Steep-Edge Longpass Filters

Steep-Edge Longpass Filters

Steep-Edge Longpass Filters

Steep-Edge Longpass filters represent Andover's premium solution for applications requiring exceptional spectral discrimination and sharp wavelength transitions.
These filters utilize advanced magnetron sputtered hard oxide coatings on precision-polished UV Grade Fused Silica substrates to achieve industry-leading cut-on slopes of ≤1%.
Unlike conventional edge filters, these components deliver extremely sharp transitions from deep rejection to high transmission without using any absorbing filter glass, enabling operation at elevated temperatures and in demanding environments.
  • Ultra-steep transition slopes (≤1%)
  • Exceptional transmission (≥91% average)
  • Deep rejection (≥OD 4.0)
  • High-temperature capability (-50°C to +200°C)
  • Precision wavelength control (±1% cut-on tolerance)
  • Hard, durable coating structure
  • No absorbing filter glass
  • Customizable dimensions
  • Can be machined to smaller sizes
  • Superior wavefront quality
  • Fluorescence microscopy and imaging
  • Laser line cleanup
  • Raman spectroscopy
  • Photometry systems
  • Color enhancement
  • Beam combining
  • Spectral analysis
  • High-temperature environments
  • Precision optical systems
  • Thickness: 1.5 ± 0.25mm
  • Size Tolerance: +0.0mm/-0.2mm
  • Clear Aperture: 95% of outside dimension
  • Substrate: UV Grade Fused Silica
  • Flatness: ≤1/4 wave/inch TWF
  • Surface Quality: 60-40 per MIL-C-48497A
  • Operating Temperature: -50°C to +200°C
  • Transmission: ≥91% average
  • Rejection: ≥OD 4.0
  • Cut-on Slope: 1% (2% for 325nm filter)
  • Cut-on Tolerance: ±1%
  • Effective Refractive Index: 1.76
  • Available unmounted or in threaded rings
Steep Longpass Graph
Steep Longpass Graph two

Showing 1–16 of 38 results

    PART NO.
    DESCRIPTION
    1 - 5 pcs.
    6 - 10 pcs.
    > 10 pcs.
    Stock Status

    325SC01-12.5

    325nm Steep-Edge Long Pass Filter, 12.5mm dia.

    $104.00
    $87.00
    $74.00
    In Stock: 38

    325SC01-25

    325nm Steep-Edge Long Pass Filter, 25mm dia.

    $174.00
    $146.00
    $124.00
    In Stock: 19

    325SC01-50

    325nm Steep-Edge Long Pass Filter, 50mm dia.

    $330.00
    $277.00
    $234.00
    In Stock: 2

    325SC01-50S

    325nm Steep-Edge Long Pass Filter, 50.0 x 50.0mm sq.

    $514.00
    $432.00
    $365.00
    In Stock: 2

    350SC01-25

    350nm Steep-Edge Long Pass Filter, 25mm dia.

    $174.00
    $146.00
    $124.00
    In Stock: 7

    350SC01-50

    350nm Steep-Edge Long Pass Filter, 50mm dia.

    $330.00
    $277.00
    $234.00
    In Stock: 7

    350SC01-50S

    350nm Steep-Edge Long Pass Filter, 50.0 x 50.0mm sq.

    $514.00
    $432.00
    $365.00
    In Stock: 2

    375SC01-25

    375nm Steep-Edge Long Pass Filter, 25mm dia.

    $174.00
    $146.00
    $124.00
    In Stock: 15

    375SC01-50

    375nm Steep-Edge Long Pass Filter, 50mm dia.

    $330.00
    $277.00
    $234.00
    In Stock: 2

    375SC01-50S

    375nm Steep-Edge Long Pass Filter, 50.0 x 50.0mm sq.

    $514.00
    $432.00
    $365.00
    In Stock: 1

    400SC01-12.5

    400nm Steep-Edge Long Pass Filter, 12.5mm dia.

    $104.00
    $87.00
    $74.00
    In Stock: 6

    400SC01-25

    400nm Steep-Edge Long Pass Filter, 25mm dia.

    $174.00
    $146.00
    $124.00
    In Stock: 11

    400SC01-50

    400nm Steep-Edge Long Pass Filter, 50mm dia.

    $330.00
    $277.00
    $234.00
    In Stock: 5

    400SC01-50S

    400nm Steep-Edge Long Pass Filter, 50.0 x 50.0mm sq.

    $514.00
    $432.00
    $365.00
    In Stock: 0

    450SC01-12.5

    450nm Steep-Edge Long Pass Filter, 12.5mm dia.

    $104.00
    $87.00
    $74.00
    In Stock: 11

    450SC01-25

    450nm Steep-Edge Long Pass Filter, 25mm dia.

    $174.00
    $146.00
    $124.00
    In Stock: 6