Old 08-15-2010, 05:12 PM #1
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Default thank you to all member and at rayfoss...awesome purchase.

OLD POST- new post to read.. under this.

hello boys... after 2 hours i wil delete this post. but i urgently need an help to decide if add an ir filter or not in a laser that i am purchasing from rayfooss. it is an handeld laser.. tested stable about 330.. peak 355....

now before shipment i should choose if faona add an ir filter or not. she said me this will cause 15%-20% power lose.

so.. 20% of 330 is 50mw. 280mw of pure green.

i dont' know what to do... because for many reasons i should KEEP for alot of time this laser.... i spend money.. and at this power i am stopping to buy others greennies.... so i like TO BURN... and maybe IR can help me to be happier with my purchase.....

however.. i don't know if IR are REALLY a problem for eyes... but i think not.. because i only point at sky or wall not so much near to me...

however i don't know if adding an ir filter could WORSEN the beam quality and divergence....

i don't know if the filter is well made or could change the qquality of the beam....

---------------NEW POST to read----------------

i received from faona this email today. about this laser
www.rayfoss.com

"We have finished the laser with IR this morning. After testing the power output is in range of 255mw-275mw.
But I found after add IR lens the aligment has some changed there have a 10dgC angle...not so straight.I talked with engineer they told this is normal as the internal construction of this torch has not left too much space for IR lens so the crystal might changed a little forom their original position. I dont know if you can accept this! To build new one need 1 week time. As all of our stocked item is without IR lens on this torch.

If you can not accept this...Could you please consider this type: www.rayfoss.com ? We have a stock as well. This is pure green. Pre-installed the IR lens. For the time componsation we would give you a big discount...i.e. You just need pay 15usd price difference is ok. Please consider and let us know your idea in return!"

so : for 15$ should i change the model?(for 230 instead 295$)
did the crystal in the FGB
...... i notice the "old" model i ordered is at 60sec duty circle.. the new at 300sec. and ....

i read CIRCUIT = ACC on the old.. and CIRCUIT = APC in the new.
what's the difference bewteen apc and acc circuits?

is that new laser THE SAME sold by skylasers?
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Last edited by realista; 08-22-2010 at 05:37 PM.
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Old 08-15-2010, 05:20 PM #2
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Default Re: ULTRAFAST QUESTION (max 2hours). IR filter or not?i must choose NOW

think of it in terms of a 50mw IR with no protection.. You are going to be burning shit up close with red goggles to stop the green, does nothing for IR. So 1 bad reflection and you got some eye burns. Seems like an easy decision to me, get the filter and save your eyes.
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Old 08-15-2010, 05:25 PM #3
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Default Re: ULTRAFAST QUESTION (max 2hours). IR filter or not?i must choose NOW

Yes You need the filter!

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Old 08-15-2010, 05:27 PM #4
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Wink Re: ULTRAFAST QUESTION (max 2hours). IR filter or not?i must choose NOW

I will suggest to choose the filter, too ..... an undamaged eye worth always a lot more than a small reduction in power .....
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Old 08-15-2010, 05:32 PM #5
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Default Re: ULTRAFAST QUESTION (max 2hours). IR filter or not?i must choose NOW

"however i don't know if adding an ir filter could WORSEN the beam quality and divergence...."

An IR filter will not affect the beam quality in any way, unless the person who installs it gets finger prints on it or worse scratches it.

Other than that its a must if you plan on burning things with single wavelength goggles that protect from 532nm only...
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Old 08-15-2010, 05:38 PM #6
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Default Re: ULTRAFAST QUESTION (max 2hours). IR filter or not?i must choose NOW

ok thank you very much.. i did not think about goggles...... i forgot they only stop green... and let pass 50mw of light that is not so much. aven if... 50mw are with HUGE divergence.. and not concentrated like normal lasers... but yes... you are right...

now i rely by mail to faona that i would the filter... thank you!

"An IR filter will not affect the beam quality in any way" i HOPE ..
my fear is that ir lense are not high quality and could minimallu change the beam... and that could be 0.2..0.4 mrad more...
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Old 08-15-2010, 05:39 PM #7
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Default Re: ULTRAFAST QUESTION (max 2hours). IR filter or not?i must choose NOW

I would choose to not have the filter. 280mW is not going to go easier on the eyes than 400mW+ (and it's unlikely there is that 100mW+ of IR anyways).

IMHO IR filters for hobbyists are only needed in lasers that are designed to hit the eye, such as show lasers during crowd scanning.
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Old 08-15-2010, 06:01 PM #8
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Default Re: ULTRAFAST QUESTION (max 2hours). IR filter or not?i must choose NOW

i know that also 280mw can damage eyes.... BUT if i burt things and see throught red glasses.... the ir light is not blocked by glasses....

do you think that and IR filter could also block a little of green?
i've heard this.. but i think it happens only with HIGH QUALITY filters.. over98%....

rayfoss should have cheap filter of 90%95% i think...
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Old 08-16-2010, 02:53 AM #9
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Default Re: thank you for the replies about ir filter

One pair of goggles will NOT stop 1064nm and 532nm wavelengths at the same time.

Option #1:
If you are not worried about 50mw of 1064nm reflecting really close to your face (where you will be doing the most burning) then don't get the IR filter.

Option #2:
If you are worried about 50mw of unfiltered infra-red light that can permanently damage your eyes.. GET THE FILTER.
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Old 08-16-2010, 03:14 AM #10
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Default Re: thank you for the replies about ir filter

They do make goggles that block 532nm and 1064nm at the same time. They're just not that common.
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Old 08-16-2010, 04:08 AM #11
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Default Re: thank you for the replies about ir filter

For some reason people tend to think that the IR leaving a DPSS laser 'diverges too quickly and is harmless', this is not always the case.

I built a 532nm labby a while back, here is a quote from post #9 in that thread and the link below. Take it as you may... This was a laser that at first hit only 200mW and after some fine tuning was up to 300mW.

Quote:
Originally Posted by wannaburn View Post
I also noticed a very interesting thing in regard to IR. While tuning and getting things right, I decided to see how the IR leakage looked with no filter in place. Well I found some scary stuff, with a 0 LUX Sony nightshot cam and a 532nm filter in front of the laser; the IR can be seen 30ft away in the form of a 4in dot! Im not sure which IR this is, but im guessing the 1064. While the IR may diverge at a different rate, it is still present at the end of the beam. I am going to repeat the same test, but in addition to the 532nm filter im going to also place an 808nm filter in the path of the beam and see if this IR spotlight is still on the wall.
http://laserpointerforums.com/f45/20...ump-30923.html
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Old 08-16-2010, 01:06 PM #12
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Default Re: thank you for the replies about ir filter

generally IR have very high divergence.... most of laser pointer unfiltered.....if metered with a LPM change the power if you read it at 3cm... 7 cm... 10 cm... 15 cm... 30 cm... and the dot is STILL enterely pointing in the SENSOR.
so much difference is because ir have big divergence in most of cases.

your build is nice
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4- 80mw bluray PEN from olike, NEGATIVE divergence focus point at about 2meter (good) and divergence of LESS THAN 0.5mrad for sure.
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Old 08-16-2010, 04:19 PM #13
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Default Re: thank you for the replies about ir filter

Get the filter. You can always remove it if you aren't happy with it. Plus all the safety reasons above.
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Old 08-16-2010, 04:33 PM #14
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Default Re: thank you for the replies about ir filter

Quote:
Originally Posted by Prototype View Post
They do make goggles that block 532nm and 1064nm at the same time. They're just not that common.
I suggest to get these multiple wavelength goggles (42 USD free shipping)

532 OD 4
808 OD 2+
1064 OD 4+

Multiple Wavelength
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Old 08-17-2010, 03:29 PM #15
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Default Re: i need another URGENT help about choosing rayfoss handheld.i must reply her

here finish old replies about ir filter...... now starts repiles about what kind of model to choose.
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3- 50mw bottle shape from FOCAL...1.2 mrad, not estimated power 40/60mw in winter. 20/30 in summer ;(. nice design.
4- 80mw bluray PEN from olike, NEGATIVE divergence focus point at about 2meter (good) and divergence of LESS THAN 0.5mrad for sure.
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Old 08-17-2010, 03:42 PM #16
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Default Re: i need another URGENT help about choosing rayfoss handheld.i must reply her

I'd surely upgrade for that price, I have the 200mW focusable from SkyLasers and I love it, mine has a 3mm beam @ aperture and a .88mRad when focused to infinity, it's a great laser.
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-~200mW New Style Dilda (650nm)
-~5mW DX pointer (650nm)
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