Welcome to Laser Pointer Forums - discuss green laser pointers, blue laser pointers, and all types of lasers



Laser Pointer Store

Wavelength Division Multiplexing

Cyparagon

Well-known member
Joined
Sep 12, 2007
Messages
9,586
Points
113
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:

 

Attachments


rhd

New member
Joined
Dec 7, 2010
Messages
8,492
Points
0
If memory serves, this is the basic principal that MBDA uses in their 40 kW laser gun.
 

crazyspaz

New member
Joined
Jul 4, 2012
Messages
2,863
Points
0
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.
 

Alaskan

Well-known member
LPF Site Supporter
Joined
Jan 29, 2014
Messages
10,633
Points
113
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?
 

Cyparagon

Well-known member
Joined
Sep 12, 2007
Messages
9,586
Points
113
That depends on the prism, prism angle, and the distance between wavelengths. Several feet minimum.
 

Alaskan

Well-known member
LPF Site Supporter
Joined
Jan 29, 2014
Messages
10,633
Points
113
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.
 

lazeristasUVISIR

Active member
Joined
Jan 5, 2011
Messages
404
Points
28
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.
 




Top