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Old 02-10-2017, 08:19 PM #1
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Default Square shaped aberration in new blue laser diode. Should I ask for a replacement?



This is a picture I took of the light from the laser shining on a door, with a pencil blocking the actual beam so that the light from the aberration would show up better. (The pencil started smoking while I was trying to take this picture.)

Have tried cleaning the optics with a lint-free microfiber cloth meant for camera lenses, and with isopropal alcohol and q-tips. No effect. Should I try to get a replacement, or is this normal? Is there an easy way to fix it myself?

This is a PLT5 450B, 450nm laser diode with G-2 Glass Lenses. I got it as part of an RGV bundle from DTR's Laser Shop.


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Old 02-10-2017, 08:40 PM #2
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Default Re: Square shaped aberration in new blue laser diode. Should I ask for a replacement?

This is completely normal, caused by reflection within the diode.
It will always happen with multimode diodes and G2 lenses.
If you use a 3-element or G7 lens, you will eliminate this splash.
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Old 02-10-2017, 08:49 PM #3
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Default Re: Square shaped aberration in new blue laser diode. Should I ask for a replacement?

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Originally Posted by Sta View Post
This is completely normal, caused by reflection within the diode.
It will always happen with multimode diodes and G2 lenses.
If you use a 3-element or G7 lens, you will eliminate this splash.
Sta, you're signature is becoming too darn long

-Alex
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Old 02-10-2017, 08:58 PM #4
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Default Re: Square shaped aberration in new blue laser diode. Should I ask for a replacement?

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Sta, you're signature is becoming too darn long

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Haha yes, I've been thinking of cutting it down. Tried to put it into a just wavelengths form (like rhd) but that just ended up looking bad. Any ideas?
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Old 02-10-2017, 09:05 PM #5
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Default Re: Square shaped aberration in new blue laser diode. Should I ask for a replacement?

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Originally Posted by Sta View Post
Haha yes, I've been thinking of cutting it down. Tried to put it into a just wavelengths form (like rhd) but that just ended up looking bad. Any ideas?

Ask CurtisOliver if he'll send you the fancy spreadsheet he used to make his.
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Old 02-10-2017, 09:06 PM #6
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Default Re: Square shaped aberration in new blue laser diode. Should I ask for a replacement?

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Ask CurtisOliver if he'll send you the fancy spreadsheet he used to make his.
I actually wrote up a java program to do that more quickly (and used it in the past!) but haven't been able to locate it lately.
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Old 02-10-2017, 10:19 PM #7
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Default Re: Square shaped aberration in new blue laser diode. Should I ask for a replacement?

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Originally Posted by PatrickJS View Post


This is a picture I took of the light from the laser shining on a door, with a pencil blocking the actual beam so that the light from the aberration would show up better. (The pencil started smoking while I was trying to take this picture.)

Have tried cleaning the optics with a lint-free microfiber cloth meant for camera lenses, and with isopropal alcohol and q-tips. No effect. Should I try to get a replacement, or is this normal? Is there an easy way to fix it myself?

This is a PLT5 450B, 450nm laser diode with G-2 Glass Lenses. I got it as part of an RGV bundle from DTR's Laser Shop.
Betcha that's schmutz on the diode window. If you have a high power magnifying glass or a jewlers loupe take a look at the diode window. Schmutz on optics produces that same spotty pattern that's why I think it's schmutz. I also have a high power 405nm laser with the same problem. It has something on the window.

Last edited by steve001; 02-10-2017 at 10:23 PM.
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Old 02-10-2017, 11:01 PM #8
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Default Re: Square shaped aberration in new blue laser diode. Should I ask for a replacement?

My 405 challenger has the square too with a -g7lens perfectly normal on these diodeseven my green pen build has it with a 3e lens however it is fainter.
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