laser and cubes 2 max 445nm handheld laser module

Re: 48w + 445nm handheld laser module

I still don't understand, are you knife edging with cubes, or using multiple PBS' in a row?

A video with three diodes running and the resulting beam would clear this up.

As Dave said though, you should test this with three diodes running before buying x1,000 of them.

Re: 48w + 445nm handheld laser module

ARGLaser said:

I still don't understand, are you knife edging with cubes, or using multiple PBS' in a row?

A video with three diodes running and the resulting beam would clear this up.

As Dave said though, you should test this with three diodes running before buying x1,000 of them.

Click to expand...

I will using multiple PBS' in a row up to 10. one laser one cude 2nd cube 2nd laserso on and so on .
I have 6 module coming in for more testing
and I will not order more tell all testing is done lol thanks
will put up video of 3 working as soon as I get time.

Re: 48w + 445nm handheld laser module

May you post any photos of your project?

Re: 48w + 445nm handheld laser module

FatalaS said:

May you post any photos of your project?

Click to expand...

I put up some videos, but will put up photos soon

Re: 48w + 445nm handheld laser module

ARGLaser said:

I still don't understand, are you knife edging with cubes, or using multiple PBS' in a row?

A video with three diodes running and the resulting beam would clear this up.

As Dave said though, you should test this with three diodes running before buying x1,000 of them.

Click to expand...

He is aligning the reflected beams along the same path (or at least trying to)

He either doesn't understand the problems associated with polarity in this application or is unwilling to accept it

Also, he cannot be using good PBS cubes or he is simply using them "off angle"

It would seem to me, if he had good PBS cubes and he had the set up correctly, the beam from the first laser would not pass through the second PBS cube

Could he just not be aligning the PBS cubes with the polarity of the beam
This could allow both beams to pass, but with unacceptable losses, couldn't it?
It would seem that is why the next laser and the next cube is set at a 90deg angle from the one before it
It is all just a bunch of partially reflected beams

Could he be using some other type of cube to get partial reflection and partial pass?

Finally, isn't much of that wasted light (the light that is not passed) going to be converted to heat in the cubes?

Peace,
dave

Re: 48w + 445nm handheld laser module

This is the most accurate analogy of what is happening. I had similar troubles a long time ago.

I bought a PBS that was supposed to be coated for blue. I was losing all kinds of power. It was my first time working with a PBS and all my knowledge was only from reading "use PBS to combine beams." My first break through came when I searched and learned of polarization. This was good knowledge but did not help me. I put my project away for a while then learned that my PBS MIT not be coated for my wavelength. Turns out that was the problem.

Once you see a correctly coated PBS working properly with a correctly polarized laser. You know right away you got it right. You don't even need to set it with an lpm. Just simply rotate laser until you see the least amount of light coming out the Side of PBS that you don't want the light to be coming out of.

See Rick, what you aren't understanding is that yes, the laser furthest from the final PBS will go through all of them. It's all the other bent beams that are going to have the problem. The next in line laser must be correctly aligned and have the correct polarization to get bent in its cube, but by setting this one up for its own PBS, you now make it polarized in the wrong direction for the rest of the cubes.

Michael

daguin said:

He is aligning the reflected beams along the same path (or at least trying to)

He either doesn't understand the problems associated with polarity in this application or is unwilling to accept it

Also, he cannot be using good PBS cubes or he is simply using them "off angle"

It would seem to me, if he had good PBS cubes and he had the set up correctly, the beam from the first laser would not pass through the second PBS cube

Could he just not be aligning the PBS cubes with the polarity of the beam
This could allow both beams to pass, but with unacceptable losses, couldn't it?
It would seem that is why the next laser and the next cube is set at a 90deg angle from the one before it
It is all just a bunch of partially reflected beams

Could he be using some other type of cube to get partial reflection and partial pass?

Finally, isn't much of that wasted light (the light that is not passed) going to be converted to heat in the cubes?

Peace,
dave

Click to expand...

Re: 48w + 445nm handheld laser module

daguin said:

Could he be using some other type of cube to get partial reflection and partial pass?

Click to expand...

There are cubes that are designed to pass half and reflect half - irrespective of polarity.

ricktrent4 said:

The bad new is that after 16 cubes you get 0 power.

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Why, because 16*200mW=3.2W? Even if we break the laws of physics and allow >2 beam combinations using PBS's, that's not how it works. Think about it. What about if you only shine 200mW into it? Does that mean it blocks everything? Of course not - that would be ridiculous. Similarly, glass passes ~90% of light. Does that mean if you stack 10 panes, the glass is black? Of course not - that would be ridiculous. It's percent-based. With each added pane, you lose 10% of the remainder. The glass doesn't magically know what the original power was; it only knows that it can pass 90% of what goes through it.

After 1 pane: 90%. 100*.9
After 2 panes: 81%. 100*.9*.9
After 3 panes: 72.9%. 100*.9^3
After 10 panes: ~35%. 100*.9^10

Similarly, after 16 cubes, you'd be left with 1.14W. 3.2*((3.2-.2)/3.2)^16 or 3.2*(15/16)^16

Re: 48w + 445nm handheld laser module

chipdouglas said:

no. a pbs is always + that is where the polarization comes to play in PBS. one laser is polarized north, one is polarazed south. that is how 1 laser goes straight through, and the second laser gets relfected in the same direction as the first laser. you will not make this work with only PBS cubes. there is no way around this.
and a wave plate changes the north/south laser, and a wave plate is only really needed if your laser isnt in a round host that can be rotated on its own axis


Once again, go read what cyparagon wrote about testing with your real amount of diodes, and stop saying that you tested it with 2. We all know a pbs is meant for 2. Nothing new here.

michael.

Click to expand...

Your not get what I am doing! One laser one cub. 2nd laser next cube and so on. with 2 laser in 1-cube you will get this (+) but I am not doing that. I have done it through 3 at max power and will put video today I hope to show .did you see this video show 2cube beam coming out was like this(l) here is the video one more time show the 2 like this (l). That you told could not be done. glasse on cam beam shot 001 - YouTube

Re: 48w + 445nm handheld laser module

3 cubs working on proof of conceptproof video http://youtu.be/N4Ztf5_PMCA the LPM showed 2.7W
sorry were was a lot of light on the LPM but I think you can make out over 2w in the video I think I have done that was asked of me . was told I need more proof .

http://youtu.be/N4Ztf5_PMCA

Re: 48w + 445nm handheld laser module

So it a a giant twist with the cubes. I still think there wil be polarity issue when you start adding other laser but I could be wrong.

Re: 48w + 445nm handheld laser module

Speedy78 said:

So it a a giant twist with the cubes. I still think there wil be polarity issue when you start adding other laser but I could be wrong.

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if you look at the close up of the 3rd cube you can see that is in the right position right ,so if line the diode just right from the bottom it will work I shoot the laser through it in my hand and it came out right (l)

But some will not believe tell they see it all running LOL

Re: 48w + 445nm handheld laser module

Of course not. If it all works like you say it should then we could make some crazy powered portable lasers. So of course everyone wants to see it 100% working

Re: 48w + 445nm handheld laser module

Speedy78 said:

Of course not. If it all works like you say it should then we could make some crazy powered portable lasers. So of course everyone wants to see it 100% working

Click to expand...

if I showed the 3 working would that prove the concept ?
as you know the modules they sent me were not made right and I had to work on them, but I will try to get them line up the best I can to show it working.

Re: 48w + 445nm handheld laser module

Just like I told you in pm.... 1 laser can accomplish your end result. Your video proves nothing. Stop rebuting people here and build it already. I would love to be proved wrong.

Re: 48w + 445nm handheld laser module

chipdouglas said:

Just like I told you in pm.... 1 laser can accomplish your end result. Your video proves nothing. Stop rebuting people here and build it already. I would love to be proved wrong.

Click to expand...

OK , If you have 3 cubes and a laser you can do it too .I showed you how I had to have them line up. I know it works I did it and will show all the laser running as soon as I can. I do like you attitude :thinking:

ps I was getting 2.7W in LPM hard to see it in video

Re: 48w + 445nm handheld laser module

You should really set up the equipment before shooting the video, trying to get the glasses to hang off the camera?

I sacrificed one lens of my goggles and used blu tack to stick it to the camera, works well.