Focusing of spherical Gaussian beams using a thin lenses (Based on Self's paper, Applied Optics, Vol. 22, Issue 5, pp. 658-661 (1983), http://www.opticsinfobase.org/ao/abstract.cfm?id=26503 )
lambda - beam's wavelength
beam_waist - waist of the beam at the waist position (wp)
wp - waist position
fpos - lenses positions vector [pos1, pos2, pos3 ...]
f - lenses focal-lengths vector [f1, f2, f3 ...]
Gaussian_Propagation(8e-7,0.00075,-0.1,[0 0.1],[-0.5 0.2])
Natan (2020). Gaussian_Propagation (https://github.com/adinatan/Gaussian_Propagation), GitHub. Retrieved .
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