473 nm
Raymond Yohros
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
mary
"Raymond Yohros" <b...@birdband.net> wrote in message
news:988d1a4a-5b3b-40d8...@v20g2000yqv.googlegroups.com...
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.
Raymond Yohros
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
alie...@gmail.com
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
Raymond Yohros
> 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
Sam Wormley
> On Feb 25, 11:21 am, "mary"<nos...@invalid.com> wrote:
>> "Raymond Yohros"<b...@birdband.net> wrote in message
>>
>> news:988d1a4a-5b3b-40d8...@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
mary
>regards
>r.y
Sounds like you burned them out.
There is a tradeoff of amount of current used vs lifetime of diode (with
correct heat sink).
You should only operate at 1/2 current in anycase.
Who is manufacture?
How much current are you using? (please measure)
How hot is the device getting? (measure near base)
Raymond Yohros
> 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
Benj
> 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.
jerry warner
Benj wrote:
can you be sure?
bert
>
> - 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
bert
To Ya All I built a mechanical laser that uses "white light" It can
break a red ballon at 35 feet. TreBert
Sam Wormley
>
> 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.
Sam Wormley
> 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.
mary
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.
Quadibloc
> People that lost their house to corrupt bankers should have used a
> laser magnum gun,and would have a roof over their heads.
Yes, but it wouldn't be in their homes, since it isn't wise to have an
address where the police know where to find you when you shoot at
bankers who have the law on their side.
Our forefathers did have guts, but they weren't stupid. Today, we
still have the freedom they fought for. Vote in a government that
doesn't let banks get away with this kind of nonsense. That is the
answer.
If you only vote for the politicians who can afford big TV ads, you
will only get the politicians that get campaign contributions from big
business. If you don't apply sound analysis even to your voting
behavior, I have little hope that you will successfully work out the
tactics of an armed rebellion.
John Savard
Raymond Yohros
> It probably has a manufacturing defect, or it is designed poorly.
> Assume they do.
>
> cut down the voltage to a minmum
>
> use someone elses.
>
absolutely, i was seduced by the low price they had
and now and totally discust by the result.
i will return to my original laser provider from
germany who was a pioneer on air cooled solid
state systems and is the best in the industry.
i bought one of the first of his designs
a very long time ago and it still works beautiful.
regards
r.y
Pierre Vandevenne
> People that lost their house to corrupt bankers should have used a
> laser magnum gun,and would have a roof over their heads. Our
Yup. It is usually called "prison".