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Chapter 19-20

Chapter 19-20. Acoustic-optics & Electro-Optics. 其实 ，也属于非 线性光 学. Review. 非线性的来源. 理想模型的偏差 强场驱动下偏离谐 振 子模型 电子云的畸变 等等. Nonlinear Optical Media. The ‘P-E’ relation. From Maxwell’s equations. The Nonlinear Wave Equation. 但是 ， 由 于物质内部的屏蔽作用，在 可见光波段 ，非 线性响应非常 小 …. 低频时 (<MHz), 磁滞回线是种典型的强非线性.

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Chapter 19-20

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  1. Chapter 19-20 Acoustic-optics & Electro-Optics 其实，也属于非线性光学

  2. Review

  3. 非线性的来源 • 理想模型的偏差 • 强场驱动下偏离谐振子模型 • 电子云的畸变 • 等等

  4. Nonlinear Optical Media

  5. The ‘P-E’ relation From Maxwell’s equations

  6. The Nonlinear Wave Equation 但是，由于物质内部的屏蔽作用，在可见光波段，非线性响应非常小… 低频时(<MHz), 磁滞回线是种典型的强非线性

  7. 关注点 • 二次非线性 • 自聚焦 • 四波混频 • 孤子(soliton)

  8. Second-Order Nonlinear Optics

  9. Second-Harmonic Generation (SHG) and Rectification

  10. to maximize the SHG effìciency • the incident wave have the largest possible power P • by use of pulsed lasers with large peak power • be focused to the smallest possible area A • provide the longest possible interaction length L

  11. Optical second-harmonic generation

  12. Electro-Optic Effect

  13. 其实，是Three-Wave Mixing

  14. Frequency and Phase Matching 全部由光子参与的过程，满足。。。

  15. Three-Wave Mixing Modalities

  16. Wave Mixing as a Photon Interaction Process

  17. 两大类可能性 可以动量匹配 不可以动量匹配

  18. Non-Collinear SHG Spontaneous Parametric Downconversion (SPDC).

  19. Generation of Entangled Photons • Parametric down-conversion (PDC) • twin daughter photons are produced simultaneously from a parent photon • the signal and idler photons have natural correlations in energy and momentum. • Type-I phase matching • The generated signal and idler photons have parallel polarizations. • Type-II phase matching • The signal and idler photons have perpendicular polarizations.

  20. Generation of Entangled Photons Parametric down-conversion (PDC)

  21. in Collinear Three-Wave Mixing

  22. Tolerable Phase Mismatch and Coherence Length Lc: 几个微米 L<Lc时（比如非线性晶体的粉末），可以看到一些SHG信号

  23. Quasi-Phase Matching 对非线性感应系数d做周期调制

  24. 畴反转：n不变，d-d….

  25. Third-Order Nonlinear Optics

  26. Kerr medium

  27. Thírd-HarmonícGeneratíon (THG) Optical Kerr Effect

  28. Self-Phase ModulationSelf-Focusing

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