Colored Glass Filter, Coated, Ø25.4 mm, UV Bandpass, U340

visible absorbing bandpass filter model fsr-u340

The FSR-U340-C Visible Absorbing Filter is a 25.4 mm diameter dark glass optical filter that passes UV and absorbs visible wavelengths made of Hoya U-340 filter glass. It is coated for better resistance to humid environments. These filters are precision polished for demanding research or OEM applications and are ideal for extraction of UV wavelengths.

Specifications

Technical Specs

Type
Colored Glass Bandpass Filter
Material
Hoya U340 or equivalent
Center Wavelength
340 nm
Coating Type
SiO₂
Angle of Incidence
0°
Size
Ø25.4 mm
Size Tolerance
±0.3 mm
Thickness
1.9 to 3.1 mm
Thickness Tolerance
±0.1 mm
Surface Flatness
≤1λ at 632.8 nm over the clear aperture

Surface Quality
60-40 scratch-dig
Damage Threshold
30 W/cm² CW, Typical
Wedge
≤3 arc min
Clear Aperture
central ≥ 80% of diameter
Chamfers
Up to 1 mm face width
Chamfers Angle Tolerance
45° ±15°
Cleaning
See How to Clean Optics
Edge Finish
Coated

Type
Colored Glass Bandpass Filter
Material
Hoya U340 or equivalent
Center Wavelength
340 nm
Coating Type
SiO₂
Angle of Incidence
0°
Size
Ø25.4 mm
Size Tolerance
±0.3 mm
Thickness
1.9 to 3.1 mm
Thickness Tolerance
±0.1 mm
Surface Flatness
≤1λ at 632.8 nm over the clear aperture

Surface Quality
60-40 scratch-dig
Damage Threshold
30 W/cm² CW, Typical
Wedge
≤3 arc min
Clear Aperture
central ≥ 80% of diameter
Chamfers
Up to 1 mm face width
Chamfers Angle Tolerance
45° ±15°
Cleaning
See How to Clean Optics
Edge Finish
Coated

Resources & Downloads

Other

FSR-U340-C_ROHS2-2021.pdf(280.6 kB, PDF)

2D Product Drawings

FSR-C Drawing(71.9 kB, PDF)

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