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what mode does your laser run in?

climbak

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I think the rectangular ones are the ones most frequently encountered in laser pointers because the crystals used are usually rectangular. One of mine was running in cylindrical tem10 and I am guessing the crystals are cylindrical since each kind of mode is dependent on the symmetry of the lasing medium. Here is a picture of the tem10 mode.
 

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Things

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My 40mw green module seems to run in TEM 01, but the dots are really close together, you dont notice it at all when its collimated.
 




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