手法を比較

	ビーム伝搬法	フーリエ光学
分野	光学	光学
系統	Process / pipeline	Process / pipeline
提唱年	1978	1822
提唱者	Michael Feit and John Fleck	Joseph Fourier and Ernst Abbe
種類	Paraxial propagation algorithm	Spectral decomposition method
原典	Feit, M. D., & Fleck, J. A. (1978). Light propagation in graded-index optical fibers. Applied Optics, 17(24), 3990-3998.	Goodman, J. W. (1968). Introduction to Fourier Optics. McGraw-Hill.
別名	BPM, paraxial approximation method	frequency-domain optics, wave optics, diffraction theory
関連	3	3
概要	The Beam Propagation Method is a computational technique for simulating the propagation of optical beams through slowly varying, weakly guiding structures. Developed by Feit and Fleck in 1978, BPM exploits the paraxial approximation to reduce the full vector wave equation to a scalar or vector envelope equation, enabling efficient simulation of waveguides, integrated optics, and photonic devices.	Fourier optics is a mathematical framework that analyzes optical systems and phenomena using Fourier transforms and frequency-domain methods. Grounded in Joseph Fourier's 1822 work on heat diffusion and Ernst Abbe's microscopy theory, this approach decomposes optical fields into plane waves or spatial frequencies, revealing how optical systems manipulate and filter these components to produce images and transmit information.