Longpass Filter, Colored-Glass Alternative, 2x2 in., 420 nm Cut-on

Square Colored Glass Alternative Longpass Filters

The 20CGA-420 Colored-Glass Alternative Filter is a 2 inch (50.8 mm) square long-pass filter with a 420 ± 5 nm cut-on wavelength. Colored-Glass Alternative filters have a steep transition between the region of transmission and rejection (blocking) that is much steeper than colored glass filters. Colored-Glass Alternative filters have out-of-band rejection ≥OD 5 to 200 nm. Typical transmission is ≥90% average.

Specifications

Technical Specs

Type
Colored Glass Alternative Longpass Filter
Optic Size
50.8 x 50.8 mm
Cut-on Wavelength
420 nm
Cut-on Wavelength Tolerance
±5 nm
Effective Index of Refraction
1.86
Surface Quality
80-50 scratch-dig
Thickness
1.1 mm
Thickness Tolerance
±0.1 mm

Size Tolerance
±0.25 mm
Clear Aperture
≥90% of filter size with film-to-the-edge
Temperature Range
-100 to 400°C
Humidity Resistance
MIL-STD-810, Method 507.3, Procedure III, Modified to 40 cycles
Abrasion, Adhesion, Hardness
MIL-C-48497
Cleaning
See How to Clean Optics

Type
Colored Glass Alternative Longpass Filter
Optic Size
50.8 x 50.8 mm
Cut-on Wavelength
420 nm
Cut-on Wavelength Tolerance
±5 nm
Effective Index of Refraction
1.86
Surface Quality
80-50 scratch-dig
Thickness
1.1 mm
Thickness Tolerance
±0.1 mm

Size Tolerance
±0.25 mm
Clear Aperture
≥90% of filter size with film-to-the-edge
Temperature Range
-100 to 400°C
Humidity Resistance
MIL-STD-810, Method 507.3, Procedure III, Modified to 40 cycles
Abrasion, Adhesion, Hardness
MIL-C-48497
Cleaning
See How to Clean Optics