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Old 06-15-2008, 07:38 AM #1
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Default red burner diode question

I just built my first laser today (thanks a lot to the great tutorials on this forum) and I hooked it up to a supply of 5 AAA's. I noticed that the beam was very wide so I adjusted the lens and got it to focus properly and although it is very bright, it does not burn or put out any heat. I am using the red diode from stonetek.org ( Sony SLD1239JL-54 16X DVD Burner OEM Diode ) because there was a post in the forum saying it was a burning diode. I also had to turn the knob on the pot to get the laser to be brighter than my 5mw green laser.
Is there something wrong I could be doing that is preventing the laser from burning?
Also the reflection of the light off stuff is VERY bright, should I be concerned with that?


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Old 06-15-2008, 08:12 AM #2
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Default Re: red burner diode question

Try focusing it to a pinpoint.
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Old 06-15-2008, 11:07 AM #3
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Default Re: red burner diode question

Point it at something like a meter away. Then keep twisting the lens until its at the smallest point possible. Then put a match at the pinpoint and see if the laser lights the match.

EDIT: make sure you have goggles on, you don't want a black spot wherever you look at in the future....
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Old 06-15-2008, 03:02 PM #4
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Default Re: red burner diode question

Quote:
Originally Posted by fartsniffer
I just built my first laser today (thanks a lot to the great tutorials on this forum) and I hooked it up to a supply of 5 AAA's. I noticed that the beam was very wide so I adjusted the lens and got it to focus properly and although it is very bright, it does not burn or put out any heat. I am using the red diode from stonetek.org ( Sony SLD1239JL-54 16X DVD Burner OEM Diode ) because there was a post in the forum saying it was a burning diode. I also had to turn the knob on the pot to get the laser to be brighter than my 5mw green laser.
Is there something wrong I could be doing that is preventing the laser from burning?
Also the reflection of the light off stuff is VERY bright, should I be concerned with that?

What kind of circuit are you using to drive the laser diode ? If you hooked it direct to 5 AAA's and a pot - you probably smoked the diode. Post some pics of your circuit ?? Oh - and describe it, too !
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Old 06-15-2008, 09:25 PM #5
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Default Re: red burner diode question

I do have a circuit in place to regulate the power. Although it is not very good (thanks in part to not having any tools besides an exacto knife and a very bad soldering iron), it should do its job just fine.
I cannot post links cause my post count isnt high enough, but I'm sure most of you will know what to do with:
h ttp://img75.imageshack.us/img75/3006/pic0024hz0.jpg
That pic shows everything used in the circuit. The tube beside the battery is just a temporary solution untill I can make a real case for the batterys.
Also I have a close up pic of the circuit:
h ttp://img150.imageshack.us/img150/5861/pic0030xk0.jpg
I know some of the wires look like they are not soldered, but they are, and are firmly in place.
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Old 06-15-2008, 09:57 PM #6
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Default Re: red burner diode question

Ok so I added a on/off switch, or rather a off/on switch since whent he button is pressed in, the circuit breaks.
h ttp://img511.imageshack.us/img511/3640/pic0031iz8.jpg
Also I got a pic of the dot from about 2 meters away.
h ttp://img256.imageshack.us/img256/6868/pic0036uy0.jpg
That pic shows the smallest dot I can make.

EDIT
And using some stuff I found around my desk, I managed to put the laser together into one little package.
h ttp://img167.imageshack.us/img167/5817/pic0038yk0.jpg
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Old 06-16-2008, 01:32 AM #7
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Default Re: red burner diode question

Your connections look pretty good I assume the white wire leading to the Aixiz module is the positive wire ? Did you measure the current coming out of it - and if so...how did you do so ?
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Old 06-16-2008, 02:56 AM #8
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Default Re: red burner diode question

Quote:
Originally Posted by SenKat_Stonetek
Your connections look pretty good I assume the white wire leading to the Aixiz module is the positive wire ? Did you measure the current coming out of it - and if so...how did you do so ?
Yes the white wire is +.
I did not check the current... will most likely have to wait until monday till I can get my hands on a multi meter.
Could the current be a factor in why this 'burning' laser doesnt burn?
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Old 06-16-2008, 03:56 AM #9
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Default Re: red burner diode question

Exactly why The only other reason could be death from too much heat while soldering...make sure to discharge the cap prior to testing the current, or disconnecting anything.
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Old 06-16-2008, 04:37 AM #10
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Default Re: red burner diode question

Quote:
Originally Posted by SenKat_Stonetek
Exactly why The only other reason could be death from too much heat while soldering...make sure to discharge the cap prior to testing the current, or disconnecting anything.
Will I be able to discharge the cap by touching it with a screwdriver, or would that be to harmfull to me?
Also what kind of current and I looking for?
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Old 06-16-2008, 08:56 AM #11
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Default Re: red burner diode question

im planning on buiding a red laser and running at around <75mw. do you think it could be focused into the night sky, focusing the beam. beter for your eyes.
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Old 06-17-2008, 05:26 PM #12
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Default Re: red burner diode question

Now you have had some good advice and help I think it is time we discussed......
........ the first spliff laser I have ever seen

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