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Strange beam

Robk

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I had a return of a defective DVD writer, an LG GSA-H42N. It had a standard closed LD with a window. I put it in a Aixiz holder with a glass lens and the resulting beam was horrible - a line with 2 dots as can be seen in the rather poor photo. I tried a different lens, cleaned the LD window with alcohol on a Qtip, it's not dirt, it's not the lens. This DVD drive would not read or write DVDs - I'm thinking the LD is defective. Anyone run into this? It burns tape and black plastic when run at 225mA, just has an ugly beam!
Rob
www.tomokadesigns.com/laser.jpg  

***EDIT FIXED LINK***
 

S

SenKat

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Robk said:
I don't know why, but the board called ma a stupid spammer!
LOL @@!!

you put three X's in a row - it interprets that as p o r n ....if you wanna do three X's, you have to space them ! x x x like that ! hehehe SOMETIMES it can be amusing :p Othertimes, it is a pain in the ass !

G !
 
S

SenKat

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I have seen a beam spec like that before - a grain of dust has settled on the didoe emitter chip itself - and thus screwed up the whole diode ! now - you MAY get lucky - if you have a centrifuge handy (and TRUST ME PEEPS - if ANYONE has one laying around the house, it is this guy ! LOL) You can spin the diode, and knock the grain loose perhaps - or maybe some sharp rapping movements could knock it loose - but it is sitting right on the emitter - and that boogers everything up !

G !
 

Robk

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Interesting! I may have to rig something up to spin it like you say! I'm assuming that this is why the drive failed in the field - when I got it back the only thought on my mind was to tear it down! Thanks Greg-
Rob
 

LarryQ

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Nahhhhhh...
Good reason to pull it out and put a new open diode out of a 20X burner in there....

hehehehehehe

I have a closed diode out of a 16X burner that has a very similar patern..

one center dot, with a Line that runs through it like yours...Looke like the planet Saturn!

Except mine is "only" a line..it doesn't seem to want to sprout another dot.

Look on the "Brite" side..(Pun Intended)...you have a reason to build another laser!!!

Yaaahooooooooo

Larry
 

Gazoo

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Hmmm...I have seen that before too. I thought it was caused from driving the diode too hard. I just noticed my open can diode is doing it but at least I can try to vacuum it out.. ;D
 

Gazoo

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It didn't work. But it is not very noticeable and I am not too concerned. The power is still there and the beam is just as good as ever.
 

laserterd

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SenKat said:
[quote author=Robk link=1187570730/0#1 date=1187571441]I don't know why, but the board called ma a stupid spammer!
Othertimes, it is a pain in the ass !

G ![/quote]

wait so it doesnt block ass?

anyway, ive had some trouble with lenses before, but i dont think that that is dirt or a scratch. it could be a scratch way on the inside, but not on any externel or other lenses. its kind of weird that it made a whole nother dot though. i wouldnt worry about it too much if it still burns stuff, unless youre interested in more then burning.
 

Gazoo

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Nevermind...I did some more testing and it is definitely the diode causing the line.
 

LarryQ

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WOW Big time ????

If you rotate the whole light and the line moves, then I would question if the diode is really rotating in the last "Test" you did...

If anyone notices it ..just tell them you made a "Saturn's Rings" laser...it burns just as good..but if you adjust the lens just right you can make this COOL Saturn's ring Beam!!


Think "Marketing" here people!!!

LarryQ
 

zerafiel

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I have a saturn beam too but it is more like connect the dots with a single dot since i haven't put much power into the diode yet. My line is almost as bright to eye as the dot. But my camera is not fooled though.
 




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