The OPTOStokes LP540 Longpass Filter is a precision optical edge filter designed to transmit wavelengths longer than the 540nm cut-on point while effectively blocking shorter wavelengths. With a high transmission range extending from 550nm into the Near-Infrared (1100nm), this filter appears yellow-orange to the human eye, as it blocks ultraviolet, blue, and green light. It is an essential optical component for applications requiring spectral separation and signal enhancement in the Vis-NIR spectrum.
Technical Specifications
Fabricated from high-quality optical glass, Part Number 21101457 ensures consistent spectral performance and surface quality suitable for imaging systems.
| Specification | Parameter / Value |
|---|---|
| Product Type | Longpass Filter (LP540) |
| Part Number | 21101457 |
| Passband (Transmission) | 550-1100nm @ Tave > 90% |
| Stopband (Blocking) | 350-520nm @ T < 1% |
| Thickness | 1.0mm |
| Surface Quality | 60/40 (Scratch/Dig) |
Primary Applications
This longpass filter is widely utilized in optical setups to eliminate stray light and improve contrast:
- Fluorescence Imaging: Used as an emission filter to block short-wavelength excitation light while passing longer wavelength fluorescence.
- Machine Vision: Enhances contrast by blocking blue/green ambient light in inspection systems using red or IR illumination.
- Spectral Sorting: Separates the visible spectrum for multi-channel detection systems.
- Photography: Reduces atmospheric haze and emphasizes tonal contrast in monochrome imaging.
Customization & Manufacturing
OPTOStokes provides robust custom optical filters services to meet your specific project requirements.
- Dimensions: Available in standard sizes (e.g., Ø25mm, 50x50mm) or custom geometries cut to your mechanical housing specs.
- Substrate & Coating: We can adjust the wavelength range and blocking depth (OD) based on your sensor sensitivity.
- Surface Quality: Standard 60/40 ensures cost-effectiveness, with higher precision options available for laser applications.
Why Choose OPTOStokes?
Spectral Accuracy: Our LP540 filters deliver a sharp transition and a high transmission filter profile (>90%), ensuring maximum signal throughput for your optical system.
In Stock & Ready to Ship: Part #21101457 is available for immediate delivery. For bulk orders or custom specifications, contact our engineering team at sales@optofilters.com.
