The 20BPF25-650 Bandpass Filter is a 2 x 2 inch (50.8 x 50.8 mm) square bandpass filter with a center wavelength of 650 ± 3.5 nm and a Full Width Half Max of 25 ± 3.5 nm. See Curve 19, for transmission graph. Our Bandpass Filters pass a narrow spectral band of UV, visible, or NIR radiation and reject out-of-band wavelengths from the X-ray to the far IR. Applications include spectral radiometry, medical diagnostics, chemical analysis, colorimetry, astronomy, and wherever spectral isolation is required.
| Model | 20BPF25-650 |
|---|---|
| Type | Bandpass Filters |
| Dimensions | 2.0 x 2.0 in. (50.8 x 50.8 mm) |
| Center Wavelength | 650 nm |
| FWHM | 25±3.5 nm |
| Minimum Peak Transmission | 50 % |
| Effective Index of Refraction ne | 1.5 |
| Surface Quality | 80-50 scratch-dig; F/F per MIL-F-48616 scratch-dig |
| Thickness | 0.122 in. |
| Wavelength Shift with Temperature | 0.01 to 0.02 nm/° C nm/°C |
| Humidity Resistance | Per MIL-STD-810E, method 507.3, procedure III, modified to 5 cycles |
| Cleaning | Non-abrasive method, acetone or isopropyl alcohol on lens tissue recommended |
| Damage Threshold | Not for high power lasers |
| Center Wavelength Tolerance | ±3.5 nm |
