P. Hansinger,
P. Töpfer,
N. Dimitrov,
D. Adolph,
D. Hoff,
T. Rathje,
A. M. Sayler,
A. Dreischuh,
and G.G. Paulus
Refractive index dispersion measurement using carrier-envelope phasemeters
New J. Phys., 19 :023040 (February 2017)
Refractive index dispersion measurement using carrier-envelope phasemeters
New J. Phys., 19 :023040 (February 2017)
Abstract:
We introduce a novel method for direct and accurate measurement of refractive index dispersion based on carrier-envelope phase detection of few-cycle laser pulses, exploiting the difference between phase and group velocity in a dispersive medium. In a layout similar to an interferometer, two carrier-envelope phasemeters are capable of measuring the dispersion of a transparent or reflective sample, where one phasemeter serves as the reference and the other records the influence of the sample. Here we report on proof-of-principle measurements that already reach relative uncertainties of a few 10^−4 . Further development is expected to allow for unprecedented precision.