Fraunhofer-wavelength magneto-optic atomic filter at 422.67 nm

Passive Fraunhofer-wavelength atomic filter at 460.7 nm

Passive and magneto-optic atomic filters at 422.7 nm and at 460.7 nm

A Passive Fraunhofer-wavelength Atomic Filter At 422.7nm

Blue-green Fraunhofer-wavelength atomic filters

An Atomic Resonance Filter Operating at Fraunhofer Wavelengths

Sunlight suppression by Fraunhofer-wavelength atomic resonance filters