Avoidance of cross-phase modulation in femtosecond stimulated Raman scattering

Thomas Würthwein, Niels Irwin, Carsten Fallnich

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

Abstract

Raman scattering has become a powerful method in analytic spectroscopy and label-free imaging to study the chemical composition of a sample. Especially coherent Raman scattering (CRS) techniques such as stimulated Raman scattering (SRS) and coherent anti-Stokes Raman scattering (CARS) are developed further and show a great potential, due to their amplified signal in comparison to spontaneous Raman scattering. In CRS the interaction of light pulses with molecular vibrations are investigated, typically resulting in a characteristic molecular spectrum. However, especially CARS spectra are effected by the non-resonant contribution to the Raman scattering signal, resulting in a non-specific background and a distortion of the lineshape. SRS is free of a non-resonant background but is affected by two-photon absorption, cross-phase modulation (XPM) [1], and thermal scattering (temperature-induced refractive index change) [2]. The resulting artefacts in SRS become relevant for high pulses energies and ultra-short pulses. One example, where high pulse energies and ultra-short pulses are needed, is the field of spatial resolution enhancement in CRS. All techniques to overcome the diffraction limit by Abbe are based on depleting one of the scattering resources, as for example the pump or probe photons [3]. High pulse energies in the order of up to 200-300 nJ are needed, leading to also unwanted spectral distortions through XPM [4].

Original languageEnglish
Title of host publication2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)
Place of PublicationPiscataway, NJ
PublisherIEEE
Number of pages1
ISBN (Electronic)978-1-7281-0469-0
ISBN (Print)978-1-7281-0470-6
DOIs
Publication statusPublished - Jun 2019
EventConference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference, CLEO/Europe-EQEC 2019 - Munich Trade Fair Centre, Munich, Germany
Duration: 23 Jun 201927 Jun 2019
http://www.cleoeurope.org

Conference

ConferenceConference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference, CLEO/Europe-EQEC 2019
Abbreviated titleCLEO/Europe-EQEC 2019
CountryGermany
CityMunich
Period23/06/1927/06/19
Internet address

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