Thorlabs FGUV11S Bandpass Filter

Thorlabs FGUV11S is a 2-inch × 2-inch square UV-passing bandpass optical filter made from UG11 colored glass. It’s designed to transmit ultraviolet (UV) light in a specific band while blocking other wavelengths, making it useful in optical systems that require UV selection or isolation.

🧪 Key Specifications

• Filter Type: Bandpass optical filter (colored glass)

• Material: Schott UG11 colored glass substrate

• Size/Shape:

  • 2″ × 2″ square

  • Thickness typically ~2 mm (standard for these colored glass filters)

• Wavelength Range: ~275 nm to 375 nm (UV band)

• Transmission: Passes ultraviolet wavelengths in that range and blocks visible/IR outside it (typical of UG11 filters)

• Surface Quality: Often ~40-20 scratch-dig (typical for colored glass filters)

🧰 Typical Applications

• UV imaging and sensing

• Bandpass filtering in UV optical systems

• Excitation filters in fluorescence microscopy or spectroscopy

• Laser optics (selecting specific UV wavelengths)