473 nm
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From: bert on 26 Feb 2010 09:22 On Feb 25, 7:58 pm, Sam Wormley <sworml...(a)gmail.com> wrote: > On 2/25/10 2:20 PM, Raymond Yohros wrote: > > > > > On Feb 25, 11:21 am, "mary"<nos...(a)invalid.com> wrote: > >> "Raymond Yohros"<b...(a)birdband.net> wrote in message > > >>news:988d1a4a-5b3b-40d8-ad08-160b7ec67234(a)v20g2000yqv.googlegroups.com.... > > >>> i'm having big problems with this lasers. > >>> i have 6 units and they are all gone. > >>> one with under 4 hours of use! > >>> does anybody know if there is a problem > >>> with production with this type of dpss units? > > >>> regards > >>> r.y > > >> your probably running them too hot. Have big heatsink w heat compound, and > >> run it at low power. > > >> Google is your fiend > > >> In a 473nm blue DPSS laser, there's a BIG infrared laser diode that > >> generates laser light at 808nm, this is fired into a crystal called Nd:YVO4 > >> (containing neodymium yttrium vanadium oxide) that lases at 946nm; this > >> laser radiation is finally fired into a crystal called LBO (containing > >> lanthanum boron oxide) that doubles the frequency to 473nm - the bright blue > >> color you see. This light is then collimated (focused) by a lens and emerges > >> out the laser's "business end". Just before the lens, there's a filter that > >> removes any stray IR (infrared) radiation from the pump diode& Nd:YVO4 > >> crystal. > >> You don't want that stuff in your blue beam, trust me. > > >> This is why blue diode lasers are so much more expensive than red ones.. Lots > >> of itty bitty parts, and they all need to be aligned by hand. If the > >> polarisation is "off", one of the crystals needs to be turned. With red > >> diode lasers, you just slap in the diode and slap a lens in front of it. > > >> PROS: > >> Unique, attention-getting color that's radiant and unusual for a small laser > >> Beam is "clean", with no visible speckling or artifacts around it > >> Powerful enough to burn things; but I'd expect that out of a 120mW+ laser > >> Unique, attention-getting color...o wait I said that already. > > >> CONS: > >> Fragile interior construction - like all DPSS lasers. Will not figure into > >> my rating > >> Not water-resistant - but most other DPSS lasers aren't either. Will not > >> figure into my rating > >> CDRH warning label is not on the laser or its driver. > > > thanks, i did google it but i dont know if there's a > > particular problem with production with this type > > of dpss. i run them all under very cool enviroments > > with fans and battery regulated backups but all > > the units lost the 473nm dpss, while the 532nm > > and the 650nm units are in perfect condition. > > > regards > > r.y- Hide quoted text - > > - Show quoted text - Sam Tied my pen laser to my 357 magnum. That makes me a sure shot. People that lost their house to corrupt bankers should have used a laser magnum gun,and would have a roof over their heads. Our forefathers had guts. I have a brave heart. Bankers 10 People 0 TreBert
From: bert on 26 Feb 2010 09:27 On Feb 26, 12:20 am, jerry warner <jwar...(a)mchsi.com> wrote: > Benj wrote: > > On Feb 25, 7:58 pm, Sam Wormley <sworml...(a)gmail.com> wrote: > > > On 2/25/10 2:20 PM, Raymond Yohros wrote: > > > Sam-bot SOFTWARE glitch! > > > Note "Sam Wormley" bot failed to include comments to post. Please > > debug software. > > can you be sure? To Ya All I built a mechanical laser that uses "white light" It can break a red ballon at 35 feet. TreBert
From: Sam Wormley on 26 Feb 2010 09:41 On 2/26/10 8:27 AM, bert wrote: > > To Ya All I built a mechanical laser that uses "white light" It can > break a red ballon at 35 feet. TreBert That wasn't a laser, Bert. You don't know what a laser is.
From: Sam Wormley on 26 Feb 2010 09:42 On 2/26/10 8:22 AM, bert wrote: > Sam Tied my pen laser to my 357 magnum. That makes me a sure shot. > People that lost their house to corrupt bankers should have used a > laser magnum gun,and would have a roof over their heads. Our > forefathers had guts. I have a brave heart. Bankers 10 People 0 > TreBert You are all set to take on the Severn Trent boys, I see.
From: mary on 26 Feb 2010 09:08
"Raymond Yohros" <bat(a)birdband.net> wrote in message news:dc086271-a5ae-4c08-a672-1f029dfef8cd(a)15g2000yqi.googlegroups.com... On Feb 25, 5:09 pm, "mary" <nos...(a)invalid.com> wrote: > Sounds like you burned them out. > There is a tradeoff of amount of current used vs lifetime of diode (with > correct heat sink). > i know, its about 5000 hours for dpss units and about 3000 hours for ion lasers as a consumer/artist, i just have to see what is the voltage requirement and keep the unit cool. i dont have to open them up to see if they made a mistake building it! > > You should only operate at 1/2 current in anycase. > yeap!, thats what i have to find out if they build them that way! thanks r.y >>>>>>>>>>>>>> It probably has a manufacturing defect, or it is designed poorly. Assume they do. cut down the voltage to a minmum use someone elses. |