Most users ever online was 11 on Wed Nov 08, 2006 3:13 am.
Let us beat this ?
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Most users ever online was 11 on Wed Nov 08, 2006 3:13 am.
Let us beat this ?
I saw 6 one time... I think we're too spread out on the globe... Although I work nights and jump on once or twice an hour at work... Once I get my DAC I may never leave... :roll:
O, O... :shock: we got 6 on right now... no one leave... :D
O!!! up to 8... :P :lol:
Damn... Back to 3... :roll:
Ewww... 10 of us on here!!! :roll: :wink:Quote:
Originally Posted by allthatwhichis
:idea: :idea: :idea:
500th user has registered!!! and this is my 100th post!!! :roll: Yay!!! I guess... :wink:
And 300+ of them are just joey accounts with porn or drug websites :(
Jim
O, damn... pisses on that huh? :roll:Quote:
Originally Posted by JimBo
WOW! 16 people! A new Record!!! YAY! :D :wink: Happy Thanksgiving!
yes,that's right!
here in China, it's 13:56, but it will be night in us!
Are there REALLY 39 guests on right now???! Come on ya'll sign up and be REAL people... :P
Yep, Hackaday.com linked here... nice bit of traffic coming in. ;)
I love HackaDay :) cool site
what is hackday ?
It is a website that features short articles talking about other websites that display cool projects. (Hacks) Things like computer case mods, modifying a toaster to make a heater for your car, and making the worlds first 405 nm, 20 mw laser pointer. (Guess which one is actually a thread on PhotonLexicon that someone submitted to hackaday?)Quote:
what is hackaday?
Check it out: http://www.hackaday.com/
Adam
PS: It's sort of like Digg.com, or Slashdot.org. Just on a smaller scale. Cool stuff though
Heh... no bodys here and I took over... :wink:
All day long and no one has posted??? :?
I noticed that too; I was starting to wonder if something had happened to the forum...
I just bought most of my stuff; DT-40 Pros from Jian, AlphaliteXC Pro from Rick at laserillusions, and a pre-varianced projector casing! :twisted: Now I just need to seal the deal on a laser.
Nice! What powers are you going for?
I'm in and out all day, 24/7.
Jim
Got a Lasever analog 532nM here if your interested.Quote:
Originally Posted by BoomDog
I'm gunning for a 532nm 1w; talking to nono-shen right now and she offered it for $1900 w/ shipping but my concern is that there isn't an IR filter on the model by default, so I'm still thinking about it and weighing my options.
What power and how much are ou asking? PM meQuote:
Originally Posted by Spec
Fred
A 1w without a IR filter is sheer stupidity in my mind. Ask to have a IR filter fitted, or don't buy a laser without one.Quote:
Originally Posted by BoomDog
I was going to say... 1W of green w/o a filter could be .5 W green .5 watt of IR. I know I'd be hard pressed to tell the difference.
Can a green laser NOT have an IR filter and still NOT... expell any IR radiation? :?
I asked her to try it, but i doubt i'll be getting the results I want. This is def not the first time I've heard how much of a change IR can cause in a laser. Next I might be looking at buying a laser from Aijii/Dave, but I'm giving Nono-shen a chance to see what she can do at least.
Selling without an IR filter is Stupid, dangerous and Deceiving in my opinion.... If it cannot be verified that it has one, DONT BUY! The Chinese manufacturers will get the message and start to install them....
Lightglow has 1watt from nono-shen. But I dont know if it is with or without IR filter:
I hope it is with IR filter since I will order one from her.
No ir filter, no deal!
But I guess it has IR filter! ;)
UPDATE:
I talked to liteglow and he says it has IR filter! ;D
Yea I PMed him about it; perhaps the difference was that he ordered a "1.2 watt" laser while i'm looking at the 1 watt. Another concern was that his had the wrong sticker on it; which is very concerning since A. I'm going to get the thing varianced, and B. the variance rep of my region lives 20 minutes away! :lol:
well he orderd a 1watt system. ;)
Hmm... lol well there was still a class IIIb sticker on it :lol:
WOW, Wrong sticker and NO IR Filter....Hmmmm.....
No.Quote:
Originally Posted by allthatwhichis
If you don't have an IR filter on a DPSS laser, it *WILL* expell IR radiation. Lots of it. Both 808 nm and 1064 nm. And with a laser that is capable of making 1 watt of visible light at 532 nm, there is going to be a HELL of a lot more IR radiation inside the cavity. (At a minimum, the pump diode is probably making 5-6 watts of 808 nm, and you can count on at least 2 watts of 1064 coming out of the vandiate crystal.)
Even the lowly 5 mw green laser pointer has enough intra-cavity IR that it needs an IR filter to be safe. Now multiply that by a factor of 200, and you can see why selling a 1 watt DPSS laser without an IR filter is irresponsible and dangerous. Carey is right. Don't buy one if it lacks the filter.
Adam
I believe that it should be a standard part for any laser or at the very least a free addition if you ask for it.
Assuming chinese manufacturers are anything like they were a couple years ago, they will try to charge you extra for it if its not already there.
Depending on the price they are asking it might be cheaper to buy a leadlight and rip the IR filter off those, though I hope you can find one that wont involve the hassle.
Ask for "HR808,HR1064,HT532 optic". They are usually good about understanding the HR, HT, AR lens designations.
Yea, she hasn't mentioned a price (or hasn't even gotten back to me since I messaged her a few days ago about trying out a laser after putting an IR filter on), plus I'm still worried about that sticker label (seems a little suspicious to me). My main concern though is that putting an IR filter on will decrease the actual power reading down to where the green light is actually at. In otherwords, I'm worried about not getting 1 watt of green, and instead getting 1 watt of green + IR.
there is a IR filter on my laser !
And yes I did order a 1Watt laser.
But on the 24hour test the laser did reach 1.2Watt at full power :)
And yes it`s only marked as a 3B laser !
And the reason for that is that a 3b is the ONLY laser I can get into Norway!!
Class 4 laser is very illegal to use....
Thats true! Need special permit to usa class 4 lasers in Norway!
I'm just basing the IR thing of of what she said; though at least I understand the sticker situation...
I just wish she would reply to my email or PM after 3 days :P
Its not like them to turn down money...
She should be back online this evening(accounting for time change) I'll lodge a request then.
So what is so dangerous without IR filter? What can happen ? A 1watt system witout ir filter has less power than with ir filter?
High levels of IR light are more likely to cause retina damage more easily if i remember correctly, and a 1W will have very high levels
Edit:
Interesting link: http://www.ehss.vt.edu/Programs/OHIH...am_hazards.htm
IR within a beam can manipulate a lasercheck reading. If the meter is set to, say 532nm, and a pure green 1 watt laser is shot into it, and then a visually dimmer and less powerful green w/ enough IR, the meter will output relatively the same power. Obviously if a spectrometer is used, you can tell the difference, but my worry is that I will not be getting 1 watt of green. Most 1 watt green lasers w/ IR filters actually would supposedly emit >1.5 watts to a normal power reader without the filter, but the difference is excess IR and is not visible.
Not to mention, IR is more dangerous to not only your eyes, but your skin as well, as it is absorbed by many more materials than any visual color. In essence, IR is sometimes referred to as heat energy, just because of it's excellent ability to be absorbed and converted to heat. That means it can fry your eyes that much quicker. Plus, I plan to use this in public events, and I believe in the US it is required to have an IR filter on a laser meant for such things.
thats really bad!
Thanks for the update!
I am here , about the laser with IR filter , I must say something . laser with IR filter is necessary,every laser must add filter , without filter will be dangerous , no matter the worker or the customer . if it is without filter isnot the eligibility. the problem is depend on the quality of the filter , the better filter will get the less out put . lasers no matte which in any company , will out put some IR light , CNI and other company is the same .
Yep this is very true; there is never such thing as a perfect optical device, and IR filters certainly fall into this category. Nono-shen, good to see ya again; sent ya another PM responding to your last message. :P
Oh, BTW cruch, sorry I totally hijacked your thread :oops:
Alright, looks like I found my laser; I'm wiring the money over this week, after nono-shen mentioned an additional IR filter will be installed. Rather be safe than sorry, particularly if I'm using this in public. She was gracious enough to quote me the price of a normal filter, so THANK YOU! Can't wait! :P
She also confirmed that she would be sending the class IV sticker, in case anyone was wondering, though that was already figured out here obviously. Plus my DT-40's, AlphaliteXC Pro software/interface, and pre-varianced projector casing is all shipping out at some point this week. I'm going to have waaay too much fun next week!
early crismas gift!!! hehe
I will also order an 1 Watt green laser from nono. Since it has IR filter.
Then...is it
1 Watt with IR filter
or
1 Watt without then adds IR filter? will it be less power then?
I have read that laser with IR filter is 10-20% higher power than without. True?
so a 1watt is only 800mw with IR filter? and 1watt witout...
Sounds reasonable, I'm not very sure though. Normally, manufactures measure the power with an IR filter installed (or at least the honest manufactures do). So a 1 watt green with is probably 1.2 to 1.3 without; though I have heard of larger leaks than that.
Glad to see that Nono Shen agrees with us that IR filters should always be installed on DPSS lasers. Her post (above) is right on the money, and is essentially the same thing we've all been saying: Lasers without IR filters are dangerous.
Cruch: To answer your earlier question, if a DPSS laser does NOT have an IR filter, then the laser output will register higher on a power meter. This is because the leaking IR will cause the sensor to respond just as the visible beam does. (Actually, the sensor response is not linear with changing wavelengths. At some IR wavelengths the sensor might be twice as sensitive as it is to green light.)
If you buy a 1 watt laser, that should be 1 watt at whatever wavelength the laser is rated for. (532 nm, 473 nm, etc.) If there is IR present in the beam, then you have a problem and need to install an IR filter. But in no case should the leaking IR be included in the 1 watt. To do otherwise is dishonest. Yet, some manufacturers do include the leaking IR power in with the total output power figure for their lasers. It would be wise to avoid such unscrupulous vendors.
As for how much IR could be leaking in a laser that lacks an IR filter - that's more difficult to predict. A 1 watt laser will normally have between 5 and 7 watts of pump energy at 808 nm. Depending on the quality of the optical coatings inside the lasing cavity and the efficiency of the vandiate crystal itself, you might expect to see 500 mw to 1 watt of that pump IR leaking through. Then there's the 1064 nm IR that manages to leak past the frequency doubling stage. You usually will have almost double the 1064 nm power as you end up with in 532 nm output. So, once again depending on the quality of the optical coatings and the efficiency of the KTP crystal, you might see another 250nm to 500 mw of 1064 nm IR. (Remember that the efficiency of the frequency doubling process can be greater than 50%, whereas the conversion of 808 nm pump to 1064 nm IR is generally around 30%.)
However, if you have a 1 watt DPSS laser and you remove the IR filter, you may well only see an increase of a few hundred milliwats of power due to leaking IR, *IF* the laser has exceptional optical coatings. (Because good optical coatings inside the lasing cavity mean that more IR stays inside the laser, where it's working to make more light, rather than leaking out and being lost.) But on less-expensive models, you might see the power reading *double* when you remove the IR filter. That's because at some point it's cheaper to make the pump diode larger than it is to install better optics to reduce IR leakage.
But in any case, the final IR filter is always a must. The output beam shouldn't have more than a few mw of IR.
Adam
Thanks for the info! I do understand now. ;)
We should set sticky tread on IR filter or something. For all other newbies...just like me... ;)