355 nm Ultrasteep Long Pass Filter

The MP-LPF-355 is a high-performance ultra-steep long-pass interference filter specifically designed for 355 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 355 nm laser wavelength while offering high average transmission (T_avg > 93%) over the 359.6-800.8 nm spectral range. With an Ultra-steep edge design, the filter has an edge wavelength of 357.8 nm and a transition width of only 3.6 nm (279 cm-1), with an edge steepness of 0.5% / 140.1 cm-1. It effectively suppresses the 355 nm laser line, Rayleigh scattering, and short-wavelength stray light, while efficiently transmitting longer-wavelength Raman scattering signals, thereby improving the detection sensitivity and signal-to-noise ratio of Raman spectroscopy systems. The filter is widely used in 355 nm UV laser Raman spectroscopy, laser spectral analysis, laser-induced fluorescence, UV spectral detection, research instruments, and precision optical systems.