Old 01-18-2015, 07:18 PM #1
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Default Wavelength Division Multiplexing

Video by username planters, here and on PL



So basically what he's doing is using prisms to combine (not to scale, color difference greatly exaggerated):



Of course, the difference in angle of refraction is so low that you need a lot of distance for these beams to converge. So NO, you cannot put this in a pointer. I think he could do away with one prism though:

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Wavelength Division Multiplexing-wavelength-division-mutiplexing.png   Wavelength Division Multiplexing-wavelength-division-mutiplexing2.png  


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Old 01-18-2015, 07:43 PM #2
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Default Re: Wavelength Division Multiplexing

If memory serves, this is the basic principal that MBDA uses in their 40 kW laser gun.
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Old 01-18-2015, 09:03 PM #3
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Default Re: Wavelength Division Multiplexing

I have been following his thread on PL. I am honestly surprised he got such effective results! Pretty cool to see, for sure. I do wonder if it will ever be practical for use in projectors, though.
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Old 01-19-2015, 05:34 PM #4
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Default Re: Wavelength Division Multiplexing

When you write this method is not suitable for a pointer due to the distance needed, roughly what amount of distance do you think is needed?
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Old 01-19-2015, 11:21 PM #5
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Default Re: Wavelength Division Multiplexing

That depends on the prism, prism angle, and the distance between wavelengths. Several feet minimum.
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Old 01-21-2015, 03:40 AM #6
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Default Re: Wavelength Division Multiplexing

Thanks, I could live with three to four feet, but longer than that and difficult to hold up. I once happened upon an article where someone had built a multiplexer out of a fiber optic piece of glass with a bubble in it where the fiber was expanded by heat.
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Divergence Calculator: pseudonomen137's JScript mRad Calculator - Measure your lasers beam dia. at 1 foot & then 20'.

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Old 01-21-2015, 03:41 PM #7
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Default Re: Wavelength Division Multiplexing

Quote:
Originally Posted by rhd View Post
If memory serves, this is the basic principal that MBDA uses in their 40 kW laser gun.
Or maybe not:

MBDA's laser weapon destroys artillery models
MBDA said that its favored approach was to combine multiple fiber lasers in relatively simple fashion, using both a common output aperture and focusing element.

Alternative approaches include coherent or spectral beam combining, but these would require a more complex optical design and would likely prove difficult to achieve with off-the-shelf industrial laser sources.

The link High power Laser directed energy weapons becoming feasible through beam combining technologies has a scheme of the system.

In the prism system it is necessary to take care of polarization and prism coatings. Otherwise the combining efficiency can drop significantly.
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