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Diffstat (limited to 'gaussian_focus.m')
| -rw-r--r-- | gaussian_focus.m | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/gaussian_focus.m b/gaussian_focus.m index ff444ee..cceeda0 100644 --- a/gaussian_focus.m +++ b/gaussian_focus.m @@ -1,9 +1,14 @@ function [ w, s ] = gaussian_focus( w0, s0, f, lambda ) -%GAUSSIAN_FOCUS Summary of this function goes here -% Detailed explanation goes here +%Focusing of Gaussian beams based on Sidney A. Self's "Focusing of +%spherical Gaussian beams" Applied Optics, Vol. 22, Issue 5, pp. 658-661 (1983) +% Input: lambda = wavelength; +% w0 = waist before the lens; +% s0 = distance of waist before lens (s>0 before lens) +% f = focal length of lens (f>0 for converging lens) +% Output: w = new waist; +% s = position of waist from lens -zR = pi*w0^2/lambda; -s = f*(1+(s0/f-1)/((s0/f-1)^2+(zR/f)^2)); +zR = pi*w0^2/lambda; %Rayleigh Range +s = f*(1+(s0/f-1)/((s0/f-1)^2+(zR/f)^2)); %Eq. (9b) w = w0/sqrt((1-s0/f)^2+(zR/f)^2); -end - +end
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