473 nm
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From: Raymond Yohros on 25 Feb 2010 12:04 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
From: mary on 25 Feb 2010 14:21 "Raymond Yohros" <bat(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.
From: Raymond Yohros on 25 Feb 2010 15:20 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
From: nuny on 25 Feb 2010 17:39 On Feb 25, 9:04 am, Raymond Yohros <b...(a)birdband.net> wrote: > 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? Well, *which* type exactly? Who manufactured the things, and have you contacted the maker(s)? What's the failure mode; no blue at all, reduced power, beam anisotropies (skewing, intensity/polarization variation), how about the IR diode? Do they draw any too little/too much/any at all current from the driving circuit? Did they get really hot just before failure? Do they still get hot when powered? Can you monitor and control the driver current? Mark L. Fergerson
From: Raymond Yohros on 25 Feb 2010 17:55
On Feb 25, 5:39 pm, "n...(a)bid.nes" <alien8...(a)gmail.com> wrote: > Well, *which* type exactly? Who manufactured the things, and have > you contacted the maker(s)? > yes, they are ALL from china. i thoath i could save a few bucks but know im paying the price painfully 4 of them cost me about the same as a one rgb german unit, but the german unit will last for more than 10 years without a problem > > What's the failure mode; no blue at all, reduced power, beam > anisotropies (skewing, intensity/polarization variation), how about > the IR diode? Do they draw any too little/too much/any at all current > from the driving circuit? > > Did they get really hot just before failure? Do they still get hot > when powered? Can you monitor and control the driver current? > no light at all no signs at anytime of malfunction just going blind after a few hours of use suddenly and without dimming out. the current output to the laser its o.k all the 473nm lasers are from the same company and, as you may know, that pretty color its very expensive! regards r.y |