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Use of filters to reduce speckle

Use of filters to reduce speckle

Postby ArchaeoPhoto » Wed Jan 20, 2010 11:04 am

Hello Davidians,

while constantly trying to improve my setup, I often wondered how I could get rid of the speckles and secondary emissions of the laserbeam
to get an even thinner laser line. A not-so-quick search brought up this website:
http://www.lasercomponents.com/de-en/pr ... e-filters/ (Site is German/English)
They are specialized in various aspects of optics in general.
I phoned one of their specialists and they were very helpful (and patient). It seems to be possible to get a very,very thin line using dedicated filters in front of a) the laser and/or b) the cam.
Unfortunately, these filters are not very cheap. Prices vary but I guess 100€ is a good estimation.

Well, I wanted to share this with you. Maybe someone finds this helpful (I'm thinking of Mattia here :wink: )
If anyone has already experience with this, I am happy to recieve comments. Maybe there is a cheaper way, or it's not necessary at all...

Thorsten
Laser: Green 5mW & 15mW focusable laser; Cam: Color CCD 1280px + Computar 8mm Lens; PC: HP Laptop with 8Gb RAM; Software: David Pro USB, Meshlab, Blender, PS CS4
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Postby hal » Sat Jan 23, 2010 12:43 pm

Hi Thorsten,

Very interesting. Thank you very much.
The only test that I've done, time ago, was with a green and thin plastic sheet in front of the camera, using a Green Laser.
This isn't so professional, but reduce a little envirormental noise (not green colors) and, just a little, the diffuse spackle effect.

Bye,
Mattia
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