Selective Wavelength Blocking: Notch filters block specific wavelengths of light, creating a “notch” in the transmission spectrum. This selective blocking is crucial for removing unwanted spectral lines or laser wavelengths.

High Transmission Out of Stop Band: They offer high transmission (>90%) outside the blocked wavelength range (stop band), ensuring minimal loss of light in desired spectral regions.

Sharp Transition Slopes: Optical notch filters have sharp transitions between the stop band and the pass band, providing precise spectral control.

Optical Density (OD): This parameter defines the strength of rejection for unwanted wavelengths. Higher OD values indicate stronger rejection capabilities.

Applications: Spectroscopy, Fluorescence Microscopy, Biochemical Analysis, etc.