Mainz 2017 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 6: Time-resolved spectroscopy

A 6.4: Vortrag

Montag, 6. März 2017, 18:15–18:30, HS 20

Laser-induced grating spectroscopy with absolute time information — •Jan Reislöhner, Christoph G. Leithold, and Adrian N. Pfeiffer — Institute of Optics and Quantum Electronics, Abbe Center of Photonics, Friedrich Schiller University, Max-Wien-Platz 1, 07743 Jena

The nonlinear response function of transparent dielectrics is studied in time and spectral domain. A laser-induced grating is generated in a thin sample with short laser pulses (~5 fs, 700 nm) and imaged with a 2f-2f imaging system. The individual beams (the two fundamental beams and two orders of self-diffraction) are blocked consecutively in the imaging system while varying the pulse delay. From the absolute phase of the interference gratings, the delay between the fundamental pulses and the nonlinear optical response can be determined with subcycle precision. However, the optical path difference in the optical system is usually not known and inhibits the measurement of the absolute grating phase.

In a first step, the information contained in relative phase measurements (intensity dependence, material dependence) is examined. In a second step, a method is discussed for retrieving the absolute grating phase by stepwise translation and rotation of each element of the optical system.