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Old 05-19-2013, 01:18 AM #1
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Default hourglass shaped dot

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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Old 05-19-2013, 01:20 AM #2
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Default Re: hourglass shaped dot

Sounds like the beam might be hitting something shiny inside the module. Did you press the diode yourself? Is it pressed in straight?
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Old 05-19-2013, 01:20 AM #3
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Default Re: hourglass shaped dot

Have you tried the lens in the other way. Sounds like it is backwards.
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Old 05-19-2013, 01:28 AM #4
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Default Re: hourglass shaped dot

Quote:
Originally Posted by DTR View Post
Have you tried the lens in the other way. Sounds like it is backwards.
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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Old 05-19-2013, 01:34 AM #5
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Default Re: hourglass shaped dot

I would have thought the notches faced outwards too, usually they're so you can adjust the lens. Weird.
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Old 05-19-2013, 01:56 AM #6
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Default Re: hourglass shaped dot

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I would have thought the notches faced outwards too, usually they're so you can adjust the lens. Weird.
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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Old 05-19-2013, 05:03 AM #7
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Default Re: hourglass shaped dot

hourglass = backwards lens, everytime.

Glad its fixed
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Old 05-19-2013, 05:35 AM #8
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Default Re: hourglass shaped dot

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Originally Posted by danefex View Post
hourglass = backwards lens, everytime.

Glad its fixed
Yep! You guys beat me to this thread. I was going to suggest turning the lens around too.
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Old 05-19-2013, 06:14 AM #9
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Default Re: hourglass shaped dot

Quote:
Originally Posted by rileyscool101 View Post
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!
The "box" is normal. From what I understand it is an internal reflection from the laser die itself...
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