

K9 Bandpass Filter, Ø25.4 mm, 515 nm, OD 3.0
O-NBPF-25.4-BL507Design Tools
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Overview
Bandpass filters are precision optical components designed to selectively transmit light within a specific wavelength band while effectively blocking all other wavelengths. Built with interference thin-film technology, they deliver high in-band transmission and strict spectral selectivity for spectroscopy, laser systems, and imaging. Narrow bandpass filters offer passbands typically in the 1–10 nm range, making them ideal where precise center-wavelength (CWL) and bandwidth (FWHM) control is required — laser line selection, fluorescence excitation, and laser spectroscopy.
Applications
- Femtosecond / picosecond laser systems
- Fluorescence microscopy (excitation selection)
- Laser spectroscopy & spectral analysis
- Quantum optics & precision imaging
Construction & Performance
- Substrate: K9
- Coating: Dielectric Coating
- Dimensions: Ø25.4 mm
- Start wavelength: 515 nm
- OD: 3.0
- Transmission: 80%
- Coating spec: HR@200-1200 nm, T=80%@515 nm
- Surface quality: 20-10 S-D
- Diameter tolerance: +0.0/-0.2 mm
Storage & Handling
For optimal performance, store and use at 25 °C and 40–60% relative humidity. If the surface becomes contaminated, clean gently with ≥99% alcohol and lint-free lens tissue; never use coarse cloth, water, or abrasive cleaners, which may damage the coating.
| Substrate Material | K9 |
| Dimensions | Ø25.4 mm |
| Start Wavelength | 515 nm |
| OD | 3.0 |
| Transmission | 80% |
| Coating Type | Dielectric Coating |
| Coating Specification | HR@200-1200 nm, T=80%@515 nm |
| Surface Quality | 20-10 S-D |
| Diameter Tolerance | +0.0/-0.2 mm |
Product Family: Bandpass Filters (5 variants)
| Product | SKU | Diameter | Start wavelength | OD | |
|---|---|---|---|---|---|
| UVFS Narrow Bandpass Filter, 38.1 × 12.7 mm, 1025 nm, OD>4.0 |
O-NBPF-38.1x12.7-6.0-BL542
| 38.1 × 12.7 mm | 1025 nm | >4.0 | Contact |
| UVFS Narrow Bandpass Filter, 25.4 × 12.7 mm, 1025 nm, OD>4.0 |
O-NBPF-25.4x12.7-6.0-BL541
| 25.4 × 12.7 mm | 1025 nm | >4.0 | Contact |
| UVFS Narrow Bandpass Filter, Ø25.4 mm, 1025 nm, OD>4.0 |
O-NBPF-25.4-6.0-BL540
| Ø25.4 mm | 1025 nm | >4.0 | Contact |
| UVFS Narrow Bandpass Filter, Ø25.4 mm, 800 nm, OD>4.0 |
O-NBPF-25.4-2.0-BL539
| Ø25.4 mm | 800 nm | >4.0 | Contact |
| K9 Bandpass Filter, Ø25.4 mm, 515 nm, OD 3.0 Current |
O-NBPF-25.4-BL507
| Ø25.4 mm | 515 nm | 3.0 |


