WHITE PAPER RELEASE - Walkoff in Nonlinear Optics

Will Grossman — July 9, 2025

WHITE PAPER RELEASE

WALKOFF IN NONLINEAR OPTICS

Scientists and engineers working with nonlinear crystals must understand and consider dispersion and walkoff when calculating phase matching conditions, conversion efficiencies, and beam propagation dynamics in nonlinear optical processes such as second-harmonic generation (SHG), sum-frequency generation (SFG), and parametric down-conversion (PDC).

Walkoff occurs due to birefringence in anisotropic crystals, where the direction of energy flow (Poynting vector) is not collinear with the wavevector for certain polarizations. Understanding and accurately modeling dispersion and walkoff are essential for optimizing nonlinear optical systems and ensuring high-performance results in applications such as laser frequency doubling, optical parametric amplification, and quantum optics.

In this white paper, we discuss in depth the polarization state of light, when walkoff matters, and walkoff situations. This paper is a compilation of articles by Dr. Will Grossman, Technical Consultant for GAMDAN Optics.

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