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Old 09-29-2015, 01:57 AM #2129
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Default Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

Anyone ever used one of these?
975nm 8W Fiber Coupled Laser Semiconductor Fiber Coupled Laser 8000mW IR Laser | eBay

Should have decent beam specs with the fiber coupling, right?


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Old 09-29-2015, 02:47 AM #2130
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Default Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

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Originally Posted by Atomicrox View Post
Should have decent beam specs with the fiber coupling, right?
Nope. Fiber core diameter is 105Ám. ~1W blues are 15Ám emitter, and single mode reds are 2Ám emitter if I recall.
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Old 09-29-2015, 11:15 AM #2131
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Default Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

OK, thanks.
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Old 09-30-2015, 08:33 AM #2132
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Default Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

That dam double beam 2.5W mitsu 638nm is on sale at olike.

Mitsubishi 638nm 2.5W red laser diode/double laser beam [OL-M-2.5W] - $129.00 : Zen Cart!, The Art of E-commerce

These I think have been going for 200 or more, and I know there is a triple out also.
Anyway is 129.00 a good deal?
I don't like these, I hope they go away and put in bigger single emitter 638's
I would hate it is others went this way, but if they do then we will find a way.
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Old 09-30-2015, 03:05 PM #2133
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That dam double beam 2.5W mitsu 638nm is on sale at olike.

Mitsubishi 638nm 2.5W red laser diode/double laser beam [OL-M-2.5W] - $129.00 : Zen Cart!, The Art of E-commerce

These I think have been going for 200 or more, and I know there is a triple out also.
Anyway is 129.00 a good deal?
I don't like these, I hope they go away and put in bigger single emitter 638's
I would hate it is others went this way, but if they do then we will find a way.
Theres still like 10-15$ shipping... it ended up like 145$ with tax and stuff if i remember correctly, i have one thatvi may not ever end up using :/ i still cant find a driver
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Old 10-02-2015, 09:32 PM #2134
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Default Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

Three of these in a host might be cool, i have just the host too
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Old 10-02-2015, 09:37 PM #2135
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Default Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

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Three of these in a host might be cool, i have just the host too
If you can get the 3 beams to run parallel that would be very cool indeed, but 3 sets of 3 all spreading out...I would be afraid to point it as beams would be going everywhere like a scatter gun.
I think I saw a pic where someone had the beams all running parallel, but I don't remember what they said they used.

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Old 10-02-2015, 10:04 PM #2136
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Default Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

He put it through a 5x beam expander, was podo. Somehow that made them more parallel.
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Old 10-02-2015, 11:19 PM #2137
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Default Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

I have some G7 lenses on the way from podo, tracking shows they have been stuck in New York for a week, the postal service has been slow lately.

They look like fun with a G2 style single element and a longer focal length like the 3element. G2 is 2.39mm FL where as 3element is 5.3mm FL the G7 is supposed to be arounf 6mmFL.

Yes I know we clip the ends of the highly divergent axis because of the limitation of our 12mm hosing with it's 9mm inner diameter, but that is the weaker part of the beam anyway. Wider modules with wider optics would be nice but the next generation may well be multi emitters in each diode.
A lot may change, but that could be a good thing, only time will tell.

podo has some good prices listed.

https://sites.google.com/site/hkfew5e22/accessories

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Old 10-03-2015, 12:58 AM #2138
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Default Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

@alaskan: look at a diagram for a beam expander. Usually after the furst lens, they are illustrated as two lines spreading out in a V (like the mits diode is by default), hitting the second lens, and becoming parallel. If you think about the shape of the optics, it makes sense.

So here's a question; could you collimate the diode with an aspheric, then use a relatively small PCX lens to make the two beams parallel and fairly close together?
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Old 10-03-2015, 02:02 AM #2139
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Default Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

Quote =Alaskan: He put it through a 5x beam expander, was podo. Somehow that made them more parallel. End Quote

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Originally Posted by crazyspaz View Post
@alaskan: look at a diagram for a beam expander. Usually after the furst lens, they are illustrated as two lines spreading out in a V (like the mits diode is by default), hitting the second lens, and becoming parallel. If you think about the shape of the optics, it makes sense.

So here's a question; could you collimate the diode with an aspheric, then use a relatively small PCX lens to make the two beams parallel and fairly close together?
Yea I know because A basic expander is a double concave then a doublet or bi convex and I don't see how that would straighten 2 beams headed away in a V shape without changing the beams focus as well.

I think you could use an aspheric then a very shallow cylindrical convex but a shallow PCX would change the focus of the beams as well wouldn't it?

One question is what is really coming out of the aspheric as there are 2 off center sources, what do the 2 beams really look like?

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Old 10-03-2015, 05:39 AM #2140
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Default Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

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Quote =Alaskan: He put it through a 5x beam expander, was podo. Somehow that made them more parallel. End Quote



Yea I know because A basic expander is a double concave then a doublet or bi convex and I don't see how that would straighten 2 beams headed away in a V shape without changing the beams focus as well.

I think you could use an aspheric then a very shallow cylindrical convex but a shallow PCX would change the focus of the beams as well wouldn't it?

One question is what is really coming out of the aspheric as there are 2 off center sources, what do the 2 beams really look like?
THIS IS MADNESS - Mitsubishi 639nm 3W "Twin buster" Updated Output test
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Old 10-04-2015, 02:15 AM #2141
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Default Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

Hi guys,
I was looking to buy one of those cheap usb laser engravers. BTW gearbest just started carrying them. Anyway, I just came across this on ebay. If this is as good as it says it is, could I start a small laser engraving business with this? I used to do a lot of engraving using a manual machine about 20 years ago. Actually had a computer doing engraving back in the 80's as well. It had all its fonts on Atari 2600 type cartridges.
40W CO2 USB Laser Engraving Cutting Engraver Carving Machine With Water Pump | eBay

Sorry about being long winded but this sounds too good to be true!
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Old 10-04-2015, 04:37 AM #2142
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Default Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

Blair, hey buddy. I looked it over and if it still works it should do what you are trying to do. Seems like a reasonable price, too.
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Old 10-06-2015, 08:12 AM #2143
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Default Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

Great price on 3400 Panasonic 18650's. Wish I saw this a week ago i just payed twice that. 3 for 36$
2 Genuine Panasonic NCR18650PF 18650 2900mAh 3 7V IMR Flat Top Li ion Battery | eBay
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Old 10-06-2015, 07:34 PM #2144
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Default Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

Quote:
Originally Posted by olympus mons View Post
Great price on 3400 Panasonic 18650's. Wish I saw this a week ago i just payed twice that. 3 for 36$
2 Genuine Panasonic NCR18650PF 18650 2900mAh 3 7V IMR Flat Top Li ion Battery | eBay
Those are 2900, not 3400.

Regardless, that's not a good price. 3400mah Panasonics are about $5.50 each. Not sure where you paid $36 for 3x (or why), but that was a rotten deal.
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