Steep-Edge Longpass Filters

Our steep-edge long pass filters employ magnetron sputtered hard oxide coatings to yield deep rejection and a sharp transition to very high transmission. The coatings are deposited on precision polished Fused Silica substrates, and do not employ any absorbing filter glasses, making them suitable for high-temperature applications. They are offered in three standard sizes, with custom sizes available on request.

Useful for redirecting a particular band of light
Provide very steep (≤1%) cut-on slopes
Suitable for high-temperature applications
Can be cut or machined to smaller sizes
General Specifications
Thickness1.5±0.25 mm
Size Tolerance+0.0/-0.2 mm
Min. Clear Aperature85% of outside dimension
Substrate MaterialUV Grade Fused Silica
Flatness≤1/4 wave/inch TWF
Surface Quality60-40 per MIL-C-48497A
Humidity and AbrasionPer MIL-C-675A
DurabilityPer MIL-C-48497A
Operating Temperature-50 °C to +200 °C
Transmission≥91% average
Rejection≥OD 4.0
Cut-on Slope1% maximum
Cut-on Tolerance±1%
Optional: Mounted in threaded ring - contact our expert on the right for thread sizes

All filters are available in 12,5 mm Ø, 25 mm Ø, 50 mm Ø and 50 mm SQ

50% PointRejection BandTransmission BandPart Number
325 nm200-315 nm335-660 nm325SC01
350 nm200-340 nm360-700 nm350SC01
375 nm200-365 nm385-750 nm375SC01
400 nm200-390 nm408-800 nm400SC01
450 nm200-440 nm458-900 nm450SC01
500 nm200-490 nm508-1000 nm500SC01
550 nm200-539 nm560-1100 nm550SC01
600 nm200-588 nm610-1200 nm600SC01
650 nm200-637 nm660-1300 nm650SC01
700 nm200-686 nm710-1400 nm700SC01
Color Enhancement and Combining
Laser studies


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+90 532 3205241
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