مقایسهٔ روش‌ها

	Z-scan	روش انتشار پرتو
حوزه	اپتیک	اپتیک
خانواده	Process / pipeline	Process / pipeline
سال پیدایش	1990	1978
پدیدآور	Mansoor Sheik-Bahae, David Hagan, and Eric Van Stryland	Michael Feit and John Fleck
نوع	Measurement technique	Paraxial propagation algorithm
منبع بنیادین	Sheik-Bahae, M., Said, A. A., Wei, T. H., Hagan, D. J., & Van Stryland, E. W. (1990). Sensitive measurement of optical nonlinearities using a single beam. IEEE Journal of Quantum Electronics, 26(4), 760-769.	Feit, M. D., & Fleck, J. A. (1978). Light propagation in graded-index optical fibers. Applied Optics, 17(24), 3990-3998.
نام‌های دیگر	Z-scan method, nonlinear refraction measurement	BPM, paraxial approximation method
مرتبط	3	3
خلاصه	The Z-scan technique is an experimental method for measuring nonlinear optical properties of materials, particularly third-order susceptibility and nonlinear absorption. Developed by Sheik-Bahae, Hagan, and Van Stryland in 1990, Z-scan uses a tightly focused laser beam and moves the sample along the beam propagation axis (z-axis), recording transmission variation to deduce nonlinear refraction and absorption coefficients with high sensitivity.	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.