On Friday 06 December 2013 13:46:26 Florian Rist did opine: > Hi Gene > > > So my question is, to someone who may have tried/done this, is can a 1 > > ounce layer of copper be burned away rapidly enough so as not to leave > > a burned, conductive path where the copper was? > > I tried this with two different Lasers sources: > > 120 W CW CO2 Laser at 10600 µm wavelength: > Result: no way to 'burn' the copper. It was hardly possible to burn away > a the play of photosensitive coating used in the normal 'wet' process. > > 200W q-switched Yb:Yag Laser at 1064 µm: > Result: even the 25 kW max. pulse energy were not sufficient to burn > away the copper properly. It is possible to cut through the coper layer > by the precess is not controlled enough. The pulse energy would probably > have to be at least 10 times higher to establish a decent process. But > this laser removes the light sensitive coating quite well at low power > settings. > > > I ask because I have 3 or 4 old dvd writers that no longer write a > > usable disk, although the written area can be seen on the throwaway > > disk. Pack rat that I am, I haven't binned them yet. > > No way to affect the coper layer with a diode from a DVD writer, but is > should be possible to expose the light sensitive coating using a low > power blue LED. So this could eliminate the traditional exposer > processes but you would sill have all the rest of the wet process.
Something that since I have extensive experience with, and the destruction one can cause trying to dispose of spent ferric chloride, I do NOT want to be involved with ever again. > > See you > Flo > > ------------------------------------------------------------------------ > ------ Sponsored by Intel(R) XDK > Develop, test and display web and hybrid apps with a single code base. > Download it for free now! > http://pubads.g.doubleclick.net/gampad/clk?id=111408631&iu=/4140/ostg.cl > ktrk _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> Formatted to fit your screen. A pen in the hand of this president is far more dangerous than 200 million guns in the hands of law-abiding citizens. ------------------------------------------------------------------------------ Sponsored by Intel(R) XDK Develop, test and display web and hybrid apps with a single code base. Download it for free now! http://pubads.g.doubleclick.net/gampad/clk?id=111408631&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
