Thorlabs FEL1200 Longpass Optical Filter

Thorlabs FEL1200 Ø1″ Soft-Coated Longpass Filter – 1200 nm Cut-On
The Thorlabs FEL1200 is a Ø1″ soft-coated longpass optical filter designed to transmit wavelengths above approximately 1200 nm while strongly attenuating shorter wavelengths. The filter uses a durable dielectric coating on a soda-lime glass substrate, making it suitable for general near-infrared spectral isolation, optical setups, and spectroscopy applications. It features a clear aperture of ~25.4 mm and is mounted in a robust ring for easy handling and integration into standard optical mounts and filter wheels.

Key Features

• Ø1″ longpass optical filter with 1200 nm cut-on wavelength

• Soft-coated dielectric design for reliable spectral performance

• Mounted in a protective ring for easy handling

• Ideal for NIR spectral isolation, optical experiment setups, and filtering stray light