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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

I won't go much higher, if someone else wants it beyond my last bid, go for it.

Edit: Price keeps being raised by this bidder, he's been bidding before the post here, so it really wasn't that :p


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

That's the bad thing about posting eBay stuff here. People start bidding on it. Sorry, Chris.
 
Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

Eh, I edited my post, he's been after it before the post here.
 
Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

paul1598419 said:
That's the bad thing about posting eBay stuff here. People start bidding on it. Sorry, Chris.
Click to expand...

The sellers often do that, to bait people into bidding more.
 
Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

I think that might be the case, he just bid it up again, what I usually do when I see that is bid it higher until no one wants it and leave them holding the bag, so far haven't been caught where I ended up with it.
 
Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

That's so wrong on many levels. I hope if this is being bid up only to entice others to spend more that it royally backfires and he is left with it plus the eBay fees.
 
Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

If people do that, they won't get caught with extra fees, they just cancel the sale after the item is "won", easy to do, but then they loose time needing to relist it.
 
Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

I wonder if there is a way to file a complaint against a seller who does this as cancelling the sale would only be proper if the item was no longer around, as being sold to someone else. Then if they relist it, one should be able to lodge a complaint.
 
Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

I've done that:

There is a "Report Item" link, but not going to do that with this guy, I don't know he is doing that:


.

Edit: I found some 30W 974 nm Fiber Lasers for a good price and had them mailed to me at the motel:

RCB, I've become a burner :p



If anyone else wants some, PM me and I will pass your email addy to this guy, no reason to go through ebay w/PPal.
 
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Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

What kind of price you we talking about for the 30 watt 974nm fiber coupled lasers, Chris?
 
Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

Depends on how many you buy, I've been asked not to disclose as part of the deal.
 
Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

PM sent, now where to get some fiber couplers and active fiber with bragg gratings.

I was thinking about getting a termination kit together, there could be a market on ebay for pumps with terminations pre installed, I'm going to need to learn more about fiber coupling as we want zero/low loss unions.


ALSO, where is the massive waste heat you see in YAG pumping ? Does active fiber not have the huge waste heat losses.....:D :D :D

th_151866.gif


1280px-Schematic_diagram_of_high_power_fiber_laser_using_a_double-clad_fiber.svg.png


The-schematic-representation-of-1-kW-high-power-fiber-laser-system.jpg


I don't know how easy it would be to hand assemble the fiber combiners, but if everything is terminated then combiners with terminations could be used, all this ahead of the active fiber of course.

6673_FiberPolarizaBmCombinSpltrs_3.jpg



---EDIT---

Is 974nm any good for active fiber pumping ?

I have seen where a seed laser is used to determine the output wavelength, there's a lot to learn here. :beer:

online_nufern1.gif
 
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Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

These have cut fibers, I need to find a termination and the tools needed to flatten them. Here's the seller on ebay, if you want to buy through that, his feedback is down a couple of points, mostly due to one buyer who nicked him several times over a multiple of buys. I do think he might be slow to ship for some buyers but he did come through and ship quickly for me. I have not tested these yet to know if they are putting out the stated power, so could run into a surprise that way.

https://www.ebay.com/itm/A-IPG-High...nm-Burn-Cut-Engrave-DIY-Cnc-Pump/112909659955

If enough members want some of these, we can probably get a better price with a group buy, but I don't know what the price would be. The seller works on machinery, but has also been working on maintaining some CNC laser systems, that's where they came from, I don't know more about them, but they are guaranteed to at least 25 watts output. Since I want to run them lower than that anyway, doesn't matter to me.

I'm not interested in huge amounts of power, so won't be combining them like that, what do you guys think about using one of these with a broken or cut fiber? My thought without further research is the irregularity, except for additional loss, will only affect the beam output profile, the same amount of power would be reflected back to the diode whether flat or irregular, correct? I mean, compared to flat without a Brewster angle like you showed which has very low loss. If I could cut the fiber to a Brewster angle, I wouldn't need to do more with the fiber except add some kind of termination hardware.

RCB, from what I see with that method of combining power, you don't have those losses, I guess that is why you are asking the question; why.
 
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Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

Yes, I am optimistic that active fiber is that efficient, I will read a lot more before spending a lot of my precious coin, but I would like to play with some 974 pumps.

I think the fiber end is an optical component, it needs to be cleaved and polished like any lens, it would be worth doing right for good beam quality and could damage your pump if energy is reflected.

I wonder what the most standard/affordable termination size is ?


---edit---

I have thought about partial dissembling the fiber coupling at the pump output and attempting to collimate the light that would be entering the fiber, of course minimizing dust/moisture would be important.


Is there a backfill of inert gas in the module ? There very well could be, and likely is, so any opening would shorten it's life I expect.
 
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Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

I wouldn't run it at all without first terminating the fiber first, Chris. There is no telling what problems this could cause, with possible failure of the unit. If you get a group buy going, let me know as I could be interested in some if the price is right.
 
Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

Will look into this further and see what he says, but I need to check these first, my LPM is in Alaska, so need another one which can measure at least 30 W @ 974 nm.
 
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