Energy band-gap dependence of two-photon absorption
Eric W. Van StrylandCenter for Applied Quantum Electronics, Department of Physics, North Texas State University, Denton, Texas 76203M. A. WoodallCenter for Applied Quantum Electronics, Department of Physics, North Texas State University, Denton, Texas 76203Herman VanherzeeleCenter for Applied Quantum Electronics, Department of Physics, North Texas State University, Denton, Texas 76203M. J. SoileauCenter for Applied Quantum Electronics, Department of Physics, North Texas State University, Denton, Texas 76203
1985en
ABI
Abstract
We present measurements of the two-photon absorption coefficients β2 of 10 different semiconductors having band-gap energies between 1.4 and 3.7 eV. We find that β2 varies as Eg−3, as predicted by theory. In addition, the absolute values of β2 agree with theory, which includes the effect of nonparabolic bands, the average difference being less than 26%. This agreement permits confident predictions of two-photon absorption coefficients of other materials at other wavelengths.
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