461+689nm, 1/4λ, dia25.4mm, Dual Wavelength Waveplate（QWPZ461+689）

This 461 nm and 689 nm dual-wavelength quarter-wave plate is designed to introduce quarter-wave retardance simultaneously at both 461 nm and 689 nm design wavelengths. It is suitable for dual-wavelength laser and optical measurement systems where the polarization state needs to be adjusted. It helps control polarization state for laser alignment and multi-wavelength polarization-sensitive optical setups using a single optical element. Key specifications: Wavelength / main spec: 461 nm and 689 nm design wavelengths Bandwidth / transition spec: Dual-wavelength quarter-wave retardance at the design wavelengths Transmission / blocking: See specification table for coating and transmission details Format / custom option: 25.4 mm diameter, available unmounted or mounted