These thin film polarizers have been designed to provide superior performance in ultrafast Ti:Sapphire regenerative amplifiers. While pulse lengths are relatively long in these amplifiers, pulse dispersion is still a concern if pulse width is to be maintained in the recompressed pulse. Multiple round trips in the amplifier have a multiplying effect on the dispersive characteristics of any optic in the cavity. For this reason, substantial effort has been made in designing and testing these polarizers for minimum pulse dispersion.
Two versions are offered: the UP.25 provides maximum bandwidth and laser damage resistance, while the UP.26 provides maximum polarization extinction. The UP.25 coating has a bandwidth of 700–900 nm and a polarization extinction of 5:1. This design also tends to support higher laser energy density. The UP.26 coating features a polarization extinction of 95:1 over a bandwidth of 785–815 nm. Angular tuning may be required to achieve maximum transmission. High-quality BK 7 substrates afford minimal wavefront distortion. These ultrafast polarizers are rectangular, 14.3 x 28.6 x 3.2 mm.
The Low GVD Beamsplitting Polarizers were optical bonded to create epoxy-free optical paths, make it an ideal choice for high power applications with energy density exceeding 10 J/cm² at 1064 nm. Manufactured with Fused Silica with input faces designed to be 12.7 x 12.7 mm, this polarizer offers average transmission near 98% and average extinction ratios greater than 10,000:1. The unique design allows ultra-broadband pulses to travel in and out of the polariers without refraction, avoiding spatial dispersion of the broadband pulse.
