325 nm Ultrasteep Long Pass Filter

The MP-LPF-325 is a high-performance ultra-steep long-pass interference filter specifically designed for 325 nm laser Raman spectroscopy applications. Manufactured on high-quality fused silica substrates with precision multi-layer dielectric coatings, it provides high blocking (OD > 6) at the 325 nm laser wavelength while offering high average transmission (T_avg > 90%) over the 329.2-733.1 nm spectral range. With an Ultra-steep edge design, the filter has an edge wavelength of 327.5 nm and a transition width of only 3.3 nm (305 cm-1), with an edge steepness of 0.5% / 153.1 cm-1. It effectively suppresses the 325 nm laser line, Rayleigh scattering, and short-wavelength stray light, while efficiently transmitting longer-wavelength Raman scattering signals. This significantly improves the signal-to-noise ratio and weak Raman signal detection capability of spectroscopy systems. The filter is suitable for 325 nm laser Raman spectroscopy, UV Raman spectroscopy, laser spectral analysis, fluorescence detection, materials analysis, and research optical instruments.