This scattering-type nar-field optical microsocpe operates both in air and down to LHe temperatures (4 Kelvin) and uses the IR beamline at FELBE/TELBE (HZDR) for opitcal excitation. As a result, wavelnegths from 4 µm down to 1 mm might be covered, allowing to answer a manifold of fundamental and applied question in physics.