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FrozenGate by Avery

PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please sub

Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

Here's something interesting (Alaskan, were you looking for big red diode lasers??)

SDL Special SDL-7400-P6 High Power Fiber Coupled Linear Array Laser Diodes | eBay

The seller has a few listings of lasers similar to this. Looks like fiber coupled 4W of 665nm (although product number does not match what is in the spec sheet in the picture). Would probably give a much better beam than those C-mount 5W diodes we had a few years back. Looks like these diode arrays were special made for a customer, and could be a more interesting wavelength.

When I google the part number, I actually get a link to this forum: https://www.google.com/url?sa=t&rct...h0074851.pdf&usg=AOvVaw0FS1cf3RAvskqe0oIc7w2V

If I had more money, I'd buy one for funsies.
 





Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

Tks Styro, made a low offer I don't expect to be accepted. My concern is whether this was a bad part pull, or good. The wavelength is long, if it were 630 nm I'd be willing to risk a better offer he might accept.
 
Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

WizardG said:
The price is very reasonable for that much 532 goodness. What sort of mirrors would a scanner need to handle that much power?
Click to expand...


Big ones. Can't remember off the top of my head but >10mm aperture would be fairly typical, probably 15mm or even 20mm. >1mm thick.

Bottom right on this image has a set: https://www.flickr.com/photos/prodjallen/4385355956/

Couldn't find a better picture without more digging.

Heads up, someone on PL is selling a scope far cheaper than that. Although, it's the 800 series which'll do ~40W of 532nm Q-switched. See >>THIS<< post.
 
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Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

May require lots of work to repair and make functional. These are complex medical lasers, not something you can just plug in and turn on. Just a heads up for anyone thinking of buying one. These things are a whole nother beast.
 
Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

The first one I posted being sold by weartronics-usa in Hayward, California is tested working: https://www.ebay.com/itm/122638137014 - I asked how he knew it was producing full power, this was his response:



Edit: interesting thread on a surplus unit someone bought, there is a serialised fibre optic connection on the output which won't allow the unit to work unless it sees a fiber with the right numbers on it, the computer inside keeps track of the amount of usage the fiber gets and won't allow output if it runs out of time/or usage.

More here: http://isopack.blogspot.com/2014/10/greenlight-hps-part-1-getting-to-know.html

This is a project I would take on with an understanding there might be difficulties, someone new to this stuff, forget it being easy, might take a long time to learn enough to be able to do something with it.
 
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Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

Alaskan said:
The first one I posted being sold by weartronics-usa in Hayward, California is tested working: https://www.ebay.com/itm/122638137014 - I asked how he knew it was producing full power, this was his response:



Edit: interesting thread on a surplus unit someone bought, there is a serialised fibre optic connection on the output which won't allow the unit to work unless it sees a fiber with the right numbers on it, the computer inside keeps track of the amount of usage the fiber gets and won't allow output if it runs out of time/or usage.

More here: I <3 Clare: Greenlight HPS Part 1: Getting to Know You

This is a project I would take on with an understanding there might be difficulties, someone new to this stuff, forget it being easy, might take a long time to learn enough to be able to do something with it.
Click to expand...

Chiming in as the author of that blog post - yes we have gotten those to turn on and output a crapton of 532nm. They are incredibly efficient; we've metered over 120W out with only a couple kilowatts into the system and probably 600W out of the pump diodes. They also have all the drawbacks of the lamp-pumped Laserscopes - poor beam quality, incredibly dangerous, and pulsed output only.
The cavities are pretty exotic - a stack of seven microchannel-cooled bars is sent through a set of beam-shaping optics. The pump is off-center (830nm) and end-pumps a YAG rod with graduated dopant concentration - the combination of graded doping and off-center wavelength causes the pump to be absorbed along the entire length of the ~100mm rod, thereby distributing the thermal load. I believe it also features two LBO's and Q-switches operating at orthogonal polarizations to improve green conversion efficiency.
I will also point out that passing the self-test in no way indicates a functioning laser. The laser will successfully self-test and boot even with no green output; the only thing it confirms is that the voltage drop of the diodes is sane. Conversely, an HPS can have half a dozen errors and still be fully functional (watch out for flow errors though, loss of water during operation for even a few seconds will severely degrade the pump diodes).
 
Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

Thank you for coming over to give more information. I'd love to buy one of these and make it a long term project, but I don't have any use, just like lasers. Unfortunately, my home is in Alaska which makes shipping high. Also, I'm in Iraq for some time to come supporting the military as a civilian, not home to play :(

If I were to own one, I'd try to get full power out just to see that wonderful beam for myself, then I'd start thinking if there might be a way to downsize it at perhaps 25% the power output so the thing isn't such a monster.
 
Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

bwang said:
Chiming in as the author of that blog post - yes we have gotten those to turn on and output a crapton of 532nm. They are incredibly efficient; we've metered over 120W out with only a couple kilowatts into the system and probably 600W out of the pump diodes. They also have all the drawbacks of the lamp-pumped Laserscopes - poor beam quality, incredibly dangerous, and pulsed output only.
The cavities are pretty exotic - a stack of seven microchannel-cooled bars is sent through a set of beam-shaping optics. The pump is off-center (830nm) and end-pumps a YAG rod with graduated dopant concentration - the combination of graded doping and off-center wavelength causes the pump to be absorbed along the entire length of the ~100mm rod, thereby distributing the thermal load. I believe it also features two LBO's and Q-switches operating at orthogonal polarizations to improve green conversion efficiency.
I will also point out that passing the self-test in no way indicates a functioning laser. The laser will successfully self-test and boot even with no green output; the only thing it confirms is that the voltage drop of the diodes is sane. Conversely, an HPS can have half a dozen errors and still be fully functional (watch out for flow errors though, loss of water during operation for even a few seconds will severely degrade the pump diodes).
Click to expand...

These can't do CW like the older 800 series? The 800 series will do ~10W (Or a little more) CW and ~40W Q-switched.

Alaskan said:
Thank you for coming over to give more information. I'd love to buy one of these and make it a long term project, but I don't have any use, just like lasers. Unfortunately, my home is in Alaska which makes shipping high. Also, I'm in Iraq for some time to come supporting the military as a civilian, not home to play :(

If I were to own one, I'd try to get full power out just to see that wonderful beam for myself, then I'd start thinking if there might be a way to downsize it at perhaps 25% the power output so the thing isn't such a monster.
Click to expand...


See above question. That said, running them CW all the time would be an awful waste.
 
Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

Alaskan, you're kinda like me - like lasers but have no real use for them (except mabye home laser shows). Be careful if you get one of those - that amount of green and IR is not forgiving, especially with the q switch going. The peak power is insane. :eg:

bwang, just read your blog about getting the greenlight hps up and going - fascinating stuff. Sounds like they have certainly beefed up the interlock system since the older ones were so easy to defeat. And it sounds like they've taken a page out of apples book with the fibre - you can only use the fibre supplied by them, and once its had its use, the laser won't run unless you buy another. Very cheeky. Apple did a similar thing with their lightning cables - unless its genuine, the attached i'device wont charge or sync. Theres a chip in one end of the cable that identifies it to the i'device, much like the fibre on this laser. Its their way of making you buy their cables/fibres - try to go aftermarket and it prevents the thing from working. Very anticompetitive. Luckily with the cables, the chinese have reverse engineered them, or pay a bit more (but not as much as apples crap offering) and get a nice MFI cable, instead of apples that falls apart in 6 months :P
 
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Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

vk2fro: Alaskan, you're kinda like me - like lasers but have no real use for them (except mabye home laser shows). Be careful if you get one of those - that amount of green and IR is not forgiving, especially with the q switch going. The peak power is insane.
Click to expand...

OD 14 laser goggles good enough? :) Agreed.

There are a large number of broken/for parts laser rangefinders listed on ebay: https://www.ebay.com/itm/Laser-Rang...S-Class-1-Laser-Power-75W-905nm-/162719994146 - If you buy a few, as I did, the price can be much better, make an offer. Maybe he will take $10 ea for a couple or more, I don't know his price for that number of them..




What's inside:




Below, the 75 watt pulsed 905 nm laser diode and driver board found in one of these:



Probably a pulse width of tens to 100 nano seconds with a class 1 average power output of .5 mw or less.

The diode might be this one: SPL PL90_3: https://www.ebay.com/p/3pcs-SPL-Pl90-3-Nanostack-Pulsed-Laser-Diode-905nm-75w-Peak-OSRAM/1666270235

- pulse widths from 4 ns to 100 ns.
- rep rates up to 50 kHz

SPL PL90_3 Data sheets: *** https://www.osram-os.com/osram_os/e...diodes/standard-pulsed-laser-diodes/index.jsp *** http://www.eqphotonics.de/cms/cms/upload/datasheets/WSPLD-905-075-1.pdf ***

Application Note; Operating the Pulsed Laser Diode SPL PLxx: https://www.osram-os.com/Graphics/XPic7/00054198_0.pdf/Standard Pulsed Laser Diode.pdf



Laser Peak Power Calculator - Ophir

I bought some of these because I needed the laser diode and driver board for one of my weird projects, you can find the diodes on ebay, but cannot find the driver boards anywhere and I've looked for hours and hours over a few dispersed days, emailed a few leads I found online begging for boards but no answers, this listing is just what I needed :)

Why do these rangefinders use 905 nm when there is less atmospheric loss at 850 nm? A compromise between cheap peak power and atmospheric transmittance. Currently, the highest power pulse laser diodes cheaply available for the consumer market manufactured by OSRAM is their 14 watt peak power 850 nm (not sure they make the 850 nm diode anymore) and this 905 nm 75 watt pulse diode. Even though the atmospheric transmittance is lower at 905 nm compared to 850 nm, due to being far higher power, 75 watts of 905 nm will gave the same bang as if transmitting with over 50 watts of 850 nm, a net transmission through the atmosphere of nearly 4x more power compared to the 14 watt 850 nm pulse diode (in clear atmosphere with normal levels of water vapour present), thus why consumer priced rangefinders are now using 905 nm:


Black curves are for vertical, strait up through the atmosphere transmittance


This graph shows 80% at 905 nm for 1000 feet horizontal distance

​
 
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Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

Hmmm wonder what sort of range those diodes would give my laser tag guns 8-)
 
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