SP700nm Shortpass Dichroic Mirror: Visible/NIR Beam Separator (45° AOI)
The OPTOStokes **SP700nm Dichroic Mirror** is a high-performance **Shortpass Filter** engineered to deliver optimal spectral separation at the 45° Angle of Incidence (AOI). Its design is centered on efficiently **transmitting visible and near-red light** while providing **deep rejection of Near-Infrared (NIR) wavelengths**. This makes the SP700nm an indispensable component in complex optical systems that require managing both visible signals and high-power NIR lasers.
Critical Technical Specifications
Built on a precision 1.45 mm substrate, the SP700nm ensures low wavefront distortion and is perfectly suited for high-end imaging and OEM integration.
| Parameter | Specification |
|---|---|
| Filter Type | Shortpass Dichroic |
| Transmission Passband (T) | > 90% T from 400 nm to 750 nm |
| Blocking Stopband (R) | < 1% T (or > 99% R) from 800 nm to 975 nm |
| Angle of Incidence (AOI) | 45° (Degrees) |
| Substrate Thickness | 1.45 mm |
| Surface Quality (S/D) | 60/40 scratch-dig |
High-Efficiency Visible/NIR Separation
The **SP700nm Shortpass Mirror** is meticulously designed to isolate visible signals from NIR interference:
- High Visible Throughput: Allows the full visible spectrum up to 750 nm to pass with **greater than 90% efficiency**, ensuring maximum signal fidelity for fluorescence emission or visible imaging.
- Deep NIR Rejection: Provides **deep blocking** (T < 1%) for critical NIR laser lines, such as 808 nm, 850 nm, or 980 nm, effectively reflecting them. This is vital for reducing background noise and protecting detectors.
- Optimized for 45° AOI: The coating performance is specifically tuned for a 45° angle, ideal for efficient beam combining (reflecting NIR laser) or beam splitting (separating visible signal from NIR light).
Core Applications
This dichroic optical filter excels in advanced multi-spectral environments:
- Fluorescence Microscopy: Acts as the primary emission filter, transmitting the shorter-wavelength fluorescence signal (400-750 nm) while reflecting or blocking longer-wavelength excitation lasers (800-975 nm).
- Laser Systems & Beam Combination: Used to combine a visible imaging path with an **NIR laser source** (e.g., $808\text{nm}$ for targeting), ensuring high efficiency for both channels without cross-talk.
- Machine Vision & Spectroscopy: Splits visible scene light from dedicated NIR illumination or analysis channels for sophisticated multi-spectral data acquisition.
OPTOStokes Quality and Custom Options
OPTOStokes stocks **SP700nm Shortpass Mirrors** for rapid deployment in your system. We guarantee consistent 60/40 surface quality and reliable spectral performance.
For unique integration requirements, our custom options include: custom sizing (circular, square, or irregular shapes), alternative thickness, and optional lens mounts for easy integration. If you need a slightly different cut-off wavelength or AOI, our **precision manufacturing** ensures we can deliver tailored specifications with controlled lead times.
Having issues with beam separation or filter fit?
Email sales@optofilters.com or message us with your system details—our optical engineering team will help you find the right solution.
