Longpass filters provide a wide blocking bandwidth, high blocking depth, high transmission and sharp slope. They are widely used in fluorescence excitation spectrum measurement, Raman spectrum, spectral group and astronomical observation applications. When combining with our shortpass filters, they can be used to set up variable bandwidth bandpass filters system. We also provide mounted filters which can be easily used in the optical system.
| Material: H-K9L (CDGM) | TWE: λ/4@633nm |
| Parallelism: <30'' | Surface Quality: 60/40 |
| Dia. tolerance: +0.0/-0.1mm | Thickness: 2±0.2mm |
| *Central wavelength(λC): ±2% | Transmission: Tavg>85% |
| Blocking depth: OD2 | **Cutting Slope: <3% |
| Clear aperture: >90% | AOI: 0° |
| *Central wavelength(λC): The wavelength with transmission=50% T max | |
| **Cutting Slope: (λ(T80%) -λ(T10%)/λ(T10%)) *100% | |
