Fundamentals of Optical Computing Technology by Xiujian Li Zhengzheng Shao Mengjun Zhu & Junbo Yang

Author:Xiujian Li, Zhengzheng Shao, Mengjun Zhu & Junbo Yang
Language: eng
Format: epub
Publisher: Springer Singapore, Singapore

5.2 Principle and Application of Two-Photon Interaction [4]

5.2.1 Two-Photon Interaction

The theory of two-photon interaction was established in the early 1930s. In 1931, Maria Goeppert-Mayer first predicted the existence of two-photon absorption and derived two-photon transition probability using second-order perturbation theory [5]. The probability of a two-photon transition can be expressed as a function of three parameters: the line profile, the transition probabilities that are appropriate for all possible two-photon interaction (Fig. 5.1 represents the four such schemes), and light intensity. The relationship between these factors and can be expressed as follows:

Fig. 5.1Two-photon interaction process schematic. a Two-photon absorption. b Two-photon absorption through the imaginary energy level. c Single-photon excited two-photon emission. d Raman effect two-photon emission

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