The **OPTOStokes Ultra Narrow Bandpass Filter (UNBF)** series is designed for applications demanding the highest level of spectral isolation and signal-to-noise ratio (SNR). With a specified Full Width Half Maximum (FWHM) between **1nm and 2nm**, these filters are precision-engineered to select individual laser lines or specific emission peaks with unmatched accuracy.
Our UNBF ultra narrow bandpass filters provide researchers and OEM system designers with exceptional performance across the custom configurable range of **400nm to 1100nm** (Visible to Near-Infrared). The critical feature is the robust out-of-band rejection: a guaranteed **Optical Density (OD) of greater than or equal to 4** (≥OD4) across a wide blocking range (200nm to 1000nm, subject to customization), ensuring that stray light is virtually eliminated.
Technical Performance Specifications
OPTOStokes UNBF performance metrics are customized to your exact system requirements, focusing on precision and rejection depth.
| Specification | Customizable Parameter / Range |
|---|---|
| Center Wavelength (CWL) | 400nm to 1100nm (Customer Specified) |
| Full Width Half Maximum (FWHM) | 1nm to 2nm (Extremely Narrow Bandpass) |
| Peak Transmission | Greater than or equal to 85 percent (Negotiable based on FWHM) |
| Blocking Depth (Out-of-Band) | Optical Density ≥ 4 (T < 0.01 percent) |
| Blocking Range | 200nm to 1000nm (Negotiable, Deep UV to NIR) |
| Product Dimensions | Customized to client specifications |
Advanced Applications Requiring High SNR
The combination of ultra-narrow FWHM and deep out-of-band blocking makes these filters essential for maximizing the high SNR in complex optical systems:
- Laser Line Selection: Isolating specific laser excitation or emission lines (e.g., 785nm, 1064nm) in applications like Raman spectroscopy.
- High-Resolution Fluorescence: Employed in advanced microscopy and sensitive fluorescence detection where separating adjacent spectral lines is mandatory.
- Free-Space Optical Communications (FSO): Used to filter ambient noise, allowing only the designated communication wavelength to pass.
Environmental Sensing: Isolating narrow spectral bands for gas analysis or chemical detection.
| Product | CWL | FWHM | Peak Transmission | Blocking Range | Blocking Depth | Mounted Sizes |
|---|---|---|---|---|---|---|
| UNBP-420 | 420 ± 0.3 nm | 1 ± 0.3 nm | >85% | 400-1100nm (customizable) | ≥OD4 | ∅12.7 mm & ∅25.4 mm |
| UNBP-558 | 558 ± 0.3 nm | 1 ± 0.3 nm | >85% | 400-1100nm (customizable) | ≥OD4 | |
| UNBP-582 | 582 ± 0.3 nm | 1 ± 0.3 nm | >85% | 400-1100nm (customizable) | ≥OD4 | |
| UNBP-777 | 777.2 ± 0.3 nm | 1.2 ± 0.3 nm | >85% | 400-1100nm (customizable) | ≥OD4 | |
| UNBP-785 | 785 ± 0.3 nm | 1 ± 0.3 nm | >85% | 400-1100nm (customizable) | ≥OD4 | |
| UNBP-795 | 795 ± 0.3 nm | 2 ± 0.3 nm | >85% | 400-1100nm (customizable) | ≥OD4 | |
| UNBP-926 | 926.3 ± 0.5 nm | 1.5 ± 0.5 nm | >85% | 400-1100nm (customizable) | ≥OD4 | |
| UNBP-1064 | 1064 ± 0.5 nm | 1.7 ± 0.5 nm | >80% | 400-1100nm (customizable) | ≥OD4 | |
| UNBP-1570 | 1570 ± 1 nm | 5 ± 1 nm | >90% | 400-1100nm (customizable) | ≥OD4 |
Customization and Reliability for OEM Partners
For projects requiring extreme precision and reliable sourcing, OPTOStokes offers **high-level customization support**. We specialize in translating stringent technical needs—including specialized blocking depths (high blocking), unique dimensions, or non-standard CWLs—into consistently manufactured optical components. We guarantee **world-class quality and precision** through rigorous quality control and technical expertise accumulated over 30 years. Our process ensures **reliable lead times** for your high-value instruments.
Maximize Your Signal Integrity
In demanding scientific and industrial environments, sacrificing signal quality due to inferior filtering is not an option. If your current supplier cannot meet the performance benchmark of FWHM 1-2nm and $\ge$OD4 blocking, or if you need reliable delivery for high-volume OEM projects, OPTOStokes is ready.
Challenge us with your most demanding specifications. Contact our engineering team today to initiate your custom filter design and discuss our **extensive in-stock selection** for rapid prototyping. Email: **sales@optofilters.com**.
