I got a couple of these, to maybe cure UV-set epoxy.
It came with a big lithium battery and a charger.
Two weird things:
If I shoot it at a white wall, I can see the spot with my right eye, but not with my left one. The right eye has had cataract lens replacement.
I got a mild headache from just looking at the spot on the wall for under a minute total. I also get a mild headache from using a UV flashlight.
-- John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
fredag den 13. marts 2020 kl. 00.02.22 UTC+1 skrev John Larkin:
My eye doctor, a really cool guy, blasted my right eye with his old CW argon ion laser, to spot-weld my retina to the back of my eyeball. That kinda hurt. He's Thai and his first and last names are both about
20 characters long, so everybody calls him Dr B. My retina was mostly detatched and getting worse, so he came in at 10 PM and fixed it.He also removed a secondary cataract by cutting a hole in the rear of my lens capsule with a pulsed yag.
The blue "burning" laser makes a very hot spot if you focus it carefully.
-- John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
I 'like' the description "High quality and perfect design." where have we heard 'perfect' before? And why should you trust them?
I'm very suspicious of any and all unregulated products from China. They claim it is 405nm, but unless you have a spectrum analyzer you have no idea if it is also emitting UV-B or other dangerous UV radiation. Perhaps you could lend one to Winfield - I imagine he has one of those S.A.s rattling around his shop!
Wear proper UV safety glasses (at a minimum UV-A/B rated sun glasses) when using this.
I'd treat it like light from an arc-welder, dangerous until proven otherwise.
John :-#(#
Well, toothpicks are dangerous too, if you poke one in your eye.
It seems to work. The spot, well focussed, feels very hot on my hand, so it's a lot of power. It came with a spot-matrix-pattern diffuser installed, which might be prudent to leave in place for curing epoxy. Amazing for under $10.
I wish I had a wideband spectrum analyzer, ideally something like 350 to 1700 nm. All the available OSAs go for extreme resolution over a narrow range, well under an octave. I just want to know about what the wavelength of a laser or LED is.
-- John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
John Robertson wrote in news: snipped-for-privacy@giganews.com:
Because they are such 'great businessmen'.
Finished at the top of their class...
All work is performed by stable geniuses. But all the facts about how they operate are 'classified'.
Available as in available at your shop? Otherwise, there are quite a few good (but $$$) options, e.g.
? David
If you only want an approximate number you can get that by comparing the co lor by eye. Look at the laser spot on white paper, look at a known LED on the same white paper. You should be able to get within a few 10s of nm. T he eye is very sensitive to pure colors.
-- Rick C. - Get 1,000 miles of free Supercharging - Tesla referral code - https://ts.la/richard11209
A CD or DVD disk does not help?
Some artificial lenses are transparnt to UV, your original lens is not.
Possilby your visual cortex stressed by the significantly different inputs.
-- Jasen.
There was a Car Talk puzzler many years ago that hinged on that--optical signalling to the French resistance using UV filters that made the flashes visible to old men (who had had cataracts removed) but not to young German soldiers.
UV epoxy is usually designed for Hg I-line (365-nm) peak sensitivity. I generally use a 380-nm LED, which works fine. How well does your 405 work?
CHeers
Phil Hobbs
-- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC / Hobbs ElectroOptics Optics, Electro-optics, Photonics, Analog Electronics Briarcliff Manor NY 10510 http://electrooptical.net http://hobbs-eo.com
You can do that with a CD and a ruler, with an IR viewer for the longer wavelengths. (I have a somewhat-broken lead salt vidicon camera that used to go out to 2.2 um.)
Cheers
Phil Hobbs
-- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC / Hobbs ElectroOptics Optics, Electro-optics, Photonics, Analog Electronics Briarcliff Manor NY 10510 http://electrooptical.net http://hobbs-eo.com
Unless you're colour blind..... Not so easy !
And even with normal vision, that kind of resolution is only available between 450 and 600 nm at best.
Cheers
Phil Hobbs
-- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC / Hobbs ElectroOptics Optics, Electro-optics, Photonics, Analog Electronics Briarcliff Manor NY 10510 http://electrooptical.net http://hobbs-eo.com
Bondic comes with a fairly wimpy blue LED, and it sets the stuff up hard in seconds. Clear through vias to the bottom of the board.
I haven't tried my super laser on Bondic. I'll do that today.
-- John Larkin Highland Technology, Inc The cork popped merrily, and Lord Peter rose to his feet. "Bunter", he said, "I give you a toast. The triumph of Instinct over Reason"
Or unless you are wondering if a laser is 850, 1310, or 1550 nm.
-- John Larkin Highland Technology, Inc The cork popped merrily, and Lord Peter rose to his feet. "Bunter", he said, "I give you a toast. The triumph of Instinct over Reason"
So it wouldn't be difficult to design a small wide-range, low resolution spectrometer, with some cheap gratings, an IR sensitive webcam, and a little software.
-- John Larkin Highland Technology, Inc The cork popped merrily, and Lord Peter rose to his feet. "Bunter", he said, "I give you a toast. The triumph of Instinct over Reason"
Sure does at 450nm!
-- Jeff
We are buying a bunch of custom machined extrusions from China, as small instrument boxes. We will locally blue anodize them and their custom end plates, to keep the colors uniform. Then we plan to add the artwork by blasting off the anodize with a CO2 laser.
I think the n/c laser will cost around $3K or so.
-- John Larkin Highland Technology, Inc The cork popped merrily, and Lord Peter rose to his feet. "Bunter", he said, "I give you a toast. The triumph of Instinct over Reason"
Right, provided you always start with a collimated beam. "IR-sensitive webcam" is the hard part. An Electrophysics 7290A from eBay and a USB frame grabber would be the ticket for that.
Cheers
Phil Hobbs
-- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC Optics, Electro-optics, Photonics, Analog Electronics 160 North State Road #203 Briarcliff Manor NY 10510 hobbs at electrooptical dot net http://electrooptical.net
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