It is found, in the case of small dephasing, that instead of electromagentically induced transparency (EIT) at resonance, electromagnetically induced absorption (EIA) can occur due to the effect of optimal SGC.

Based on the introduction of high frequency induction infrared absorption,this paper studies its application on the sulphur content determination in tungsten concentrate.

UV-VIS absorption spectrum and its derivative of absorption spectrum were used to detemine the shift of band-edge of optical absorption and band gap value along with the variation of temperature.