Abstract
AbstractThe selection rule of the simultaneous absorption of three CO2‐laser photons (ThPA) by tellurium is experimentally determined by a two‐beam method. These experiments yield a new proof for the existence of a strong ThPA in Te. At Δ = 10.8 μm the ThPA absorption rates C⊥ ≈︁ 5 × × 102 cm3/W3 s and C∥ ≈︁ 8 cm3/W3 s are estimated. For the first time a three‐photon spectroscopy of the absorption band of Te (E ⊥ c) is reported. The absorption edge shows a distinct exciton peak. Finally, measurements of the intensity‐dependent transmission (E ⊥ c) of Te under various conditions demonstrate the considerable ThPA reduction at wavelengths ⪆ 11 μm.
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