The OPTOStokes LP690nm is a high-efficiency longpass filter engineered to act as a decisive gatekeeper between the visible spectrum and the Near-Infrared (NIR). With a cut-on wavelength positioned at the very edge of human vision, this component is designed to transmit NIR signals with exceptional clarity while rigorously suppressing visual noise.
Optimized for demanding optical systems, the LP690nm delivers an average transmission greater than 90 percent across the 690nm to 1100nm range. This ensures maximum photon throughput for NIR imaging sensors and detectors. Simultaneously, it provides a deep blocking depth of less than 1 percent transmission from 350nm up to 670nm. This robust attenuation of ultraviolet and visible light—including standard red wavelengths—makes it a critical component for enhancing contrast and signal integrity in environments with mixed lighting conditions.
Technical Specifications
The table below outlines the specific optical and physical parameters for SKU 21103203. These specifications are verified to meet the precision requirements of industrial and scientific applications.
| Feature | Specification |
|---|---|
| Product Type | Longpass Filter (LP) |
| Passband Range | 690nm - 1100nm (Avg T > 90%) |
| Blocking Range | 350nm - 670nm (Avg T < 1%) |
| Substrate Thickness | 1.0mm |
| Surface Quality | 60/40 (Scratch/Dig) |
| SKU | 21103203 |
Typical Applications
The LP690nm is versatile for applications requiring the separation of NIR signals from visible light sources:
- Fluorescence Microscopy: Functions as an effective emission filter for deep red filter dyes and NIR fluorophores (e.g., Cy5.5), ensuring excitation light is fully blocked.
- IR Photography & Surveillance: Allows 750nm, 850nm, or 940nm IR illuminators to pass while darkening the image to visible light, creating high-contrast night vision.
- Machine Vision: Eliminates interference from ambient factory lighting or daylight, allowing vision systems to focus solely on IR strobe reflections.
- Laser Safety & Alignment: Blocks visible pointing lasers while transmitting IR working beams (system dependent).
Customization & Manufacturing
OPTOStokes is dedicated to providing solutions that fit your hardware, not just our catalog. Our custom optical filters capabilities include:
- Precision Sizing: We can cut and edge-grind filters to tolerances suitable for compact sensor housings.
- Assembly: Options for cementing into custom cells or mounting in standard thread rings.
- Quality Assurance: Rigorous spectral testing ensures every batch meets the transmission and blocking specs.
Streamline Your Optical Supply
High-performance optics should be readily available.
We maintain a strategic inventory of LP690nm filters to support rapid prototyping and bridge-to-production needs. Trust OPTOStokes for consistent quality and reliable delivery schedules.
Ready to upgrade your system's performance? Contact our engineering team at sales@optofilters.com for quotes, technical support, or inventory checks.
