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Old 04-16-2010, 10:16 PM #1
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Default WTB: blu ray player diode

I would like to buy a blu ray players diode for a 5mw laser I plan to build. If anyone knows were I can find any of these or could sell me one that would be great.
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Old 04-16-2010, 11:04 PM #2
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Default Re: WTB: blu ray player diode

I dont know anywhere you could buy a diode thats only 5mw. You could just get a complete 5mw one off ebay
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Old 04-16-2010, 11:32 PM #3
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Default Re: WTB: blu ray player diode

Sorry I should edit that.
I'm looking for one capable of 5mw by running the current low enough but not a phr.
More like a weaker verion of a phr from a normal blu ray player

And I want to build it myself
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Old 04-16-2010, 11:34 PM #4
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Default Re: WTB: blu ray player diode

hmm I think there's a diode that will output between 10 and 20mw... might be the one from the ps3 sled not sure about that though
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Old 04-16-2010, 11:49 PM #5
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Default Re: WTB: blu ray player diode

The cheapest way would be by using a PHR at low current - at 35-45mA you'd get around 5mW. Alternatively, you could kill a PHR and run it at much higher current, to give a lower output. The PS3 sled alternative is expensive, but you get a "3 in 1" violet, red and IR diode, all capable of up to maybe 25mW or so.
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Old 04-17-2010, 12:00 AM #6
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Default Re: WTB: blu ray player diode

IIRC PHRs dont start to produce any light until around 25 or 30mw, so that wouldn't work.
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Old 04-17-2010, 12:32 AM #7
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Default Re: WTB: blu ray player diode

Yeah the ps3 diodes are like $35 so that isn't really an option
So is there no economical way to make one of these?
Has anyone ever done this before?
Thanks again
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Old 04-17-2010, 12:36 AM #8
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Default Re: WTB: blu ray player diode

Nope why dont you buy a 5mw laser off ebay if you really want one, and build a PHR if your so interested in building one?
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Old 04-17-2010, 12:40 AM #9
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Default Re: WTB: blu ray player diode

just an off topic question but will a say 5-50mw blu ray still make glow in the dark stuff light up supper bright?or do you need 100+mw?
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Old 04-17-2010, 12:44 AM #10
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Default Re: WTB: blu ray player diode

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Originally Posted by yobatts View Post
just an off topic question but will a say 5-50mw blu ray still make glow in the dark stuff light up supper bright?or do you need 100+mw?

doesn't matter what the power is.. a blu-ray of 1mW would still light up GITD items.
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Old 04-17-2010, 01:21 AM #11
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Default Re: WTB: blu ray player diode

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IIRC PHRs dont start to produce any light until around 25 or 30mw, so that wouldn't work.
The laser doesn't "start" at a power level, it has what's known as a lasing threshold, at which point it starts producing laser light. This is generally about 30-40mA for PHR diodes, but varies from diode to diode, and with temperature. From here, the light intensity increases about linearly with current (slope efficiency), so it is possible to set a PHR diode at around 5mW - just start with the current down below lasing threshold, then slowly turn it up, until lasing threshold, then up it by just a few mA beyond, and you will be at around 5mW. Remember that this takes relatively high precision, and turning the driver too far risks killing the diode. The other option is to kill your PHR with high current, thus, a high current will produce a lower amount of output power, and more wasted heat, but also make the power slightly more easy to control. If my aim was to produce under 10mW of 405nm light, I would do as I described above.

What's this for?
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Old 04-17-2010, 01:26 AM #12
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Default Re: WTB: blu ray player diode

Oh yes your right sorry I just got my mw and ma mixed up trying to remember the graph
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Old 04-17-2010, 02:47 AM #13
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Default Re: WTB: blu ray player diode

I have built many low powered pointers with PHR diodes.

You can also use a DT-0811 sled or a SF-AW115 sled.

FOR Xbox 360 HD-DVD DT0811 LASER LENS REPAIR DT 0811 US - eBay (item 300394554424 end time May-07-10 20:05:27 PDT)

Look for "broken" PS3 sleds for affordability


IIRC you will have to either build your own driver or use a Rkcstr in the low range.

Peace,
dave

**EDIT** You can also use the new Groove 2
http://laserpointerforums.com/f39/in...ser-49907.html
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Last edited by daguin; 04-17-2010 at 05:39 AM.
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Old 04-17-2010, 04:02 PM #14
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Default Re: WTB: blu ray player diode

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Originally Posted by charliebruce View Post
The laser doesn't "start" at a power level, it has what's known as a lasing threshold, at which point it starts producing laser light. This is generally about 30-40mA for PHR diodes, but varies from diode to diode, and with temperature. From here, the light intensity increases about linearly with current (slope efficiency), so it is possible to set a PHR diode at around 5mW - just start with the current down below lasing threshold, then slowly turn it up, until lasing threshold, then up it by just a few mA beyond, and you will be at around 5mW. Remember that this takes relatively high precision, and turning the driver too far risks killing the diode. The other option is to kill your PHR with high current, thus, a high current will produce a lower amount of output power, and more wasted heat, but also make the power slightly more easy to control. If my aim was to produce under 10mW of 405nm light, I would do as I described above.

What's this for?
Thanks I think ill try that out.
What do you mean "you risk kill ing the diode" do oyu mean I could turn the pot to far or do you mean there's a way to kill it when going from led to laser?

This is for a friend who just want ed a blue pointer in a marker with out using enough power to hurt his eyes to quickly.

Thanks to dave too the groove looks good.
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Old 04-17-2010, 04:13 PM #15
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Default Re: WTB: blu ray player diode

Yes, you can turn the pot to high, and kill the diode. What you wanna do is turn the pot all the way down to where it's barely lasing.
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Old 04-17-2010, 04:52 PM #16
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Default Re: WTB: blu ray player diode

Yeah I knew that I was just varifying there was not some other way to kill the diode w/ the pot. Thanks though
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