Nonlinear optical sources are devices or materials that exploit nonlinear optical effects to generate or manipulate light, particularly in the terahertz (THz) frequency range. These sources play a crucial role in various applications, allowing the conversion of laser light into THz radiation through processes such as difference frequency generation, optical rectification, or four-wave mixing. Their ability to produce high-intensity THz waves makes them essential for advanced imaging techniques and spectroscopic methods.
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