Broad Bandpass Filters are precision optical components designed to transmit a defined wavelength band while effectively blocking unwanted spectral regions. These filters are widely used in scientific research, industrial inspection, optical imaging, and machine vision systems where accurate wavelength control is essential.
Manufactured using advanced dielectric coating technologies, SOT broad bandpass filters deliver high in-band transmission (≥90%), high optical density outside the passband, and excellent environmental durability. The strong multilayer coating structure ensures long-term stability against thermal cycling, humidity, abrasion, and chemical exposure.
With flexible design parameters—including center wavelength (CWL), bandwidth (FWHM), and optical density (OD)—these filters can be customized for applications such as laser scanning, optical measurement, biochemical analysis, and automated inspection systems.
Key Features
- High Optical Performance – High transmittance with strong out-of-band blocking
- Low Temperature Drift – Stable spectral performance under varying environmental conditions
- Durable Coating Structure – Robust film layers resistant to abrasion, chemicals, and humidity
- Narrow & Controlled Bandwidths – Precise wavelength selection for demanding optical systems
- Customizable Designs – CWL, FWHM, and OD tailored to application requirements
Spectrum Transmission
SOT broad bandpass filters are available from near-UV through visible to infrared wavelengths. Each filter provides a flat, high-transmission passband with steep spectral edges to suppress unwanted light. Custom spectral designs are available to optimize performance for specific detectors, light sources, and system geometries.
Coating Parameters
| Parameter | Details |
|---|---|
| Transmittance | T ≥ 90%, T ≥ 95% (Customizable) |
| Center Wavelength (CWL) | 200-2500nm (Selection based on customer requirements) |
| Bandwidth (FWHM) | 20-200nm (Selection based on customer requirements) |
| Optical Density (OD) | OD2, OD3, OD4, OD5, OD6 (Customizable) |
| Dimension | Customizable (Can be mounted with a ring) |
| Note | For more in-stock models, please contact us. |
Common Bandpass Filters
| Model | Center Wavelength (nm) | Bandwidth (nm) | Model | Center Wavelength (nm) | Bandwidth (nm) |
|---|---|---|---|---|---|
| NH-BP365 | 365 ± 5 | 20–60 | NH-BP500 | 500 ± 5 | 20–60 |
| NH-BP370 | 370 ± 5 | 20–60 | NH-BP505 | 505 ± 5 | 20–60 |
| NH-BP390 | 390 ± 5 | 20–60 | NH-BP510 | 510 ± 5 | 20–60 |
| NH-BP400 | 400 ± 5 | 20–60 | NH-BP515 | 515 ± 5 | 20–60 |
| NH-BP405 | 405 ± 5 | 20–60 | NH-BP520 | 520 ± 5 | 20–60 |
| NH-BP410 | 410 ± 5 | 20–60 | NH-BP525 | 525 ± 5 | 20–60 |
| NH-BP420 | 420 ± 5 | 20–60 | NH-BP530 | 530 ± 5 | 20–60 |
| NH-BP430 | 430 ± 5 | 20–60 | NH-BP535 | 535 ± 5 | 20–60 |
| NH-BP440 | 440 ± 5 | 20–60 | NH-BP540 | 540 ± 5 | 20–60 |
| NH-BP450 | 450 ± 5 | 20–60 | NH-BP550 | 550 ± 5 | 20–60 |
| NH-BP455 | 455 ± 5 | 20–60 | NH-BP555 | 555 ± 5 | 20–60 |
| NH-BP460 | 460 ± 5 | 20–60 | NH-BP560 | 560 ± 5 | 20–60 |
| NH-BP465 | 465 ± 5 | 20–60 | NH-BP570 | 570 ± 5 | 20–60 |
| NH-BP470 | 470 ± 5 | 20–60 | NH-BP580 | 580 ± 5 | 20–60 |
| NH-BP475 | 475 ± 5 | 20–60 | NH-BP585 | 585 ± 5 | 20–60 |
| NH-BP480 | 480 ± 5 | 20–60 | NH-BP590 | 590 ± 5 | 20–60 |
| NH-BP490 | 490 ± 5 | 20–60 | NH-BP595 | 595 ± 5 | 20–60 |
Additional models available upon request.
Typical Applications
- Laser Scanning Systems – Precise wavelength isolation
- Optical Measurement & Metrology – Controlled spectral selection
- Machine Vision – Improved contrast and feature detection
- Biochemical & Medical Analysis – Targeted spectral transmission
- Industrial Sorting & Inspection – Color and material discrimination
Need a custom bandpass filter
Contact us with your requirements and operating conditions for a tailored solution.