Organic nonlinear optical materials are organic optical media that exhibit nonlinear optical effects for strong lasers. These effects include second harmonic generation, optical rectification, and other phenomena. Nonlinear optical materials have fast response speeds, large nonresonant optical effects, low dielectric constants, and low absorption coefficients. Organic nonlinear optical materials are used in a variety of optical and photonic devices, including frequency converters, optical switches, and modulators. They are also used in laser technology and optical communications, where their ability to manipulate light at high speeds and intensities is critical to the development of advanced systems.