Journal
OPTICS EXPRESS
Volume 20, Issue 11, Pages 12004-12013Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.20.012004
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- German Federal Ministry of Education and Research (BMBF) [13N10773]
- Carl-Zeiss-Stiftung
- German Academic Exchange Service (DAAD)
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We present a fiber-based laser source for multiplex coherent anti-Stokes Raman scattering (CARS) microscopy. This source is very compact and potentially alignment-free. The corresponding pump and Stokes pulses for the CARS process are generated by degenerate four-wave mixing (FWM) in photonic-crystal fibers. In addition, an ytterbium-doped fiber laser emitting spectrally narrow 100 ps pulses at 1035 nm wavelength serves as pump for the FWM frequency conversion. The FWM process delivers narrow-band pulses at 648 nm and drives a continuum-like spectrum ranging from 700 to 820 nm. With the presented source vibrational resonances with energies between 1200 cm(-1) and 3200 cm(-1) can be accessed with a resolution of 10 cm(-1). Additionally, the temporal characteristics of the FWM output have been investigated by a cross-correlation setup, revealing the suitability of the emitted pulses for CARS microscopy. This work marks a significant step towards a simple and powerful all-fiber, maintenance-free multiplex-CARS source for real-world applications outside a laboratory environment. (c) 2012 Optical Society of America
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