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Old 03-24-2016, 08:14 PM #1
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Post Hello from a long time listener, first time caller.

Hello Everyone. I've been lurking on and off for quite a while, here as well as many other forums. Been on the net since before the web was a thing, but this is like maybe the ~10th time I've ever posted anything on the net, & I rarely ever join any communities or forums (or groups). In another thread I was reading today I finally saw several posts that finally got me to break down and sign up with LPF. Maybe some other day I'll chime in with my opinions on the posts I read. I'm sure I'll get a chance again sooner or later, but I digress.

I should probably start by saying thank you to everyone for the interesting and informative forum. I appreciate the effort you guys put into all the replies and I'm sure a ton of admin stuff. Like I said I've been lurking for a long while, and I've learned a lot, maybe even saved an eyeball or two.

I'm sitting tight right now until I manage to get my hands on the right safety glasses. They always seem pricey every time I've checked them out.
(I am actually aware, considering what they do, how inexpensive they really are.)

I checked out a link someone posted to survival laser's glasses, I'm starting to understand things I think. It seems the Eagle Pair 190-540nm & 800-2000nm in OD4 (an attenuation of 10,000) says its good for looking at a non reflective spot from a 10w or less laser in the indicated wavelengths.

Does this mean if you got flashed (with a red 650nm laser say), like the guy who accidentally dropped a blue laser he was working on, and burned his retina, they would not protect from that sort of accidental exposure?

They seemed like the best deal for only 1 pair that would cover anything I'm interested in currently. I'm going to check a couple places locally, before I do anything, I'm hoping I might be able to get a deal.

Also was reading that pretty much anything transparent blocks IR, does that mean standard wrap around Lexan safety glasses would block say 780nm? or is it much higher IR wavelengths (say up around 1000nm) that are blocked by everything?


Just like another newbie mentioned, I've got tons of CD and DVD burners, & I'm keeping my eyes open for a steal on a blue ray burner. I'm interested in using unfocused or only slightly focused IR diodes as illumination for CCD cameras. I'm guessing they are ~50-200mw. It seemed like the red 650nm ones with no lens produced ~ 1meter spot @ 1-2meters distance.


I'm interested in eventually building my own power meter, I've read Sam's FAQ, where he mentions DIY power meters with simple K type TCs and black objects. I've got a few people that might be able to help me with calibration. I've got a few bolometer / thermopile type things, but they are prolly too sensitive and not made for measuring high intensity flux.


Can a neutral density filter be used to affect the intensity of a laser beam, like it affects regular light. I have a set of ND filters that came from a laser lab actually. So could I use them to extend the range of a power meter or measuring methodology? Sam's technique was either carbon on a plate or graphite pieces I think, which should cover my needs for a while.


For various reasons, I'm only now able to start working on many of the projects I've been waiting for and wanting to do. I've been collecting stuff for a long time now, and have quite a collection of "junk" or "stock", depending on your view.


A few other things I'm interested in building are, an Air-gap flash, (sort of the Edgerton variety) for high speed photography. I'm pretty sure I have all the parts, just need to put it all together.

A laser cutter seems like it would be fun to build and useful as well, solid state or CO2 based.

Building a TEA Laser seems like a no brainer just to do it, A CO2 laser(DIY tube) is also within the realm of possibility (think the tubes have gotten dirt cheap, almost not much point in a DIY tube).

Not sure if I'll ever build one but I have always been fascinated by the CuCl Amateur Scientist laser from Scientific American. Pretty Sure I have everything (but Brewster windows) on hand to put one together.

I'm rebuilding / repairing a MIG welder, and modding another one for better performance too right now. I've got tons of other little projects, to many to name, lined up, like battery pack rebuilds, equipment rebuilds, and upgrades.


It's weird how many times over the years I've ended up here, after searching for something not necessarily directly laser pointer related. So again thanks for the effort you guys put into this forum.


One last Question: When is a thread dead? I ran across posts referred to as being semi-necro, the thread was old, but apparently not quite dead. So when does etiquette dictate a thread is old. I used the search (actually answered several of my questions, but earlier wasn't able to get a good answer) to find point #3 in the etiquette guide, but it doesn't really say how old is old. Just curious, why is it that considered a bad form?


Sorry about the long post.


Looking forward to participating in the forum


Quick






Had a 5w Spectra physics Argon head but I let someone check it out for me before I knew what was up, I suspect some critical optics evaporated. Got rid of it.

Siemens 5mw HeNe
Uniphase 5mw HeNe

Hand held 5mw HeNe with line generator for barcode reading

and various 5mw 650nm laser pointers


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Old 03-24-2016, 08:32 PM #2
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Default Re: Hello from a long time listener, first time caller.

Welcome! Lots of people here with lots of knowledge.
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Old 03-24-2016, 08:32 PM #3
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Default Re: Hello from a long time listener, first time caller.

Hello Quick, welcome to LPF.

Alan
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Keychain 650nm <5mW
Quartet 4-in-1 630-680nm <1mW

AtlasNova 635nm <5mW
MillionAccessories 532nm <5mW broken
M462 462nm one of a kind (in progress)
PLTB450B 450nm 1913mW G2 lens
PL520 520nm 82mW acrylic lens
S06J 12X 405nm 590mW G2 lens
C6 M140 445nm 1.5W 3 element lens
9mm 445nm with G2 lens in a stainless steel host
Radiant Electronics X4 3.7W Laser Power Meter


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Old 03-24-2016, 10:08 PM #4
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Default Re: Hello from a long time listener, first time caller.

Welcome to LPF officially.

To answer your question about necro-posting, it is OK to post on an older thread if you are adding important info or updating etc. the problem is when someone posts something that is useless.
I'd say that a thread becomes "old" at somewhere around a month or perhaps two in some cases.
Just use your judgement to see if a thread is current and how important an update would be and you'll be fine.
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Laser Safety Information

Noteworthy Lasers and λ's:
685nm: 24mW pointer pen
660nm: 230mW LPC-826 in WF-501b
647.1nm: Omnichrome 643 air cooled Ar/Kr ion 5-line max
638nm: 600mW Kryton Groove
635nm: 5.8mW DIY pointer pen 0.6mrad
632.8nm: 20mW HeNe SP-107 - 0.5mW P210 tiny 6" HeNe tubes - 6mW Hughes 3225H-C made in 1980.
594.1nm: 4.1mW Coherent 31-2230-000 HeNe from Sigurthr - 1.7mW HeNe REO-LHYR-0050M
568.2nm: Ar/Kr
543.5nm: 3.1mW Coherent HeNe - 1 mW MG HeNe
542nm: multi-line DPSS
537nm: multi-line DPSS
532nm: 500mw CNI PGL-III-C, 2*Pman laser builds: 20mW & 50mW (One displaying 6-lines)
515nm: 36mW laserBtB
514.5nm: 2214-40MLA Argon Ion
501.7nm: Argon line
496.5nm: Argon line
488.0nm: Argon line
476.5nm: Argon line
462nm: 2W M462 Kryton Groove
457.9nm: Argon line
450nm: 94mW laserBtB
445nm: 2.5W NDB7875 Kryton Groove - A-130 Kryton Groove - 40mW Pen laser using NDB7242E diode
405nm: 100mW PHR-805T

Building:
520nm: PL520
337.1nm: TEA laser

"Fiat Lux" - preferably laser light.

Last edited by Mattronium; 03-24-2016 at 10:10 PM.
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Old 03-24-2016, 10:32 PM #5
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Default Re: Hello from a long time listener, first time caller.

Welcome!

-Alex
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Old 03-25-2016, 02:14 AM #6
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Default Re: Hello from a long time listener, first time caller.

man you wrote a full book welcome
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Old 03-25-2016, 03:38 AM #7
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Default Re: Hello from a long time listener, first time caller.

Welcome to lpf
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Old 03-25-2016, 04:12 PM #8
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Default Re: Hello from a long time listener, first time caller.

i am sorry i cant answer all of your questions. I would like to welcome you to the forum.
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Laser Safety
Eye Safety First:Uvex S1933X Skyper Safety Eyewear, Black Frame, SCT-Orange UV Extreme Anti-Fog Lens
"5mw"* 405nm Gearbest Pointer - Highly Unlikely to be 5mw
5mw 445nm Custom Pointer in a former Cordless Drill "Gun Style" Host - proof of concept before going into Nerf Gun
5mw ~515nm Bladed LightSaber Osram pl515 with "Growing Blade" Video attached (Host by Ehgemus)
5mw 532nm Pointer Broken? After months of no use it works now... can't explain.
5mw 685nm from 10fenny in Pen Host - Link - Broke Driver taking it apart
Graveyard
0mw 450nm Osram PL-450 RIP 11/25/2015
Two Laserlands 5mw 445nm Pens

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Old 03-25-2016, 09:56 PM #9
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welcome to the forum!!
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Old 03-25-2016, 10:04 PM #10
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Default Re: Hello from a long time listener, first time caller.

Quote:
Originally Posted by quickquestion View Post
Also was reading that pretty much anything transparent blocks IR, does that mean standard wrap around Lexan safety glasses would block say 780nm? or is it much higher IR wavelengths (say up around 1000nm) that are blocked by everything?

If you mean Normal clear plastic goggles , No , they will NOT block NIR wavelengths in the 700 - 1000nm range ( including 1064nm )

You would need goggles rated for it , There are broadband IR goggles for 700 - 1064nm

Clear plastic goggles work perfectly for a Co2 laser at 9600nm / 10600nm though
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Last edited by DashApple; 03-25-2016 at 10:07 PM.
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