This article is part of the Journal of Raman Spectroscopy special issue entitled “Proceedings of the 9th European Conference on Nonlinear Optical Spectroscopy (ECONOS), Bremen, Germany, June 21–23, 2010” edited by Peter Radi, PSI, Villigen, Switzerland, and Arnulf Materny, Jacobs University, Bremen, Germany.
Origin of spectral interferences in femtosecond stimulated Raman microscopy†
Article first published online: 25 MAR 2011
Copyright © 2011 John Wiley & Sons, Ltd.
Journal of Raman Spectroscopy
Volume 42, Issue 10, pages 1875–1882, October 2011
How to Cite
Ploetz, E., Marx, B. and Gilch, P. (2011), Origin of spectral interferences in femtosecond stimulated Raman microscopy. J. Raman Spectrosc., 42: 1875–1882. doi: 10.1002/jrs.2884
- Issue published online: 24 OCT 2011
- Article first published online: 25 MAR 2011
- Manuscript Accepted: 6 DEC 2010
- Manuscript Received: 22 SEP 2010
- Raman microscopy;
- stimulated Raman scattering;
- femtosecond laser pulses;
- four-wave mixing
In femtosecond stimulated Raman microscopy (FSRM), a spectrally narrow (Raman pump) pulse and a broad (Raman probe) laser pulse are employed to generate the Raman spectra of microscopic objects. The resulting spectra exhibit, in addition to the Raman bands, spectral modulations of comparable amplitude. Here a model is devised that attributes these modulations to a four-wave mixing (FWM) process. Two light fields of the probe pulse and one field of the pump pulse serve as input fields. The resulting FWM field experiences a heterodyne amplification by the probe field. Simulations based on this model reproduce the appearance of the spectral modulations. Furthermore, the amplitude of the modulations exhibits dependences on the energies of pump and probe pulses as well as on the nonlinear refractive index n2, which are in line with the model. Copyright © 2011 John Wiley & Sons, Ltd.