Chinese Journal of Lasers, Volume. 11, Issue 10, 630(1984)
[in Chinese]
The characters of two-photon absorption in gases, liquids and solids are discussed by means of semiclassical theory and comparative luminescence experiments. It is shown that the two-photon absorption for electric dipole-forbidden levels is dipole-dipole transition. Both one-photon absorption of the laser second harmonic and two-photon absorption of the laser fundamental harmonic are allowed in some materials.
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[in Chinese]. [J]. Chinese Journal of Lasers, 1984, 11(10): 630