This product is a Thin Beam Splitter, specifically designed for use with 635nm lasers, offered by the vendor Semrock. Polarizing Beamsplitters are often used in semiconductor or photonics instrumentation to transmit p-polarized light while reflecting s-polarized light. Common applications include polarization control in. Notice: Above specifications are tested at center wavelength without connector in room temperature @23 ℃. For devices with connectors, IL will be 0. 3dB higher, RL will be 5dB lower, ER will be 2dB lower, slow axis is default aligned to the connector key. a laser beam) into two (or sometimes more) beams, which may or may not have the same optical power (radiant flux).