Laser bounce mirrors on the cheap…

by Stephen Hobley on February 20, 2011

I was looking around for a way to quickly put together some adjustable bounce mirrors and came up with the following.

Quick \'n\' Dirty laser bounce mirrors

I already had some 1″ square front surface mirrors, so I went out and bought some brass hinges and magnets from a local supermarket. Using pliers I pinched the hinges so that they no longer turned freely.

Finally I fixed the mirrors to the hinges, and the hinges to the magnets using some foam tape.

I then attached the mirrors to a steel beam – the magnets let you turn the mirrors, and the hinges let you adjust the angle. They work reasonably well – I used them in the latest (and almost certainly the last) laser harp I built.

Blue Laser Harp Test

Blue Laser Harp Test

This is the first time I’ve tried a 445nm laser – this one is just under 1W. Visibility is not quite the as high as with the 532nm – but that’s to be expected. Since I was using the small bounce mirrors I rewrote the open/close effect to better suit them.

I think I might need thicker gloves, I can certainly feel the laser through the thin-walled ones I’ve been using.


{ 6 comments… read them below or add one }

P.A February 21, 2011 at 5:31 pm


where do you put the photodiodes with this new configuration ?

Stephen Hobley February 21, 2011 at 5:46 pm

This is still experimental, it’s not using photodiodes at the moment – but still needs some work.

P.A February 22, 2011 at 2:11 pm

and could you send me your code for the new open/close functions ?
I like this effect 😉

Stephen Hobley February 22, 2011 at 2:30 pm

P.A. – I sent you an email.

Carl September 11, 2012 at 3:34 pm

Hi Stephen,
I really love this. I’m looking to bounce one static red laser off of several mirrors throughout a space, similar to a heist-film but I’m not sure where to start looking for a projector. Most projectors don’t have this static function, and I imagine it requires a code. Can you suggest a website, projector, or program that is reasonably cheap? I appreciate it very much!

Stephen Hobley September 11, 2012 at 3:36 pm

Hi Carl,

Surely you just want the laser and the mirrors for this?
You only need a projector if you want the laser to move.


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