Unser Partner Andover Corp.

Steep-edge longpass filters

from Andover

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
Thickness 1.5±0.25 mm
Size Tolerance +0.0/-0.2 mm
Min. Clear Aperature 85% of outside dimension
Substrate Material UV Grade Fused Silica
Flatness ≤1/4 wave/inch TWF
Surface Quality 60-40 per MIL-C-48497A
Humidity and Abrasion Per MIL-C-675A
Durability Per MIL-C-48497A
Operating Temperature -50 °C to +200 °C
Transmission ≥91% average
Rejection ≥OD 4.0
Cut-on Slope 1% maximum
Cut-on Tolerance ±1%
Mechanical Unmounted
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% Point Rejection Band Transmission Band Part Number
325 nm 200-315 nm 335-660 nm 325SC01
350 nm 200-340 nm 360-700 nm 350SC01
375 nm 200-365 nm 385-750 nm 375SC01
400 nm 200-390 nm 408-800 nm 400SC01
450 nm 200-440 nm 458-900 nm 450SC01
500 nm 200-490 nm 508-1000 nm 500SC01
550 nm 200-539 nm 560-1100 nm 550SC01
600 nm 200-588 nm 610-1200 nm 600SC01
650 nm 200-637 nm 660-1300 nm 650SC01
700 nm 200-686 nm 710-1400 nm 700SC01


Color Enhancement and Combining
Laser studies


Jörg Tobisch
Jörg Tobisch


Quantum Design GmbH

Im Tiefen See 58
64293 Darmstadt

Telefon:+49 6151 8806-0
Fax:+49 6151 8806920
Jörg TobischProdukt Manager - Optik
+49 6151 8806-50
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