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Harmonic Beamsplitters with Low Group Delay Dispersion
Our harmonic beamsplitters separate the fundamental and second harmonic of Ti:Sapphire or Yb lasers (not to scale).
Ø1", Reflects 500 - 550 nm,
25 mm Elliptical,
Click to Enlarge
POLARIS-B1S Flexure-Clamp Mount
Thorlabs' ultrafast harmonic beamsplitters, also known as harmonic separators, are designed to separate the fundamental and second harmonic of light from an ultrafast Ti:Sapphire or ytterbium laser. Each optic features a coating designed for high reflectance of s-polarized light in the second harmonic wavelength range and low reflectance of p-polarized light in the fundamental wavelength range. The coatings are designed for use at a 56° angle of incidence (AOI) to minimize the reflectance of the fundamental component, though they may also be used at 45° with diminished performance. These beamsplitters are ideal for femtosecond pulsed lasers where pulse broadening is a concern by offering less than 20 fs2 absolute GDD.
The beamsplitter coating is applied to one surface of the substrate, while the other surface is uncoated. The edge of each round substrate (item #s UBS20 and UBS24) is engraved with the item # and an arrow indicating the coated side of the beamsplitter. The coated side of the elliptical UBS21 beamsplitter may be determined through visual inspection.
These beamsplitters are offered in round or elliptical variants. The elliptical substrate offers a larger clear aperture than the round substrate when mounted at 56° AOI. We recommend mounting Ø1" round beamsplitters in our POLARIS-B1G or POLARIS-B1S Polaris Mounts. For mounting 25 mm elliptical beamsplitters, we offer the BW25M Brewster's Angle Mount. Please refer to the photos above.
Click here for measured data.
Click here for theoretical data.
Thorlabs offers a wide selection of optics optimized for use with femtosecond and picosecond laser pulses. Please see below for more information.