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Harmonic Beamsplitter with Low Dispersion for Ti:Sapphire Wavelengths
Harmonic Beamsplitter Separates
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Thorlabs' UBS20 Ultrafast Harmonic Beamsplitter, also known as a harmonic separator, is designed to separate the fundamental and second harmonic of light from an ultrafast, Ti:Sapphire laser. It features a coating designed for high reflectance of s-polarized light in the 360 - 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. This beamsplitter is 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 the front surface of the UV fused silica substrate, while the back surface is uncoated. The edge of the substrate is engraved with the part number and an arrow indicating the coated side of the beamsplitter, as illustrated in the diagram above.
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Thorlabs offers a wide selection of optics optimized for use with femtosecond laser pulses. Please see below for more information.