circles in my blu-ray light spot

[bob808]

Do you have any idea if those circles in the light-spot are normal? What are they? It's a GGW higher wavelength diode set at 155mA on flexdrive in a Pocket Mini host with copper heatsink

 

[StardustSprinkles]

I'm pretty sure everyone gets some ghost with a violet...

 

[bob808]

sorry, the attachments gave an error on first post but didn't see it. I have attached 2 photos

 

[StardustSprinkles]

Ahh, I see now. My folds does that, only because the focusing lens is a mess. It looks like bacteria in a petri dish when I spin it lol. :crackup: Maybe that's the issue you're having, if the lens is acryllic I think it does that.

 

[daguin]

Could be small spots of foreign matter on the diode window. They are not a problem when you add the lens and focus the laser, right?

Peace,
dave

 

[bob808]

the lens is removed, only the module housing with the bare diode. thx daguin, I'll clean it up. would a photo-camera lens cleaning solution with glasses cleaning cloth do?

 

[daguin]

the lens is removed, only the module housing with the bare diode. thx daguin, I'll clean it up. would a photo-camera lens cleaning solution with glasses cleaning cloth do?

It is worth a try. I would just leave it alone. They are not enough to significantly effect your output. I would start with puffs of compressed air. DON'T BLOW on it with your mouth. You could just add spittle to the problem. If compressed air doesn't do it, use a lenspen. Anything beyond that is a risk.

Be gentle. You do NOT want a broken window.

Peace,
dave

 

[bob808]

ok thank you very much daguin.