Hannover 2013 – scientific programme

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MO: Fachverband Molekülphysik

MO 7: Femtosecond Spectroscopy I: Electronic 2D Spectroscopy (contributed for SYED in MO)

MO 7.5: Talk

Monday, March 18, 2013, 17:30–17:45, F 102

New multi-channel detection for Femtosecond Stimulated Raman Microscopy — •Lars Czerwinski, Benjamin Marx, and Peter Gilch — Institut für Physikalische Chemie, HHU Düsseldorf, Universitätsstr. 1, 40225 Düsseldorf

A couple of years ago we have introduced femtosecond stimulated Raman spectroscopy into microscopy[1,2]. As conventional Raman microscopy femtosecond stimulated Raman microscopy (FSRM) yields spectra for each pixel of the micrograph. Our system for the FSRM consist of a fiber laser amplifier for a picosecond pulse (Raman pump) and Ti:Sa oscillator for a femtosecond pulse (Raman probe). At the focus of the microscope stimulated Raman scattering occurs. Chemical entities in the sample are identified via the spectral signature of the process. The transmitted probe light is fed into a spectrograph and recorded by a multi-channel detector. The requirements for the detector are high. It ought to feature about 500 pixels to allow for a reasonable spectral resolution as well as complete spectral coverage. The aim is to record a complete Raman spectrum simultaneously for each focal point in a millisecond or below. The new 20 kHz detector will be presented and compared with the previous detection system.

[1] E. Ploetz, S. Laimgruber, S. Berner, W. Zinth, P. Gilch, Appl. Phys. B 87, 389-393 (2007), [2] E. Ploetz, B. Marx, T. Klein, R. Huber, P. Gilch, Opt. Express 17 18612-20 (2009)