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Registered Member #1412
Joined: Thu Mar 27 2008, 04:07PM
Location: Taipei Taiwan
Posts: 278
I disassembled at least 8 CD-RW and DVD-RW burner and finally get a working laser diode. I attached a lens from a cheap 5mW laser module to it and power it at 3V 320mA.But I cannot see a visible beam like those youtube videos.I even cannot see the beam even at almost complete darkness.Why?
I haven't try to light a match yet.But I guess the laser output is at least 100mW (3*0.33=0.99,almost 1W electric power input)Why I cannot get a visible beam at this power?
Registered Member #3950
Joined: Wed Jun 15 2011, 12:45AM
Location:
Posts: 51
I'm guessing that you gave the laser diode too much power and it broke. Laser diodes can overheat and break very quickly when not mounted on a big heatsink.
Registered Member #2628
Joined: Fri Jan 15 2010, 12:23AM
Location:
Posts: 627
It could well be running <100mw. 660nm itself isn't too visable to your eye, for myself I need at least 200mw in total darkness to see the beam.
Those current readings seem reasonable for a 20X/22X (for example, LPC-815, that has a Vfwd of 2.5V-3V, Ive seen them run in the higher limits of 400ma)
Got some pictures of the diode, sled and maybe drive it came out of?
Another thing is you could have cause damage to the diode in some way (with how fragile they are, there is a lot of factors). Jnbrex stated, you definatly need a proper heatsink, a bare diode will crap out in seconds without one.
Registered Member #1412
Joined: Thu Mar 27 2008, 04:07PM
Location: Taipei Taiwan
Posts: 278
I know laser diodes can overheat easily,but I cannot find a suitable heatsink.So I only turn it on for several seconds.When I found the casing is hot,I turn it off.
I cannot find any laser diode here in Taiwan at reasonable price.(But there are a lot of high power green laser pointer)
Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4059
Its too late by that point, the damage has been done. Guess how I found that out 30mW blue 405 HD-DVD, toast. Seems that excess heat accelerates degradation of the facet making COD that much more likely and even more so if the can has been removed as some people do if the window is cracked during removal.
405 burner diodes seem to be a bit more robust, mine got literally too hot to touch numerous times and no apparent loss of power or facet damage. I even reverse bias pulsed a shorted one to unfry it and it recovered 3% power (!)
Registered Member #561
Joined: Sat Mar 03 2007, 02:46AM
Location: Adelaide Australia
Posts: 230
hsieh wrote ...
I know laser diodes can overheat easily,but I cannot find a suitable heatsink.So I only turn it on for several seconds.When I found the casing is hot,I turn it off.
I cannot find any laser diode here in Taiwan at reasonable price.(But there are a lot of high power green laser pointer)
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DVD burner laser diode
30mW blue 405 HD-DVD, toast.