Dresden 2011 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 29: Laserentwicklung: Nichtlineare Effekte 1
Q 29.3: Vortrag
Mittwoch, 16. März 2011, 11:00–11:15, SCH 251
A Widely tunable XUV frequency comb source — •Dominik Z. Kandula2, Tjeerd J. Pinkert1, Christoph Gohle3, Itan Barmes1, Jonas Morgenweg1, Wim Ubachs1, and Kjeld S.E. Eikema1 — 1LaserLaB Amsterdam, Institute for Lasers Life and Biophotonics, Vrije Universiteit, De Boelelaan 1081, 1081HV Amsterdam, The Netherlands — 2Max Born Institute, Max-Born Str. 2A, 12489 Berlin, Germany — 3Ludwig-Maximilians-Universität, Schellingstrasse 4, 80799 München, Germany
A frequency comb in the extreme ultraviolet (XUV) spectral range is produced by means of high harmonic upconversion of two phase-locked infrared pulses. The IR-pulse pair originates from a frequency comb oscillator and is amplified to energies in the order of several mJ per pulse in a noncollinear optical parametric chirped pulse amplifier. The amplification scheme allows to select the wavelength and the bandwidth of the amplified IR-pulses in the range between 700nm and 1000nm. This enables to cover the entire spectral range from the 5th harmonic at 200nm, to at least the 15th harmonic at 50nm with the upconverted frequency comb.
The versatility of the system is demonstrated by recording direct frequency comb excitation signals in helium, neon and argon with visibilities of up to 62%, at wavelengths from 51.5 nm to 83.5 nm. Using the XUV frequency comb a new ground state energy of helium could be measured with 6 MHz accuracy, presenting the most accurate direct frequency measurement in the XUV to date.