Optimizing Laser Beam Expansion for Long-Distance Scanning Applications

[moapz]

i want to create laser expander, that scan the wall; with 3m x 3m dimension and 50m distance from this expander. and using with two Rotary Prism mirrors; one for "x" movement and another for "y" move.
is there anyone help me.

 

[Andy Resnick]

This is a fairly standard problem: place the prism surfaces confocal to the focal point of an f-theta lens:

http://www.edmundoptics.com/onlinecatalog/displayproduct.cfm?productid=2961

Then it's all geometry. In fact, there are commercial solutions: look around and copy their design.

 

[moapz]

This is a fairly standard problem: place the prism surfaces confocal to the focal point of an f-theta lens:

http://www.edmundoptics.com/onlinecatalog/displayproduct.cfm?productid=2961

Then it's all geometry. In fact, there are commercial solutions: look around and copy their design.

thanks andy.
can you introduce reference for optic or laser beam?

 

[Andy Resnick]

thanks andy.
can you introduce reference for optic or laser beam?

I don't understand what you mean.

 

[moapz]

I have 2 rotary prism-pair mirrors.
first, laser beam illuminate and encounter to first rotary prism mirror (make it like Cone with 5face). it help beam to scan X line. (line width is 1cm)
now this scanned line,reflected to other prism (like cylinder but with face,5face) and this line scanned again for scanning Y axis. and now we have 1x1 rectangle.
i want to magnifying this 1cmx1cm solid picture, by using Correct lenses for presentation. this image should be create in 50m far from this machine. and it's image should be at least 2.5mx2.5m.

i don't have enough knowledge about find focal length or using correct lens for magnifying this picture for create far image !

 

[Andy Resnick]

It's just geometry- for example, you say the scanning mirror generates a 1 cm line, how far from the mirror is the 1 cm line? Clearly, as you get farther and farther away, the size of the line (rectangle) will increase.

What I am asking about is the *divergence* of the scanned beam. Instead of linear sizes, think about the angles- through what angle is the beam scanned?

 

[moapz]

It's just geometry- for example, you say the scanning mirror generates a 1 cm line, how far from the mirror is the 1 cm line? Clearly, as you get farther and farther away, the size of the line (rectangle) will increase.

What I am asking about is the *divergence* of the scanned beam. Instead of linear sizes, think about the angles- through what angle is the beam scanned?

sorry,but problem is here. i don't know how far from mirror it can be created.
i saw this project : http://hackedgadgets.com/2006/07/10/home-built-laser-projector/"
can i use "Laser Pointer Pen" (for first try) for laser?
and should i use lens for magnification, for 60m long?