Combining or separating Laser Beams

LaserMUX™ filters are designed to efficiently combine or separate multiple laser beams at a 45° angle of incidence. These dichroic laser beam combiners are optimized to multiplex (MUX) popular laser lines, and can also be used in reverse to demultiplex (DEMUX). The ultralow-autofluorescence filters are ideally suited for OEM multi-laser fluorescence imaging and measurement applications…

Surface-enhanced Raman Scattering

Raman signals are inherently weak, especially when using visible light excitation and so a low number of scattered photons are available for detection. One method to amplify weak Raman signals is to employ surface-enhanced Raman scattering (SERS). SERS uses nanoscale roughened metal surfaces typically made of gold (Au) or silver (Ag). Laser excitation of these…

Coherent anti-Stokes Raman Scattering

Coherent anti-Stokes Raman scattering (CARS) is a nonlinear four-wave mixing process that is used to enhance the weak (spontaneous) Raman signal. In the CARS process a pump laser beam (at frequency ωpump) and a Stokes laser beam (at ωStokes) interact, producing an anti-Stokes signal at frequency ωCARS = 2ωpump – ωStokes. The Stokes beam (ωStokes)…