Infrared Linear Variable Filters (LVF)
Product information "Infrared Linear Variable Filters (LVF)"
0.9-5.0 µm; Transmission 50%-75%; FWHM 1%, 2% * Center λ; Dimensions 15x3.5 mm; Thickness 0.5 mm; Surface Quality <60-40 Scratch-Dig
Infrared linear variable filters (LVF) are narrow band filters where the center or peak wavelength changes continuously along its length from one side to the other – and across the device’s full wavelength range. Vortex’s linear variable filters feature a narrow band profile with a “full width half maximum” (FWHM) bandwidth of 1% or 2% of peak wavelength.
All of the Vortex infrared linear filters exhibit high angular tolerance, extremely low change with temperature and very high resistance to thermal shock. Our range of standard infrared linear variable filters allows customers to explore the technology but at a relatively low cost:
| Standard Infrared Linear Variable Filters (LVF) | |||||
| Part Number | Wavelength Range |
Bandwidth (as a % of Center Wavelength) |
Basic Blocking Range | Gradient of Change | Dimensions (L x W x T) |
| LVF 0.9-1.7-3.5-15-0.5-2% | 0.9-1.7 µm | 2% (Generation 1) | UV-1.8 µm, OD>2.5 Ave. Outside the Transmission Band |
60 nm/mm | 15 x 3.5 x 0.5 mm |
| LVF 1.3-2.6-3.5-15-0.5-2% | 1.3-2.6 µm | 2% (Generation 1) | 1.2-2.6 µm, OD>2.5 Ave. Outside the Transmission Band | 85 nm/mm | 15 x 3.5 x 0.5 mm |
| LVF 2.5-5.0-3.5-15-0.5-2% | 2.5-5.0 µm | 2% (Generation 1) | 1.8-5.5 µm, OD>2.5 Ave. Outside the Transmission Band | 165 nm/mm | 15 x 3.5 x 0.5 mm |
| LVF 0.9-1.7-3.5-15-0.5-1% | 0.9-1.7 µm | 1% (Generation 2) | UV-1.8 µm, OD>3.5 Ave. Outside the Transmission Band |
60 nm/mm | 15 x 3.5 x 0.5 mm |
| LVF 1.3-2.6-3.5-15-0.5-1% | 1.3-2.6 µm | 1% (Generation 2) | 1.2-2.6 µm, OD>3.5 Ave. Outside the Transmission Band | 85 nm/mm | 15 x 3.5 x 0.5 mm |
Vortex also designs and manufactures custom infrared LVFs, featuring different bandwidths, sizes (e.g. to suit the user’s detector window dimensions), etc. to meet your needs. Contact the AMS Technologies filter experts today to discuss a unique customized linear variable filter, designed, specified and manufactured to your application’s requirements.
Key Features:
- Peak Wavelength Changes Continuously With Distance Across the LVF’s Length
- Transmission: 50% to 75% Across the Band
- To Extend the LVF’s Blocking Range, a Suitable Bandpass Filter Can Be Added
- Substrate Dimensions (LxW): 15 mmx 3.5 mm
- Substrate Thickness: 0.5 mm
- Surface Quality: <60-40 Scratch-Dig
Key Features of Generation 2 Infrared Linear Variable Filters:
- 2 Ranges Covered, 0.9-1.7 µm and 1.3-2.5 µm
- Bandwidth (FWHM): 1% x Center Wavelength
- Blocking Greater Than OD 3.5 Average Outside Passband
- Specifically for Systems Where Higher Signal-to-noise Ratio is Critical
Key Features of Generation 1 Infrared Linear Variable Filters:
- 3 Ranges Covered, 0.9-1.7 µm, 1.3-2.5 µm and 2.5-5.0 µm
- Bandwidth (FWHM): 2% x Center Wavelength
- Blocking Greater Than OD 2.5 Average Outside Passband
Applications: Mini-spectrometers; Multi-gas Analysis; Industrial Process Monitoring; Other