“Just like any complicated problem, we leave it as an exercise to the viewer”! Funnier (though very encouraging) words have rarely been spoken! Professor Ezekiel left an absolutely amazing legacy with these lectures! Thanks to the staff at MIT for making it available to us all!
@pringles91813 жыл бұрын
Beautifully explained
@mathsk10816 жыл бұрын
I think it would be much more interesting if the physical concept of the appearance of different modes would be explaned.
@syedrahim13942 жыл бұрын
When he's adjusting the mirror mount, is he increasing or decreasing the distance between the output coupler and highly reflective mirror? is he changing the the angle between the two?
@ravichaudhary8052 жыл бұрын
I have coupled the HeNe beam to an external cavity with two mirrors, my output transverse modes continuously oscillates from lower order to higher orders, kindly explain why it is oscillating (The laser is not collimated using a lens, it is diffraction limited and is directly fed to the external cavity mirrors)
@danman31632 жыл бұрын
Why do the higher order modes have higher power? When I measure the 11 transverse mode, it has over double the power of the 00 mode.
@ravichaudhary8052 жыл бұрын
Because the power which can be amplified in higher order modes are being attenuated by the pinhole and are lost, so the power of TEM00 is low at the cost of getting the beam clean.
@ianvangiesen25235 жыл бұрын
Are the number of modes being increased, by increasing the length of the resonator?
@fabianpeter44193 жыл бұрын
No, but the Free Spectral Range gets smaller (FSR = c/2L , L: mirror distance), meaning you dont have to move one mirror as much along the beam axis to see the next resonator mode.