325 nm Laser Line Bandpass Filter

The MP-LLF-325 is a high-performance narrow-band interference filter specifically designed for the 325 nm laser wavelength. Manufactured on high-quality fused silica substrates with multi-layer dielectric coatings, it provides high transmission (T > 80%) at the 325 nm laser wavelength while offering deep out-of-band blocking up to OD > 6 on both sides of the passband. It effectively filters background light and stray light outside the target band, improving the signal-to-noise ratio and detection accuracy of optical systems. With a narrow FWHM bandwidth of only 1.2 nm, the filter features narrow bandwidth, high transmission, and deep blocking, making it suitable for optical systems that require high selectivity for the 325 nm laser line. The filter is widely used in 325 nm UV laser systems, He‑Cd lasers, UV Raman spectroscopy, laser-induced fluorescence, spectral analysis, UV imaging, and scientific instrumentation.