Two-color suppression of stimulated Raman scattering

Thomas Würthwein, Niels Irwin, Carsten Fallnich

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

Abstract

Sub-diffraction limited imaging schemes have become widely used in fluorescence microscopy [1]. However, the need for labeling with fluorescent dyes remains a major downside of fluorescence microscopy. The size, availability, toxicity as well as photo-bleaching of the used dyes can complicate measurements [2]. In contrast, Raman imaging is inherently label-free. Unfortunately, the super-resolution schemes used in fluorescence microscopy are currently not transferable to Raman microscopy. This paper presents the development of a scheme for the suppression of coherent Raman scattering through the depletion of probe photons, inspired by the work of M. Cho et al. [3, 4], who showed the suppression of coherent Raman scattering using laser pulses at three different wavelengths and two Raman resonances. In our case, probe depletion is achieved through saturated stimulated Raman scattering in a three-beam setup with only two colors involved. Fig. 1 (a) describes the working principle: in the unsuppressed case, the combination of pump and probe pulse induces stimulated Raman scattering at the Raman resonances, leading to stimulated Raman loss (SRL) of the probe and and stimulated Raman gain (SRG) of the pump. The Raman spectrum then results from the difference between two spectra, recorded with pump on and off, respectively. In the suppressed case a second strong pump pulse, working as a depletion pulse, depletes the probe pulse via stimulated Raman scattering (SRLD) and induces a shortage of the probe photons at the Raman resonances, saturating the stimulated Raman scattering. Thus, only a small amount of additional SRLSup is induced by the original pump. If SRL is detected in addition to the spectral change, induced by the depletion pulse, the SRL will be reduced resulting in SRLSup < SRL.

Original languageEnglish
Title of host publication2019 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2019
PublisherIEEE
ISBN (Electronic)9781728104690
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

Publication series

Name2019 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2019

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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