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






paul1598419

paul1598419

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

diachi said:
eb723b803c88dbaefb3d410d53fe1fc1-d2zay27.png


You never know, some old rich uncle you didn't know about could die and leave you their mansion/warehouse/fortune. Or you could win the lottery! :crackup:
Click to expand...

No uncles or aunts at all. I'm about the oldest person in my family. Everyone else has gone on to their further reward......or something like that. If I did have an uncle who looked like that.......I'd have run away from home when I was five. Whew!
 
Dutch67

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

ultimatekaiser said:
https://www.ebay.com/i/222644186590 :whistle:
Click to expand...

I've never had anything other than handhelds and 1-2 labbys. What would this require to get it running? Any special care that would be needed? If I had the money I would most definitely purchase this laser, and maybe I'll save up for a while too:)

577nm is absolutely beautiful:D
 
paul1598419

paul1598419

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

You would need the drivers which cost as much as the head and the misc. cables and power source. In all it would cost you at least three times that much. That's why there aren't many here that have them. It would be a huge investment with no gaurantee it would ever work. You would have to acquire each, piece by piece, over time in hopes you could get everything necessary to make it work. That head sits on a large heat sink with two large TECs to carry heat away and the driver is much larger than the head and has rows of circuit boards necessary to make everything work.
 
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ultimatekaiser

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

I have access to parts for these, but indeed theyre not cheap. This is cheap cheap for one of these. The head alone is $xx,xxx. 2v at 30A plus controls. I don't expect anyone to buy it. Just thought id point it out.
 
Dutch67

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

Well darn, got me a little excited for a moment:crackup:

Oh well, maybe once I win that jackpot lottery ticket:D
 
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ultimatekaiser

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

Yeah itd cost you at least a few grand to get one running. But its worth every penny. And depending on your setup, itll run them all.
 
Cyparagon

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

Why couldn't you just put 12V on the TEC and 2V 30A to the pump? Is the thermal control loop picky?
 
ultimatekaiser

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

Well the thermal control would be whatever you have to built for it-preferrably something with fast response. There are no electronics inside the head. A few little tecs and thermistors, thats about it. It is managed completely externally. You will need a pretty large heat sink with a fan on it, A couple of pretty hefty tecs for the baseplate, and thermal management for the components inside and a feedback loop for the light output, and a diode driver for the diode. And they all have to be able to interact with one another in a very particular way. I have an all analog supply for these, and it is huge, and has several thousand dollars worth of electronics in it (if bought at retail).

If you really just wanted to test the head you could just power the diode, (on a non-grounded surface) but not for more than a moment as these put off a ton of heat-and the diode bars in these are very fragile and not buyable anywhere. They are rated for 20,000 hours at spec on a very good industrial setup, but repairs outside factory are basically nil. The diode temp is shared with the baseplate (since it's mounted to the case it is also the diode +) and must be maintained at a strict 25C.

I'm actually in the middle of writing a post about how these work I just haven't yet finished it
 
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diachi

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

Did anyone get this lot?

Assorted Lasers And Optics | eBay

If so... I'd be interested in the SSY-1 and maybe the coated KTP. Don't know why whoever bought it paid $150 straight up, I'd have had a go at bidding on it seeing as bidding started at $50 and there were no bids at the time of sale...

Edit:

Anyone need some Nd:Glass?

NEODYMIUM PHOSPHATE ND HIGH POWER LASER GLASS SLAB HOYA SCHOTT LHG 8 LG750



Large optics/mounts lot. Looks like it was perhaps a dye laser at one point.

Quantel International Model PTA-1 for Parts | eBay



Another lot of optics/mounts:

++ OPTICAL & LASER PARTS ODDBALL LOT-HEAVY DUTY- ORIEL-NRC+- 25 PIECES-(#4D) | eBay




Lot of laser power supplies:

Laser electronic hardware and assemblies Lee Laser | eBay



I love the orange displays on these old Lecroy scopes.

Lecroy 9362 1.5GHZ 2 Channel 10 Gs/s Oscilloscope Includes 3 Interface Cards | eBay




Laserscope Xtal oven and part of a pump chamber.

LaserScope misc parts | eBay




Crystal Laser Q-switched DPSS - Unknown Condition.

CrystaLaser PL-2003 Q-Switched Laser Driver / Power Supply w/Laser Head | eBay
 
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Alaskan

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

If I had seen that SSY-1 I'd have snapped it up fast :(

ultimatekaiser said:
https://www.ebay.com/i/222644186590 :whistle:
Click to expand...

JENOPTIK JENLAS D2.3 SOLID-STATE DIODE-PUMPED DPSS THIN-DISC LASER Head 3W 532NM



I bought one of those three years ago, set it up on the bench with two DVM's to monitor thermistor resistances, three power supplies that had adjustable current limits on them and got several watts out of it, but keeping all of the temperatures and currents within proper range manually was one hell of a flurry of turning knobs, but it worked. It helped to have the needed temperatures for both the diode and the KTP crystal marked on the unit so I would know where to adjust the temperatures for the sweet spots, but I had to keep adjusting the knobs the entire time to keep it happy, the temperatures (thermistor resistances) kept changing fast! More doable if I had someone with me to just keep the diode temperature right while I kept the KTP on temp, but they interacted with one another so much it would still keep two people busy.

I don't think it would be too tough to interface what is needed to automatically make the adjustments. I don't know how much power it produced but it was at least as bright as my 4 watt output DPSS labby, I was probably pushing it a bit harder than 3 watts of output, or maybe because it produced a higher power density beam from being much thinner it just looked brighter but it burned my plywood backstop just as fast! It would do that with a thinner beam at less power though. I bought mine for $400 USD.
 
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diachi

diachi

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

Alaskan said:
If I had seen that SSY-1 I'd have snapped it up fast :(



JENOPTIK JENLAS D2.3 SOLID-STATE DIODE-PUMPED DPSS THIN-DISC LASER Head 3W 532NM



I bought one of those three years ago, set it up on the bench with two DVM's to monitor thermistor resistances, three power supplies that had adjustable current limits on them and got several watts out of it, but keeping all of the temperatures and currents within proper range manually was one hell of a flurry of turning knobs, but it worked. It helped to have the needed temperatures for both the diode and the KTP crystal marked on the unit so I would know where to adjust the temperatures for the sweet spots, but I had to keep adjusting the knobs the entire time to keep it happy, the temperatures (thermistor resistances) kept changing fast! More doable if I had someone with me to just keep the diode temperature right while I kept the KTP on temp, but they interacted with one another so much it would still keep two people busy.

I don't think it would be too tough to interface what is needed to automatically make the adjustments. I don't know how much power it produced but it was at least as bright as my 4 watt output DPSS labby, I was probably pushing it a bit harder than 3 watts of output, or maybe because it produced a higher power density beam from being much thinner it just looked brighter but it burned my plywood backstop just as fast! It would do that with a thinner beam at less power though. I bought mine for $400 USD.
Click to expand...

Spotted that the other day too.

It'd be easy enough to build a temperature controller to keep the temperatures where they need to be, or just buy one.

Something based on an Arduino would likely be sufficient for temperature control - +/- 0.1C or even +/- 0.01C should be possible, the latter would be more than stable enough.

Constant current is easy enough with a good op-amp and stable voltage reference. For any of our use cases it wouldn't even need to be super stable as long as there's no large spikes or other noise that might damage an LD.

Been experimenting with high power constant current drivers with decent results, even using the most basic circuits (5 components). Last test got up to 9.5A. I imagine if I were to introduce any sort of modulation I'd start seeing oscillations and such though.
 
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