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

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Melissa Merhej 2016-9-14

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评论： Melissa Merhej 2016-9-27

r.JPG

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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Answer 1

Dan Po 2016-9-27

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编辑：Dan Po 2016-9-27

在 MATLAB Online 中打开

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

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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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