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real basic c mount question

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After reading the string on the c mount 2 watt portable here, I started reading up on c mount diodes. At first I thought the big hole in the middle of the diode was the emitter but then after a short time I found out no, thats the screw mounting hole in the middle. So now i'm moderately confused. I dont see where the beam comes out.  

:-/

http://img15.imageshack.us/img15/6555/cmount.jpg
 

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the black line in the photo?

so it makes a round beam or a line looking beam?

(edit lol you guys were posting as I was editing)
 

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Seems to me these would be easier to work with as far as installation cause you wouldnt have to worry about damage from removing them from a sled or press in damage since they come off with a big screw. Only thing would seem to be getting them cenetered with whatever optics you mounted in front.
 
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The beam tends to be rectangular or square at best. You need some fancy optics to make it round but it can be done. C-mounts are not physically coupled to your external optics. Often there is a diode sitting out in free space with a pair of cylindrical lenses or an anamorphic prism pair or other optics sitting in mounts a distance away channeling the beam into a chunk of YVO or YAG.
 
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m60gunner29 said:
Seems to me these would be easier to work with as far as installation cause you wouldnt have to worry about damage from removing them from a sled or press in damage since they come off with a big screw.
These are a fair bit more delicate than your normal 5.6mm canned diodes. The bonding wires and laser emitter are exposed and easily damaged if your screwdriver happened to slip.
 

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This is useful to me as I was going to get a few small C-mounts to play with and learn the right way to mount and focus them.

thanks for the info
 




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