I
Q 60.7: Talk
Friday, March 4, 2016, 12:30–12:45, a310
Measurement of the nonlinear refractive index of noble gases — Andreas Blumenstein1, Milutin Kovacev2, Uwe Morgner2,3, Peter Simon1, and •Tamas Nagy1,2 — 1Laser-Laboratorium Göttingen e.V., Hans-Adolf-Krebs-Weg 1, 37077 Göttingen — 2Leibniz Universität Hannover, Welfengarten 1, 30167 Hannover — 3Laser Zentrum Hannover e.V., Hollerithallee 8, 30419 Hannover
The nonlinear refractive index of rare gases were measured with high precision by characterizing the spectral broadening of short laser pulses during propagation in a long hollow waveguide. In this way two common problems of nonlinearity measurements could be overcome: the precise determination of the actual light intensity and the accumulation of sufficiently large nonlinearity by using a well-defined geometry and large interaction length. As a result, reliable values could be extracted also for helium and neon which are notoriously difficult to measure due to their very low nonlinearity.