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Ultra-compact tunable fiber laser for coherent anti-Stokes Raman imaging

: Gottschall, T.; Meyer-Zedler, T.; Schmitt, M.; Huber, R.; Popp, J.; Tünnermann, A.; Limpert, J.

Volltext ()

Journal of Raman Spectroscopy 52 (2021), Nr.9, S.1561-1568
ISSN: 0377-0486
ISSN: 1097-4555
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer IOF ()

This work describes the construction of an ultra-compact narrowband fiber laser source for coherent anti-Stokes Raman scattering microscopy of Raman tags, that is, for addressing Raman resonances of deuterated molecules and alkyne tags in the spectral range from 2080 to 2220 cm−1. A narrowband and fast electronically tunable cw seed source based on a semiconductor optical amplifier (SOA) emitting around 1335 nm has been employed to seed four-wave mixing (FWM) in an endlessly single mode fiber (ESM) pumped by a ps pulse duration Yb-fiber laser. A conversion efficiency of 50% is demonstrated. This compact fiber optical parametric amplifier (FOPA) has been used to perform coherent anti-Stokes Raman imaging experiments of crystalline deuterated palmitic acid.