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what mode does your laser run in?






My 170mW CNI runs in a clean, perfectly round TEM00. My old X105 would switch to TEM01 on low batteries, and when they batteries were ultra dead sometimes I could squeeze out TEM03, I sometimes thought I could see a 5th dot but it was so dim I'm not sure if I could call it TEM04.
 
i just noticed that my x65 was hitting something like tem05. the strange thing is that it has never hit tem01. :-?
 
I wish i had a picture of each one so I could see the differences. I've never had a laser that mode hopped, but my upcoming 150mW focusable is going to be a BIG surprise!
 
my DIY torch was made to do a weired TEM but I dont know what its called...

it does 5 beams with the middle one being the brightest and the others diverging away from the middle.
 
I like this picture more.

800px-Laguerre-gaussian.png


"The TEM01* mode, the so-called doughnut mode, is a special case consisting of a superposition of two TEM01 modes (i=1,2,3), rotated 360°/4i with respect to one another."
 
thats the one I was looking for!!! I couldn't find it. What article is it under in wikipedia? I searched "transverse modes" "electromegnetic modes" "laser modes" "tem modes" And a bunch more, and I couldn't find that damn picture. I found the other one like it, which has some of the 'square' modes, but I couldn't find that one.
 
GooeyGus said:
thats the one I was looking for!!! I couldn't find it. What article is it under in wikipedia? I searched "transverse modes" "electromegnetic modes" "laser modes" "tem modes" And a bunch more, and I couldn't find that damn picture. I found the other one like it, which has some of the 'square' modes, but I couldn't find that one.
Click to expand...

http://en.wikipedia.org/wiki/Transverse_mode
 
My x45 stays at a tem00 i think. My dilda has 3 dots and a line going through them when the batts are weak. dont know what that is.
 
my romison laser isnt quite Tem00, but it isnt anything worse. it has a normal dot, but some scattered light aroudn it, then there is a thin line that extends from the beam, the line is not nearly as bright as the dot, more like a brighter line of scattered light. I think it's from a dirty/scratched lens, which i'm not able to clean.
the scattered light does go away when i do attempt to clean it tho.
 
360freak said:
My x45 stays at a tem00 i think. My dilda has 3 dots and a line going through them when the batts are weak. dont know what that is.
Click to expand...
You can't classify a diode laser like the dilda with TEM modes because diodes don't mode hop.


mikeeey said:
my romison laser isnt quite Tem00, but it isnt anything worse. it has a normal dot, but some scattered light aroudn it, then there is a thin line that extends from the beam, the line is not nearly as bright as the dot, more like a brighter line of scattered light. I think it's from a dirty/scratched lens, which i'm not able to clean.
the scattered light does go away when i do attempt to clean it tho.
Click to expand...
Your laser is probably perfect TEM00 but with a dirty lens. You can't classify the mode of laser by what the lens distorts the dot into.
 
Don't we typically refer to the rectangular modes? (hermite-gaussian, if memory serves.)
I don't know about the rest of you, but I've never used those weird circle-ey ones. :P
 
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