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Old 03-18-2009, 09:27 PM #1
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Default ALL Wavelegnth glasses .. . an exercise in WHAT IF

I had this thought .. for an all wavelegnth set of glasses..


Can 2 or three different wavelegnth protection lenses be "sandwiched" together so that lets say the first lens allows 405nm though but the second lens catches it..

then for a red it gets caught in the first lens and never makes it past and other wavelegnths are caught by their respective lens in the layer..

anyone think its doable?




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Old 03-18-2009, 10:14 PM #2
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Default Re: ALL Wavelegnth glasses .. . an exercise in WHA

If you block all wavelengths of light what is left to see? Even if they were only "partial" blocking I'd think layers sandwiched together woudl make the VLT unbearably low.
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Old 03-18-2009, 10:19 PM #3
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Default Re: ALL Wavelegnth glasses .. . an exercise in WHA

OEM laser systems sells multi-wavelength goggles, check out their website. *I seem to remember the all-wavelength goggles not having enough protection for very powerful red lasers, but you can look on their website to see.

I personally have a set that covers green to UV and everything in between, from 532nm down to (I think, but not positive) 180nm wavelengths. *It's the AL2 I think, and they make others that cover multiple wavelengths.

Keep reading in this section, there is info already posted about multi-wavelength goggles and what to look for when shopping for goggles, including the overall transmission figures.

ETA: Read down on the first page in this section, there's a thread on the first page for exactly this question. *And one correction, you're not going to get goggles that cover EVERY visible wavelength, but you can get goggles that cover MULTIPLE wavelengths, and you can get those goggles to cover the wavelengths for the lasers that you own, such as the pair I have that covers me for both green and violet lasers that I own (I have a different pair for reds that I already had beforehand).
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Old 03-18-2009, 10:44 PM #4
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Default Re: ALL Wavelegnth glasses .. . an exercise in WHA

"such as the pair I have that covers me for both green and violet lasers that I own (I have a different pair for reds that I already had beforehand). "


I should have been more clear in that :

An AFFORDABLE pair of glasses that covers what your two pairs do , in one.. for us entusiasts.. most common wavelegnths that we try to protect our eyes from..

Red / Green / Blue-ray

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Old 03-19-2009, 01:22 AM #5
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Default Re: ALL Wavelegnth glasses .. . an exercise in WHA

Quote:
Originally Posted by MixManSC
If you block all wavelengths of light what is left to see? Even if they were only "partial" blocking I'd think layers sandwiched together woudl make the VLT unbearably low.
I have goggles for 190-532nm, and for 600-850nm. I can wear them both at the same time, and see reasonably well. I think that if a company sandwiches these together, then it would work. Of course the VLT is low, but it's just like wearing sunglasses.
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Old 03-20-2009, 01:03 PM #6
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Default Re: ALL Wavelegnth glasses .. . an exercise in WHA

You wouldn't sandwich glasses, but just mix different dyes into one set of glasses. Since dyes generally absorb over a wide frequency range, that will affect the VLT (visual light transmission) and the color rendition. If you've got lots of money, you can also get glasses with custom interference coatings that block only one or more narrow wavelengths (one for each laser frequency); these would offer high protection with minimal light blocking.

I've looked for all-purpose (violet, green, red) goggles; it seems only the ML7 type fits the bill. It's borderline for 660nm red. It's available from OEMlasersystems (frothychimp) for about 140$ using the discount code posted here in the forum.
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Old 03-20-2009, 01:41 PM #7
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Default Re: ALL Wavelegnth glasses .. . an exercise in WHA

I ran a group-buy last summer for some of the &quot;ML-7's&quot; from OEM Laser Systems.
http://www.laserpointerforums.com/fo...m=1217790369/0
They are perfect for the laser-hobbiest. They protect against all of the &quot;common visible-wavelengths&quot; of laser-systems that we would be using here, plus IR and UV. You can view the spec's here:
http://store.oemlasersystems.com/ind...products_id=44

I highly recommend these goggles. While there was some question by a GB-participant last year as to whether the OD-1.8@ 650nM would be enough for high-power reds, it certainly is perfect for me, I will let someone else calculate the power of a 300mW-red hitting the lens directly, but it should be under 10mW. If I understand correctly, they are also &quot;certified&quot; for 405nM now, same lenses, they were just working of the certification last summer, so maybe they will change the name to ML-8s now .

While they cost most more than most, they have great VLT for multi-wave lenses and are cheaper than buying seperate goggles. Not to mention, they are a must if you are dealing with multiple wavelengths at once, such as DPSS or gas-lasers.
Hope it helps
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Old 03-20-2009, 03:12 PM #8
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Default Re: ALL Wavelegnth glasses .. . an exercise in WHA

The specs read OD&gt;1.5 (1:30 reduction) up to 655nm. However, the LPC-815 wavelength is 660nm, so it will be less. Even with the goggles, you might be getting in excess of 20mW, which is far too much for safety. But generally you wouldn't be looking straight into the beam; and it should be sufficient for stray reflections, unless it's from an optical-quality mirror.
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Old 03-22-2009, 07:52 AM #9
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Default Re: ALL Wavelegnth glasses .. . an exercise in WHA

You can get some great material for blocking all wavelengths, even gamma rays right here, though they may need some machining for use with goggles.
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Old 03-22-2009, 08:12 AM #10
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Default Re: ALL Wavelegnth glasses .. . an exercise in WHA

why buy 2-3 or even 4 pair of different glasses at 30-50$ each when you can buy 1 set that protects against most wavelengths?

http://store.oemlasersystems.com/ind...products_id=44

yes i own a pair of these and i wouldnt sell or trade them for anything...not to mention i dont have to buy any more safety glasses for a while...
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Old 03-22-2009, 08:26 AM #11
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Default Re: ALL Wavelegnth glasses .. . an exercise in WHA

Those ML7s don't cover higher powered (&gt;150mW) lasers in red wavelengths, but they're great for virtually everything else.
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Old 03-22-2009, 09:10 AM #12
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Default Re: ALL Wavelegnth glasses .. . an exercise in WHA

I love the lead! You really can't beat it for protection. ( There is no machining necessary... it comes in an easy to use foil * http://www.nuclead.com/leadsheet.html )... its just that the LVT ain't so good. :'(
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Old 03-22-2009, 01:31 PM #13
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Default Re: ALL Wavelegnth glasses .. . an exercise in WHA

Quote:
Originally Posted by Dark_Horse
I ran a group-buy last summer for some of the &quot;ML-7's&quot; from OEM Laser Systems.
http://www.laserpointerforums.com/fo...m=1217790369/0
They are perfect for the laser-hobbiest. They protect against all of the &quot;common visible-wavelengths&quot; of laser-systems that we would be using here, plus IR and UV. You can view the spec's here:
http://store.oemlasersystems.com/ind...products_id=44

I highly recommend these goggles. While there was some question by a GB-participant last year as to whether the OD-1.8@ 650nM would be enough for high-power reds, it certainly is perfect for me, I will let someone else calculate the power of a 300mW-red hitting the lens directly, but it should be under 10mW. If I understand correctly, they are also &quot;certified&quot; for 405nM now, same lenses, they were just working of the certification last summer, so maybe they will change the name to ML-8s now .

While they cost most more than most, they have great VLT for multi-wave lenses and are cheaper than buying seperate goggles. Not to mention, they are a must if you are dealing with multiple wavelengths at once, such as DPSS or gas-lasers.
Hope it helps
i was in his group buy and i love these goggles i can still see reasonably well. If you want a picture through the goggles i can get it.
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Old 03-22-2009, 02:16 PM #14
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Default Re: ALL Wavelegnth glasses .. . an exercise in WHA

this is from the chimp
Quote:
Your calculation should be 300/101.5=9.47 or 300/10^1.5 = 9.47. The 1.5 is an exponent.
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