Okay, story time. I was asked for the tale of my laser eye injury, so here you go. I'm fine. Customers were fine. No children were harmed. The only victims were me and Bob's career. https://www.funraniumlabs.com/2024/07/how-i-got-my-laser-eye-injury/
How I Got My Laser Eye Injury - Funranium Labs

It has been brought to my attention that I have never actually written this story down before, merely told it in person to many students for valuable lessons and also for laughs over cocktails. It is a litany of bad ideas from several people that all came together at once to reach out and zap … Continue reading "How I Got My Laser Eye Injury"

Funranium Labs

@funranium (reads)

It just keeps getting worse, doesn't it.

@azonenberg @funranium oh god. This would still be an amazing story if you'd stopped the tale at nearly *any* point, even at "You see, we had an idea…"

@funranium "On closer inspection, we later leaned that the Quanta-Ray had burnt through the wheel well and cut the brake line"

uh. Well then. A. glad you found that B. glad you weren't in a spot where it could do that to your retina?

@funranium how did it keep getting worst from there o.o
@funranium I literally gasped at points
@sortius @funranium literally read every bit like “this can’t get worse right” and was disproven

@funranium That's a pretty good laser-eye-injury story, from both a humour and an educational perspective.

I kind of love how it's also the classic "wasn't wearing laser goggles and bodged something, with serious consequences".

@funranium Nice. The bit about the goggles reminds me of the physics lab I worked in one summer long long ago ... their optical train started with an IR source and went through several frequency doubling steps to get into UV. So, the joke was that the only way we could get eyewear to protect against all those steps was to spray paint it black. Fortunately I never had to go in that lab when it was on, my project involved a 5W argon-ion laser in a different room.
@acsawdey So, as the person who specifies eyewear, I can definitively tell you they fed a line of bullshit.
@funranium Good to know. Was pretty sure of that at the time, it was in aid of a low budget. I was a kid just out of high school so 🤷‍♂️
@funranium ooh, how does eyewear that protects against that work? A bunch of stacked filters, or something cleverer?
@mimir @funranium I'm imagining a comb filter as a solution but I don't recall if those are suitably shaped and cheap enough for use on goggles. but then I've only ever looked at that stuff in the context of the Kerr effect and interferometry. would certainly be interested in knowing how it's actually handled.
@gsuberland i guess you could do a "default-deny" approach and just put a narrow bandpass filter on...who needs to see color, anyhow

@mimir @gsuberland There's a reason many-line laser goggles have really low visible light transmission (I've seen figures of 15% or less).

Thankfully the only optical protection I need in my lab is for high intensity 365nm UV (not coherent, but like a watt of collimated optical power focused to a small spot).

And I found a pair of NoIR goggles that are IIRC OD 6.0 at 365nm but transmit most of the visible wavelengths starting around mid-green, something like 70% transmission across the visible band.

OTOH we have a (currently inactive and unplugged) laser at work that's 1064 / 532 / 354 (YAG with nonlinear doubler/tripler crystals). If we ever decide to set it back up again I can't imagine the required tri-line goggles will let much visible through...

@gsuberland @mimir Wavelength absorptive dyes in acrylic, generally.

@funranium @hendric

Oof. That’s a wild story. Can’t say I’ve ever seen anything remotely as bizarre and ill-advised, but I did once witness what happened (with many fewer bad consequences) when you don’t pay attention to laser safety.

When I was an undergrad I did a research project in a laser lab whose primary laser was a 5W-ish nitrogen laser. The students and PI working there pointed out the safety interlocks, the heavy blackout curtains, and various other bits of gear and protocol to keep things safe.

They also pointed out The Hole. This was the roughly 5mm diameter, perfectly circular, hole burned through the blackout curtain one day when the beam went someplace it wasn’t supposed to.

Looking through The Hole from inside the laser room, you could see the frosh chemistry lab.

It did not need any saying to make it clear that it would not go well for you if you made a Second Hole.

@funranium Oh crap, now I know why you come down so hard on the “do not look into laser with remaining eye” joke — well, that and general empathy, I guess.

@funranium the further through this I read, the longer my "oh no"s got.

oh nooooooooooo.

@gsuberland @funranium I hope the VP didn’t need their car that day…

@funranium I just kept repeating “Jesus. Jesus. Jesus.” all the way through the story.

Jesus.

@funranium what a wild ride, never knew what the next paragraph would bring. Amazing.
My first thought about the wrong laser safety goggles

@funranium @mxshift ~~do not look into laser with remaining eye~~

Edit: Apologies, it's been pointed out to me that this is in rather poor taste given what happened. Will delete if requested but leaving up for now to acknowledge.

furranium (@[email protected])

Content warning: Danger sign

RedWombat.social
@itgrrl Fair point :/ Updated with an apology and acknowledgement, will delete if requested.
@funranium Aiyaiyai, that's one hell of a tale, well told. Hope the damage is done and is not progressive.
@funranium Wow. My expletives became worse and louder as the tale went on.

@funranium

Probably the biggest one Xerox had for laser printing.Visible light red, and a high voltage power supply about the size of case for ten five and a quarter inch floppy disks. I was showing people how tight the beam was in a college dorm corridor, but I am not a fool and don't want to risk anyone's vision. So I put the whole thing on the floor and and turn it on with the beam maybe two inches off the carpet. Of course someone tries to crouch down to look in it.

@funranium this story, holy shit. well told. glad it wasn't worse.
@funranium The safety goggles! Like people donning face masks as "protection" against hazardous fumes (as opposed to particles and aerosols) ... or moistened handkerchiefs as in movies. Even *gas* masks will not protect you unless the proper filter is attached and if there's no oxygen you're a goner either way.
@funranium Um, wow. What the hell Bob?
@funranium Wonderfully written.
Though I would amend the morale: if you do hurt the safety person, then finish the job 😆
@funranium that is amazing on so many levels.
@funranium Oops... the mind wandering back to working at the Metsähovi satellite laser observatory, and yes, you *don't* want there to be an aeroplane overhead when you're firing. Even if it's only less than a joule in a tight little package of a few nanoseconds...

@funranium

given the context already of "laser stuff" you had me at hearing rapid clicking *outside*

I only ever encountered these things in darkened basements

@funranium I wish I could say I haven't experienced fuck-ups like that, but I have. They just happened to not include high-powered lasers.
@funranium Would such an experiment (with the necessary safety measures, for example inside the lab) have been part of Bobs job or did he act outside of his responsibility?
@Habrok42 Absolutely part of his duties as a sales engineer, trying to help integrate gear for a customer application.
@funranium
Don't mind me, I'm just selling fiberglass blankets to the people in the comments section.
@MisterHW Fairly worthless against this laser.

@funranium of course. But beyond that there's only aluminized silica blankets and sheet metal. All of them ought to work against diffuse reflections.

https://www.uvex-laservision.de/en/large-area-laser-protection/laser-safety-curtains/shelter-ng/

SHELTER-NG

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@funranium wow … ok that is a episode ….wow just wow

@funranium

Very uncomfortable reading. And quotable. Above all: "Are you declaring war on the United States, Bob?"

@funranium

Yikes! Glad the damage to your eye wasn't too bad. I salute your storytelling skills!