Can someone please help me with plotting this function of the Gaussian Beam wavefront radius?!

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Melissa Merhej
Melissa Merhej 2016-9-14
评论： Melissa Merhej 2016-9-27
Given: Power and energy (but i don't think these have anything to do with the plotting). Also the wavelength of the laser is given (248 nm). Nothing else is given....
I need to plot R(z).

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回答（1 个）

Dan Po
Dan Po 2016-9-27
编辑：Dan Po 2016-9-27
calculate: w0, lambda and set them as variables. i am guessing lambdaL=248
clc
clear
close
%
w0=4;
lambda=2;
z=1:1000; %or your wanted plotted values
beamradius=w0*sqrt(1+((lambda*z)/(pi*(w0).^2)).^2);
%
plot(z,beamradius,'r')
title('blabla bla')
xlabel('blab bla bali') % x-axis label
ylabel('blab bla bali') % y-axis label
legend('z = whatever','Location','northwest')
check for units
  1 个评论
Melissa Merhej
Melissa Merhej 2016-9-27
Thank you Dan for the help, do you by any chance know how to make the code locate a specific coordinate on the plot if i only have one of the coordinates?
So i basically for example have y=ax+b ; i want my code to go to point x and locate y without me having to calculate y. And i want it to show on the graph.
Thank you!

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