SHORT WAVE PASS EDGE FILTERS
Short-wave pass (SWP) edge filters are designed to transmit shorter wavelengths while blocking longer wavelengths. These filters are ideal for applications requiring high precision and clarity in the shorter wavelength range. Andover’s SWP filters provide a steep transition between transmission and reflection, making them perfect for order sorting in photometry and enhancing color accuracy in various optical systems.
Constructed with durable first-surface dielectric coatings, our SWP filters maintain their performance through regular handling and cleaning. Available in standard increments and customizable upon request, our SWP filters offer versatile solutions for your optical needs.
- Useful for redirecting a particular band of light
- Offers coverage over the 300 - 1000nm range
- Provide steeper transition than color glass filters
- Fluorescence
- Photometry
- Color enhancement and combining
For more demanding requirements, please see our steep-edge long pass filters.
| General Specifications | |
| Thickness: | 4.0mm maximum |
| Size Tolerance: | +0.0mm/-0.5mm |
| Min. Clear Aperture: | 95% of outside dimension |
| Substrate Material: | Soda Lime Glass, Fused Silica (Note: BK-7, Borofloat available option for higher Tx.) |
| Flatness: | 3-5 waves per 25 TWF |
| Surface Quality: | 80-50 per MIL-C-48497A |
| Humidity and Abrasion: | Per MIL-C-675A |
| Operating Temperature: | -50°C to +100°C |
| Cut-on Slope: | 6% maximum (11% for 300nm filter) |
| Cut-on Tolerance: | ±10nm from 400nm-1100nm ±5nm from 300nm - 375nm |
| Mechanical: | Unmounted |
| Transmission | |
| Long Wave Pass: | 85% average from the 50% cut-on point to 2000nm |
| Short Wave Pass: |
400-450nm: 85% avererage from the 50% cut-on point to 0.75 x the 50% cut-off point 500-1000nm: 85% avererage from the 50% cut-on point to 0.75 x the 50% cut-off point Note: with the exception of the 400nm filter, all SWP filters will drop off in transmission at wavelengths under 400nm.) |
| Rejection | |
| Long Wave Pass: | 99% or greater from 0.9 x the 50% point to the UV |
| Short Wave Pass: | 99% or greater from 1.07 x the 50% point to 1.25 x the 50% point |
| Effective index of refraction (n*) | 1.7 (approximately) |
