FS: CNI GLP 593.5nm (594) pointer, rated for 3-5mW.

[Paddy]

No it's cool -

Because of the beam specs (DPSS, tight thin beam), it's hard to really compare it to anything common apart from 532.

There has been so much debate about "relative brightness" recently, that I'll avoid jumping into anything too definitive. But in a very basic sense, 532 is ~24 nm from our eye's peak sensitivity, and 594 is ~ 38nm from it (on the other side).

So in a very rough, basic sense, I'd say 594 is probably "a bit less bright per mW than 532".

I think a better way to convey the brightness is just to describe this pointer subjectively.
- In a brightly lit room, you won't see the beam (at any angle)
- In a dimly lit room, you'll be able to see it when on axiz
- In a dark room, you'll be able to see it when view from the side, if you're paying attention and looking for it, but it won't look like a "blade slicing through the air"

- And finally, if there is any particulate matter in the air (dust, hair spray, steam, fog, cooking oils, etc) then you'll enhance all of the above.

How about the night sky, with not much street light illumination?
(it's times like these i wish i had an LPM, i have a 1mw rated 532nm but it seems like more to me. hard to get a feel for how bright it'd be)
With the 1mw rated i have i can see the beam easy, but not blindingly if you get me. Would this be the same? or needs that bit of fog/dust to show.
Edit: Is there any warranty left on it?

 

[rhd]

How about the night sky, with not much street light illumination?
(it's times like these i wish i had an LPM, i have a 1mw rated 532nm but it seems like more to me. hard to get a feel for how bright it'd be)
With the 1mw rated i have i can see the beam easy, but not blindingly if you get me. Would this be the same? or needs that bit of fog/dust to show.
Edit: Is there any warranty left on it?

Nope, no warranty left on it.

Night sky - good question. Can you give me approximate 4 hours? (depending on mother nature). I should be able to tell you then

 

[Paddy]

That's sounds cool
It's strange it's like pitch black in the UK around 5pm right now, perfect laser month cus of the foggy weather too!

 

[scopeguy20]

I have one that is about 2 mW and I can see the beam easily in a dark sky. It is very comparable to the same mW green to my eye. -GH

 

[rhd]

That's sounds cool
It's strange it's like pitch black in the UK around 5pm right now, perfect laser month cus of the foggy weather too!

Alright, two nights of testing here for you

On both nights, I could see the beam.

Last night the beam looked like a "line of sparkles", if that makes sense. Basically, the particulate matter in the air would light up, and create hundreds of "sparkles" that combined to create the look of a beam.

Tonight the beam looked more solid. It also faded to invisible and then reappeared, which tells me that it was more visible in certain elevations (layers of the atmosphere).

In both cases, the beam wasn't a blinding yellow razor cutting through the sky, or anything like that. It was visible to be sure, but I don't think someone standing off-axis would have seen it.

I'm with glen. This looks basically like the brightness of a ~2 to ~5 mW green to me.

 

[rhd]

If anyone is interested in this, let me know. This is the rare occasion where I think I can actually list this pointer on eBay legitimately, so I'll do that in the next couple days if nobody from LPF is interested in grabbing it.

 

[Sigurthr]

Interested or interested and posessing the funds to approach you with an offer? Haha, I kid. Good luck with your sale man!

 

[Deleted member 22482]

If anyone is interested in this, let me know. This is the rare occasion where I think I can actually list this pointer on eBay legitimately, so I'll do that in the next couple days if nobody from LPF is interested in grabbing it.

How about making an auction.. :san: I'd be one of the bidders for sure.

 

[rhd]

How about making an auction.. :san: I'd be one of the bidders for sure.

I might do that - though to be honest, I'll probably have the starting bid at at least $200.

I've only seen 589s up on eBay, and they're never priced well. They don't explicitly state their source, but they've clearly been 589 GLPs in the 0.5 to 3mW range, and they've been at $350+ new.

I'll probably pop this up on eBay with a 10 day auction starting at $200 + 8% (so $216), with a BIN of like $290 or something like that. Basically, so that I at least get $200 for it after fees (which is what I wouldn't sell for less than).

 

[lazeristasUVISIR]

Haha, well, it IS putting out 25mW!

But I'd bet my life on the fact that most of that is IR.

You probably have in your possession several safety goggles. Just put them between the laser and a power meter, and you'll get more numbers to estimate power.

 

[plexus]

I suggest investing in a good IR filter (either IR pass or block). Shining through goggles and measuring is not a good way to get an accurate sense of IR content. think about it.

there is a seller on ebay that sells good lab quality optical filters at decent prices. you may have to spend $20-40 for one but then you can actually measure IR content. sorry I don't have the ebay seller's name but search for optical filter and look for a seller that has a ton of them.

 

[rhd]

You probably have in your possession several safety goggles. Just put them between the laser and a power meter, and you'll get more numbers to estimate power.

Tried that. I actually have IR glasses. The challenge is that they obviously (visibly) block about 80% of the 594 as well. They're not very narrow in their blocking range apparently.

I suggest investing in a good IR filter (either IR pass or block). Shining through goggles and measuring is not a good way to get an accurate sense of IR content. think about it.

there is a seller on ebay that sells good lab quality optical filters at decent prices. you may have to spend $20-40 for one but then you can actually measure IR content. sorry I don't have the ebay seller's name but search for optical filter and look for a seller that has a ton of them.

Ya... I could do that - but for a $200 sale, I'm not going to. This is a $200 DPSS yellow.

 

[lazeristasUVISIR]

Tried that. I actually have IR glasses. The challenge is that they obviously (visibly) block about 80% of the 594 as well. They're not very narrow in their blocking range apparently

As goggles are a two-plastics system you may pass a beam one time to cut IR, then use several mirrors to pass the second time to figure out yellow absorption :san:

What is a minimal measurable power of your meter? :can:

 

[rhd]

As goggles are a two-plastics system you may pass a beam one time to cut IR, then use several mirrors to pass the second time to figure out yellow absorption :san:

I don't follow you. If I shine the beam through the goggles once, I get no IR, and what appears to be about 1/5th of the yellow. All the rest is absorbed by the plastic goggles (and probably a bit is bounced off back in the direction of the source beam).

How do I use mirrors?

 

[lazeristasUVISIR]

I don't follow you. If I shine the beam through the goggles once, I get no IR, and what appears to be about 1/5th of the yellow. All the rest is absorbed by the plastic goggles (and probably a bit is bounced off back in the direction of the source beam).

How do I use mirrors?

As you don't know actual absorption of your filter at 594nm, you need to pass a beam (now only 594 if the goggles really absorb 100%@ 808, 1064, and 1342) one more time and measure power again to get an idea how much power you lost in the goggles.

All this hassle if you really want to know the power and you have nothing else to do :na:

 

[plexus]

Aren't we talking about a 5-10mw laser? your meter is not going to get an accurate reading of IR unless you have a meter designed specifically for low powers. i have yet to see a hobbiest LPM that is accurate at low power levels (eg. < 20-50mw). added to that the google technique which is going to make it even less possible. you also have to know the absorption characteristics of the filter in order to accurately determine IR. you need a lab quality filter with a wavelength plot of its transmission characteristics.