The 455nm notch filter is a band-stop optical component centered at 455nm wavelength. Utilizing ion beam sputtering multilayer hard coating technology, it constructs an interference-based high-reflection band on a glass substrate to reflect or absorb light within this wavelength range while transmitting other wavelengths with minimal loss. Typical specifications: stopband width 20–40nm, blocking depth ≥OD6 (T＜0.001%), passband transmission >90%, covering the 380–780nm visible spectrum; surface quality 40-20, wavefront distortion <λ/4, capable of withstanding 1kW/cm2 continuous laser power. Primarily applied in Raman spectroscopy, fluorescence imaging, laser protection, and display optics, it effectively suppresses 455nm laser or LED excitation sources while maintaining high transmission in signal channels and low background noise.