260W IR Laser pump handheld?

[RedCowboy]

If you want to use the fiber you have to
#1 Cleave it ( cut it flat not angled or jagged )
#2 Terminate it ( put on a connector )
#3 Polish the fibers face ( polish the cleaved end so it's clear )

You need fine abrasive and a polishing puck to hold your connector with fiber perpendicular to your abrasive, placed on a flat surface such as a mirror or glass table.

https://www.aliexpress.us/item/3256801410525283.html?

https://www.aliexpress.us/item/3256806477958559.html?

 

[Borislav@87]

@RedCowboy
OK. thank you In general, if there is a fiber it does not work for me, because I am aiming for long range. With 260W, I have somewhat solved the problem, because the laser can be disassembled, while the 120W one cannot. I have a lens that I bought. It works with fiber. In the middle there is an opening where it passes. I will try with her and see what happens. I'm just not at my other apartment in the capital at the moment and there's no way to test it.

 

[Borislav@87]

I think I managed to set up a good output beam shape. Although without polishing and a special cutting tool. In the current situation, the fiber does not ignite. When I get home I will do tests with lenses through the fiber. If things work out, I will cut the fiber and leave about 20 cm, because it is very long. The goal, I say again, is to achieve the greatest long-range burning. Tung laser told me that the longest range is obtained through the fiber.

 

[RedCowboy]

That fiber is not active fiber, it's merely conveyance and does not improve the beam quality, but use it if you wish.

 

[Borislav@87]

When I get home, I will try the lenses with the fiber. If I get a good focus like this, I'll keep the fiber with the 120W one, because if I want to remove it anyway, I'll have to drill a hole. The bad thing is that shavings from the case can get inside and there is no way to remove them, because it does not open.
When everything is ready, I plan to use this driver for 260W. I have the same for the 120 watt 15V 15A

 

[RedCowboy]

The divergence out of the fiber can be pretty poor, people use astronomy telescopes in reverse for distance.

 

[Borislav@87]

Yeah, I've seen that video. I contacted this guy. He makes some great lasers. He also has infrared lasers. You can check out his page if you have Facebook. He removes the fiber from his lasers. He uses lenses for photography for optics.

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[Borislav@87]

@RedCowboy
With the photo lens, good focus is obtained at a distance. I had to take it apart and remove all the plastics. I also made the adapter for 9mm lenses, but with a little longer use, the lenses break. I will wait to see how this 9mm, which is for infrared light, will be. The bad thing is that I can't do close focus with this photo lens. Focus is only after about 3 meters. An adapter must also be made, which will not be a very easy task, and it must be right in the center. I also removed the fiber from the 120W one, but I'll have to drill it as well. Very likely to damage it if particles get inside. In general, it is not worth one's time to deal with these pumps without tools to remove the fiber.

 

[Borislav@87]

New update. I removed the lenses after the cube on both lasers and now I get a solid output beam that expands very little. With the lenses, the expansion is very aggressive, because there the focus is right in front of them so that it can enter the fiber. So, if someone is going to do like my project, it is good to know that there should not be a lens after the cube. I easily opened the 120W laser. The top cover turned out to be very thin. I sanded the front with a file until a gap was visible. Then I inserted the blade of the knife and opened it like a can. When drilling, I had put thin nylon inside and extra tape. So I prevented anything from getting inside. I periodically blew with a lens dust pump. I will experiment with the lens, how will it be. This will happen in the next few days when I find time.

 

[Borislav@87]

260W

 

[RedCowboy]

Now that you have removed the fiber coupling optics you can use a concave followed by a sliding convex to zoom focus your beam bundle.

Avoid contaminating the optics, even a layer of dust that you can't see will rob power, so it's better to shake out the shavings after drilling out your exit hole and glue on a window or a concave lens to keep moisture out.

Your beam bundle spot looks good, a concave and convex pair should work well or you could use a 3X beam expander, actually there are a lot of nice beam expanders AR coated for NIR on ebay.

Here are some I have scored from ebay.

 

[Borislav@87]

@RedCowboy
Yes, there are extenders. I don't know what to do. This camera lens performs well. The thing is, I want to do something portable, and these lenses are a big problem. I didn't have to remove the 260W pump lenses. With them I was getting a lot of small specks in the distance through the lens. Right now without them with the lens from the camera I can't do this little spot. Also, 9mm lenses no longer fit with the adapter. Putting them does nothing. They used to do a good focus, but now it can't.

I just found this on AliExpress:
BGN98.77 | 532nm 632.8nm 1064nm Laser Beam Expander 12x/15x/16x/18x/20x

https://a.aliexpress.com/_EzuQa2M

 

[RedCowboy]

That's NOT an adjustable beam expander, that's a FIXED beam expander. It's also AR coated for532nm.

 

[Borislav@87]

That's NOT an adjustable beam expander, that's a FIXED beam expander. It's also AR coated for532nm.

I don't know about the coverage but it is adjustable. I can focus on this 420-800mm. The one I linked to has an option for Infrared as well. You can see in the selection on the site

 

[RedCowboy]

Those are made for engraving lasers and the nm range is the AR coating range.

 

[RedCowboy]

@RedCowboy
Yes, there are extenders. I don't know what to do. This camera lens performs well. The thing is, I want to do something portable, and these lenses are a big problem. I didn't have to remove the 260W pump lenses. With them I was getting a lot of small specks in the distance through the lens. Right now without them with the lens from the camera I can't do this little spot. Also, 9mm lenses no longer fit with the adapter. Putting them does nothing. They used to do a good focus, but now it can't.

I just found this on AliExpress:
BGN98.77 | 532nm 632.8nm 1064nm Laser Beam Expander 12x/15x/16x/18x/20x

https://a.aliexpress.com/_EzuQa2M

The reason the standard 3E-G2 lens worked with the fiber coupling optics in place was because your output from the beam coupling optics was closer to our favorite laser diode outputs, but now you need either a long focal length lens ( binocular or rifle scope objective lens ) you know, one with a thick edge or a beam expander or self made expander ( concave + convex ).

Obviously you can use the factor beam coupling optics with a 3E-G2 lens and a beam expander.
Of course everything needs to be aligned for best results.

Note* Anyone working with NIR lasers should be extra cautious, use the proper safety equipment ( Laser Safety Glasses or Attenuation goggles ) and be safe!