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hourglass shaped dot

R

rileyscool101

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Okay so I put together my first laser today, using an a140 diode and an aixiz 3 element lens, and while the beam and power look phenomenal, my dot sucks. It looks like this: |>.<| horrible representation but my phone is currently dead so I have no camera... It doesn't go away until I unfocus the dot to the point where it takes up all the space that the hourglass would extend to... Any ideas? I already tried using a camera lens cleaner, and nothing has changed..
 
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Things

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Sounds like the beam might be hitting something shiny inside the module. Did you press the diode yourself? Is it pressed in straight?
 
DTR

DTR

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Have you tried the lens in the other way. Sounds like it is backwards.:beer:
 
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rileyscool101

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DTR said:
Have you tried the lens in the other way. Sounds like it is backwards.:beer:
Click to expand...

i feel like an idiot, i assumed the side with the inner notches faced outwards, but I switched it and it's infinitely better. There is now however a very faint "box" above the dot, but it's my understanding that is normal. Thank you for this!
 
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T

Things

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I would have thought the notches faced outwards too, usually they're so you can adjust the lens. Weird.
 
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rileyscool101

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Things said:
I would have thought the notches faced outwards too, usually they're so you can adjust the lens. Weird.
Click to expand...

I realized there's 2 sets of notches, one set holding the glass in place. I assumed these would be the notches to face outward, as I thought it would cause reflection into the diode if it faced inwards. However after reading this I realized why the other set of notches were there, and now I'm feeling even stupider. Rookie mistake I guess haha
 
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danefex

danefex

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hourglass = backwards lens, everytime.

Glad its fixed :beer:
 
HitShane

HitShane

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rileyscool101 said:
i feel like an idiot, i assumed the side with the inner notches faced outwards, but I switched it and it's infinitely better. There is now however a very faint "box" above the dot, but it's my understanding that is normal. Thank you for this!
Click to expand...

The "box" is normal. From what I understand it is an internal reflection from the laser die itself...
-Shane
 
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