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RepRap and lasers

Posted by SOI Sentinel 
VDX
Re: RepRap and lasers
May 19, 2010 02:07PM
... essentially it's a beamer and a light-curing polymer ...


Viktor
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Aufruf zum Projekt "Müll-freie Meere" - [reprap.org]
Call for the project "garbage-free seas" - [reprap.org]
Re: RepRap and lasers
May 21, 2010 02:55AM
DLP projectors are slowly getting cheaper, maybe one day I could afford one and use it for a structured light scanner and 3d printer?.
Re: RepRap and lasers
August 14, 2012 05:21AM
One of the most common types of Fibre lasers is the Erbium-Doped Fibre Laser. We use an otherwise-normal optical fibre, made out of silica glass. We add to it very small amounts of the rare-earth element Erbium. The small particles of Erbium are mixed in to the core of the fibre when it is made. This process of introducing small amounts of another element is called doping.
The reason we use Erbium is because the Erbium atoms have very useful energy levels. There is an energy level that can absorb photons with a wavelength of 980nm, and this then decays to a meta-stable state equivalent to 1550nm.
This means that we can use a cheap diode laser 'pump source' at 980nm and we get a very high quality, and potentially very high power beam out at 1550nm.
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