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Investigation of the simultaneous absorption of three CO 2 ‐laser photons by tellurium
Author(s) -
Pöhler M.,
Staupendahl G.
Publication year - 1978
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220860125
Subject(s) - tellurium , absorption (acoustics) , photon , laser , absorption edge , wavelength , absorption spectroscopy , two photon absorption , intensity (physics) , atomic physics , optics , materials science , extended x ray absorption fine structure , analytical chemistry (journal) , chemistry , physics , optoelectronics , band gap , inorganic chemistry , chromatography
The selection rule of the simultaneous absorption of three CO 2 ‐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 × × 10 2 cm 3 /W 3 s and C ∥ ≈ 8 cm 3 /W 3 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.