Thorlabs FEL1300 Longpass Optical Filter

The Thorlabs FEL1300 is a precision Ø1″ (25 mm) long-pass optical filter designed to transmit wavelengths above approximately 1300 nm while blocking shorter wavelengths. It is part of Thorlabs’ edgepass filter family commonly used in photometry, stray light suppression, Raman spectroscopy, and near-infrared optical systems. These filters feature durable dielectric coatings that provide reliable transmission characteristics and withstand typical handling and cleaning in laboratory environments.

• Filter Type: Long-pass edge filter

• Cut-On Wavelength: ~1300 nm

• Diameter: Approximately Ø1″ (25.0 mm)

• Application: Optical systems needing suppression of shorter wavelengths and transmission in the NIR region

• Features: Dielectric interference coating, robust optical quality for research & industrial use