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Old 05-10-2013, 04:27 PM #17
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Default Re: 48w + 445nm handheld laser module

I think he means to stack pbs cube after pbs cube in a long chain. I'm calling this a doomed failure right now; it's not going to work.


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Old 05-10-2013, 04:32 PM #18
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Default Re: 48w + 445nm handheld laser module

Quote:
Originally Posted by daguin View Post
<-- waits to **see** what the heck he is trying to do -- Without knife edging (and stacking), I don't understand it

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going to make new video now add upload it in the next 30min.
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Old 05-10-2013, 04:33 PM #19
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Default Re: 48w + 445nm handheld laser module

PBS cubes can only be used once in a system of same wavelength diodes, unless I missed something.
If you shine the output of a PBS cube into another cube it will split the beam, not combine.

What most people do is take the amount of diodes they are going to use, divide that by two and knife edge those two groups separately, then combine with a PBS cube/waveplate.
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Old 05-10-2013, 04:41 PM #20
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Default Re: 48w + 445nm handheld laser module

What exactly does the waveplate do? I know you can combine without it does it just help the beam profile?
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Old 05-10-2013, 04:54 PM #21
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Default Re: 48w + 445nm handheld laser module

Quote:
Originally Posted by Speedy78 View Post
What exactly does the waveplate do? I know you can combine without it does it just help the beam profile?
Normally to change the polarization you have the rotate the diode 90 degrees, so with multimode diodes it would go from | to -.

So then when combining two diodes, one | and one - you get a + shape.
Example:


With a waveplate you can polarize the beam without rotating the diode 90 degrees so that people can combine | and | to make |. Allows it to overlap perfectly.

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Old 05-10-2013, 05:02 PM #22
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Default Re: 48w + 445nm handheld laser module

Ahh ok thanks for that clearification.
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Old 05-10-2013, 05:12 PM #23
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Default Re: 48w + 445nm handheld laser module

http://youtu.be/OeKtVIcHFhonew video hope this help

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Old 05-10-2013, 05:31 PM #24
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Default Re: 48w + 445nm handheld laser module

I've seen the last video and it is taking shape, good luck with the project

now waiting for the next steps, the topic promises
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Old 05-10-2013, 05:33 PM #25
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Default Re: 48w + 445nm handheld laser module

Have you tested this with more than two diodes?

The light that comes out of the first two sets of diodes is polarized in both directions, so when adding another cube one of the first two diodes you combined will go straight, and the other will go out the side.

I don't think this will work, but I would love to see it working with more than two diodes.
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Old 05-10-2013, 05:38 PM #26
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Default Re: 48w + 445nm handheld laser module



Yeah, that'll NEVER work. It's against the laws of physics. I'll let someone else explain how. Kudos for the attempt though.

Next time, at least try your idea before telling the world it's a Big Break-Through for the laser hobby.
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Old 05-10-2013, 05:55 PM #27
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Default Re: 48w + 445nm handheld laser module

A PBS (polarizing beam splitter) is used to selectively reflect or transmit light based on its polarization. Basically, to split light into two beams made up of two orthogonally polarized beams.

We just use them backwards, providing two orthogonally polarized beams, and the PBS superimposes the beams into one.
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Old 05-10-2013, 05:59 PM #28
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Default Re: 48w + 445nm handheld laser module

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Old 05-10-2013, 06:09 PM #29
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Default Re: 48w + 445nm handheld laser module

Quote:
Originally Posted by Cyparagon View Post


Yeah, that'll NEVER work. It's against the laws of physics. I'll let someone else explain how. Kudos for the attempt though.


Next time, at least try your idea before telling the world it's a Big Break-Through for the laser hobby.
I will put up A video for you this weekend showing 2 beam and the beam coming out like this( l ) and not like this (+ ) would that work ?
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Old 05-10-2013, 06:14 PM #30
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Default Re: 48w + 445nm handheld laser module

I think everyone needs to see the third laser added and the second cube without resplitting the beam as a proof of concept.
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Old 05-10-2013, 06:15 PM #31
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Default Re: 48w + 445nm handheld laser module

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.

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Old 05-10-2013, 06:18 PM #32
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Default Re: 48w + 445nm handheld laser module

They want you to combine at least 3 lasers using only the cubes.

You can rotate polarization using waveplate, so combining 2 lasers using a PBS and overlapping beams is easy still.

What they are getting at is, after you combine using a cube, you now have a beam comprised of one beam polarized |, and the other beam polarized -, but superimposed.

The use of a PBS is exactly to split a beam that has | and - polarization elements into two beams based on their polarization. So, once you send that combined beam through another cube to add another beam, yes the beam will be added into the beam. At the same time, another beam with the same polarization that is already present from the first cube, will be split out of the beam.

Pony Beam Spitter may be a better way to approach this problem.
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