What are the core advantages of notch filters?
High precision cut-off: adopting multi-layer hard coating technology, it can accurately block the target wavelengths (such as 355nm, 532nm, 1064nm and other common laser bands), with transmittance attenuation of OD4 or more, effectively eliminating the interference light.
Wide transmittance bandwidth: maintains high transmittance of >90% on both sides of the cut-off band, compatible with UV, VIS and NIR spectral requirements, suitable for multi-scenario optical systems.
Low angular sensitivity: stable performance within 0-30° angle of incidence, avoiding wavelength drift problems caused by angular offset, and improving equipment adaptability.
Super durability: optical glass substrate combined with ion-assisted deposition process, anti-scratch, moisture and heat resistant, no attenuation in long-term use.
 

High Precision Notch Filter vs. Ordinary Notch Filter
Features	High Precision Notch Filter	Ordinary Notch Filter
Bandwidth(Δλ)	<1nm (ultra narrowband)	5-20nm
Optical Density(OD)	≥OD6 (T≤0.0001%)	OD3-OD4 (T≤0.1%)
Edge Steepness	Transition region<2 nm (90% → 10% transmittance)	Transition region 5-10nm
Passband Ripple	<1% (ultra-high flatness)	3-5% fluctuation