High efficiency, low dispersion 50:50 splitting of s- or p-polarization over a 200 nm bandwidth; center wavelengths from 790 to 1550 nm. The high efficiency and excellent durability of these broadband 50:50 beamsplitters makes them superior to partially reflective metal coatings for use in ultrafast laser systems and experiments. With very low loss over a ~200 nm bandwidth and near-linear GDD, they are suitable for use with laser pulse durations > 15 fs.

PulseLine femtosecond beamsplitters are broadband, 50:50 all-dielectric beamsplitters which have been designed with very consistent transmission over a ~200 nm range and ultralow GDD.  These broadband beamsplitters are ideal for use in autocorrelators due to the low impact on the phase characteristics of a short pulse.  They are also used in many types of pump-probe experiments and in the construction of antiresonant ring configurations.  Coated on a 1 mm UV-grade fused silica substrate, they are extremely durable and essentially lossless, with near-linear GDD that is dominated by dispersion in the substrate.  Shown here are transmission and dispersion curves for a beamsplitter designed for s-polarization and 800 nm center wavelength.  Both group delay dispersion and third order dispersion are very low, and GDD is nearly linear.  Similar performance can be achieved for split ratios other than 50:50.  Note that broader bandwidth can be achieved by working with s-polarized light due to the use of dielectric coatings.  
• Near-lossless 50:50 splitting of s- or p-polarized light 
• Low, linear GDD over a ~200 nm bandwidth
• High durability dielectric coating
• Center wavelengths from 790 to 1550 nm from stock; custom wavelengths available upon request