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Harmonic Beamsplitters with Low Dispersion for Ti:Sapphire Wavelengths
Our harmonic beamsplitters separate
Ø1" Round Substrate
Elliptical Substrate with
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 laser. Each optic features a coating designed for high reflectance of s-polarized light in the 360 to 440 nm wavelength range and low reflectance of p-polarized light in the 700 to 900 nm wavelength range. The coating is designed for use at a 56° angle of incidence (AOI) to minimize the reflectance of the fundamental component. These beamsplitters are ideal for Ti:Sapphire 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 UV fused silica substrate, while the other surface is uncoated. The edge of the round substrate (Item # UBS20) is engraved with the item # and an arrow indicating the coated side of the beamsplitter. The coated side of the elliptical variant (Item # UBS21) 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 below.
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POLARIS-B1S Flexure-Clamp Mount
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Thorlabs offers a wide selection of optics optimized for use with femtosecond laser pulses. Please see below for more information.