Quasi-Phase Matching (QPM) is a technique used in nonlinear optics to maintain the efficiency of frequency conversion processes by periodically reversing the sign of the nonlinear coefficient, compensating for phase mismatch. This allows for more efficient generation of new frequencies, such as in second harmonic generation, even when perfect phase matching is not possible.

Quasi-Phase Matching

Nonlinear optics is the study of how light interacts with matter in ways that depend nonlinearly on the intensity of the light, enabling phenomena such as frequency doubling and self-focusing. This field is pivotal for developing advanced technologies like laser systems, optical communication, and quantum computing, as it allows for the manipulation of light in ways that linear optics cannot achieve.

nonlinear optics

frequency conversion processes

A nonlinear coefficient is a parameter in mathematical equations or models that quantifies the degree of nonlinearity in the relationship between variables. It plays a crucial role in fields like physics, engineering, and economics, where systems often exhibit complex, non-linear behaviors that cannot be captured by linear models alone.

nonlinear coefficient

phase mismatch

efficient generation of new frequencies

Second harmonic generation (SHG) is a nonlinear optical process where two photons with the same frequency interact with a nonlinear material to produce a new photon with twice the energy, or frequency, of the initial photons. This phenomenon is widely used in laser technology to convert laser light to shorter wavelengths and is a fundamental tool in studying the properties of materials at the molecular level.

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