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	Strålutbredningsmetoden	ABCD Matrix	Finit-differens tidsdomän
Ämnesområde	Optik	Optik	Optik
Familj	Process / pipeline	Process / pipeline	Process / pipeline
Ursprungsår	1978	1966	1966
Upphovsperson	Michael Feit and John Fleck	Herwig Kogelnik and Tingye Li	Kane Yee
Typ	Paraxial propagation algorithm	Ray optics formalism	Finite-difference algorithm
Ursprungskälla	Feit, M. D., & Fleck, J. A. (1978). Light propagation in graded-index optical fibers. Applied Optics, 17(24), 3990-3998.	Kogelnik, H., & Li, T. (1966). Laser beams and resonators. Applied Optics, 5(10), 1550-1567.	Yee, K. S. (1966). Numerical solution of initial boundary value problems involving Maxwell's equations in isotropic media. IEEE Transactions on Antennas and Propagation, 14(3), 302-307.
Alias	BPM, paraxial approximation method	ray transfer matrix, ABCD method, system matrix	FDTD, Yee scheme
Närliggande	3	3	3
Sammanfattning	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.	The ABCD matrix, or ray transfer matrix method, is a compact algebraic framework for analyzing optical systems. Introduced by Kogelnik and Li in 1966, it represents the linear transformation of ray position and angle (or Gaussian beam parameters) through optical elements. This method is foundational in laser physics, Gaussian optics, and optical design, enabling rapid calculation of resonator stability, beam propagation, and system performance.	The Finite-Difference Time-Domain method is a computational technique for solving Maxwell's equations by discretizing space and time on a grid. Introduced by Kane Yee in 1966, FDTD is a foundational approach in computational electrodynamics and optical simulation, enabling direct modeling of electromagnetic wave propagation through complex media.