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Registered Member #2065
Joined: Sun Apr 05 2009, 06:32PM
Location:
Posts: 26
Hi
Does anybody know something about average power of laser diodes in DVD players? How many mA i should give to the diode? I suppose that power of laser diode in each model of DVD can be different.
Registered Member #2065
Joined: Sun Apr 05 2009, 06:32PM
Location:
Posts: 26
DVD-writer laser diodes are very nice (CD-rw diodes too ). This diodes work very well but the high power beam are a disadvantage in some applications. But I have few DVD-player diodes and I want to use it for laser bariers and other low-power laser devices. If the diode are 5mW i think that 40mA will be good.
Registered Member #1262
Joined: Fri Jan 25 2008, 05:22AM
Location: Maryland, USA
Posts: 451
Pylon wrote ...
DVD-writer laser diodes are very nice (CD-rw diodes too ). This diodes work very well but the high power beam are a disadvantage in some applications. But I have few DVD-player diodes and I want to use it for laser bariers and other low-power laser devices. If the diode are 5mW i think that 40mA will be good.
Errrrrrrrrrr
40mA sounds awfully high for 5mW.
Remember that power is equal to voltage times current.
5mW = 40mA * 125mV
I highly doubt your laser is running at 125mV, so this would probably kill it.
IIRC laser diodes want somewhere in the neighborhood of 2V, give or take a bit. Thus, current should be a bit over 2mA for around 5mW.
Edit: just ran a quick search and 2.4v turned up as a common voltage laser diodes run at, 2mA at that voltage is what you need.
Registered Member #191
Joined: Fri Feb 17 2006, 02:01AM
Location: Esbjerg Denmark
Posts: 720
Backyard Skunkworks wrote ...
Pylon wrote ...
DVD-writer laser diodes are very nice (CD-rw diodes too ). This diodes work very well but the high power beam are a disadvantage in some applications. But I have few DVD-player diodes and I want to use it for laser bariers and other low-power laser devices. If the diode are 5mW i think that 40mA will be good.
Errrrrrrrrrr
40mA sounds awfully high for 5mW.
Remember that power is equal to voltage times current.
5mW = 40mA * 125mV
I highly doubt your laser is running at 125mV, so this would probably kill it.
IIRC laser diodes want somewhere in the neighborhood of 2V, give or take a bit. Thus, current should be a bit over 2mA for around 5mW.
Edit: just ran a quick search and 2.4v turned up as a common voltage laser diodes run at, 2mA at that voltage is what you need.
Wrong, you are assuming LDs are 100% efficient. But still 40ma sounds, high, 20 would be about right.
Registered Member #1643
Joined: Mon Aug 18 2008, 06:10PM
Location:
Posts: 1039
You need an 8X DVD burner if your trying to get a burning laser. If you remove it CAREFULLY, and do a simple flashlight hack (as seen on youtube and instructables) you can have a burning laser that will light a match on fire. My experiences with CD lasers failed. Most of them were infrared, and to my camera it wasn't too much power.. I never own a red laser pointer so I cant tell you how powerful. My first laser was a 5mw green, which is 20X brighter than red.
Or, if your like me and don't mind spending, you go to skylasers and buy a 200 dollar 95mw burning laser.
Registered Member #2065
Joined: Sun Apr 05 2009, 06:32PM
Location:
Posts: 26
I have some experience with diodes from cd-rw and dvd-rw (and I have some problems with beam colimation but i think aluminium rail with diode and optic mounted on rail should solve the problem ). For the laser bariers DVD-rw laser diode is not a good idea because it's very dangerous for eyesight (5mW laser diode are relatively safe). And there is a datasheet of 5mW diode: Treshold current- 35-45mA Operation current- 45-60mA And i saw 5mW 635nm laser diode that 35mA operation current 35mA.
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DVD player- laser diode power
). This diodes work very well but the high power beam are a disadvantage in some applications. But I have few DVD-player diodes and I want to use it for laser bariers and other low-power laser devices. If the diode are 5mW i think that 40mA will be good.
). For the laser bariers DVD-rw laser diode is not a good idea because it's very dangerous for eyesight (5mW laser diode are relatively safe).