Newport?s WEU-02 Wavelength Extension Unit for Multimodal Imaging

Newport's WEU-02 wavelength extension unit is designed to expand the capability of femtosecond lasers. Through a series of user controls, the WEU-02 can be configured for use in various spectroscopy, imaging, and pump-probe applications. It can also be integrated into two-photon microscope set-ups to add modalities for enhanced imaging capabilities.
The design of the WEU-02 allows the fundamental beam to pass through, preserving the beam path and tuning range of the pump source. A portion of the fundamental can be sent to a photonic crystal fiber (PCF) to be converted to a broadband supercontinuum. This light can then be recombined with the remaining fundamental for use in pump-probe and multimodal spectroscopy and microscopy experiments. This supercontinuum can be used as a Stokes beam to add broadband Coherent Anti-Stokes Raman Scattering (CARS) spectroscopy and microscopy capabilities around 3000 cm-1 in existing setups utilizing two-photon excited fluorescence (TPEF) and second harmonic generation (SHG). User controls include a thumbwheel to either maintain the fundamental for two-photon imaging, or selectively split to add pump-probe and multimodal capability.