Fiber laser-based light source for CARS microspectroscopy

Esben-Ravn Andresen; Carsten-Krogh Nielsen; Jan Thøgersen; Søren-Rud Keiding

doi:10.1117/12.728382

13 July 2007 Fiber laser-based light source for CARS microspectroscopy

Esben-Ravn Andresen, Carsten-Krogh Nielsen, Jan Thøgersen, Søren-Rud Keiding

Proceedings Volume 6630, Confocal, Multiphoton, and Nonlinear Microscopic Imaging III; 663016 (2007) https://doi.org/10.1117/12.728382
Event: European Conferences on Biomedical Optics, 2007, Munich, Germany

Abstract

We demonstrate an alternative light source for CARS microspectroscopy based on a fiber laser and a photonic crystal fiber. The light source simultaneously delivers a picosecond pump pulse at 1033.5 nm and a frequency shifted femtosecond Stokes pulse, tunable from 1033.5 nm to 1400 nm. This corresponds to a range 0 - 2500 cm^-1, so that Raman-active vibrations in this frequency range can be probed. The spectral resolution is 5 cm^-1, given by the spectral width of the pump pulse. The frequency range that can be probed simultaneously is 200 cm^-1-wide, given by the spectral width of the Stokes pulse. The achievable average powers are 50 mW for the pump and 2 mW for the Stokes pulse. The repetition rate is 35 MHz. We demonstrate the capability of this light source by performing CARS microspectroscopy and comparing CARS spectra with Raman spectra.

Citation Download Citation

Esben-Ravn Andresen, Carsten-Krogh Nielsen, Jan Thøgersen, and Søren-Rud Keiding "Fiber laser-based light source for CARS microspectroscopy", Proc. SPIE 6630, Confocal, Multiphoton, and Nonlinear Microscopic Imaging III, 663016 (13 July 2007); https://doi.org/10.1117/12.728382

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