Lasers & Optoelectronics Lecture 8: Gaussian Beams (Cornell ECE4300 Fall 2016)

[@x3llence]

Hello! @17:34 that exp ( -r^2 / w(z) ) , w should be squared right?

[@nivesh3555]

I also get the second derivative wrt z in the 3rd equation(equation for psi). Could anyone explain how the second derivative wrt z was cancelled from equations 2 to 3?

[@x3llence]

Also @43:16 i think you forgot the square root?

[@matheusfellipedamacena6142]

Is there a 2nd class of this subject? I still didn't get how to sort out the distance from the tip of the light source to the beam waist i.e. where the beam waist (z=0) located in space. Can anybody help me?

[@richtofensanchez8233]

The answer is 47

[@debashisparida1097]

The q(z) helps u to locate where ur beam waist would be. Essentially the beam waist is the beam radius at z=0.

[@skydahe9615]

Very clear derivation!

[@chymoney1]

This is fantastic wow!!!

[@grantgibson8034]

Wish i could thumbs up twice.

[@fbazsa11]

11:00 2jz engine oh shit

[@carlosarturoriveraquezada7783]

he seems to be a genius but what an awful writting, he shouldn't be there...