Above value are generic specifications for fabrication, specific better value may be available and need to be reviewed case by case.

Raw germanium have a relatively average transmission in the IR (less than 50%) but Anti-reflect or DLC treatments do improve a lot it’s transmittance.

Visible window

Germanium famously known as predicted by Mendeleev before its actual discovery in the end 19th century, is widely used in optics as a component material for IR applications.  It has also interesting semi-conductor properties that we will not discuss into details in this guide.

Ge is also interesting for its low optical dispersion and therefore very low chromatic dispersion in it’s transmission spectrum.

Germanium glassproperties

Interestingly, due to its similar crystal structure to Diamond can be coated with a DLC layer (Diamond Like Carbon) which on top of reducing the reflection on it’s surface, adds a diamond strong protective layer. Finally Germanium is not transparent in the visible which can be useful to focus on IR light.

Germanium glasslens

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It does look better then the OSL script, but still it doesnt look like what i showed in picture 1 So how to get that flat beam laser effect ?

Unfortunately Germanium is sensible to high temperature with degradation of its optical properties over 100°C. For high temperature Mid-IR (8-13µm) alternative we recommend using BaF2 (! much lower transmission after 11µm) or ZnSe.

Germanium optical components along with Silicon ones are made by precision optical suppliers usually focusing on IR applications. Due to high value of the material, specialization enables these companies less pressure on the stocks and lower risks of non-quality rejection.

It has good transmission in the 8 to 14 µm range covering the thermal Infrared light, therefore it is a material of choice for thermal and night vision. It also shows a high refractive index which enable high open aperture angle optical component’s design.

Germanium GlassPrice

I’ve been trying whole day to get this with volume shaders and other light systems, but so far it didn’t look good. Sometimes as with smoke shaders, everyhting behind it became unlighted and not the target of the beam. I also tried an OSL laser sheet shader script, but i couldnt change its orientation, and its also not like the first image shown above, that rather seams a surface trick and doesn’t behave like light…

Edmund window

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Most of the raw material comes from China, Russia and USA being also important suppliers, quality material is available everywhere.

It is also worth noting that germanium is relatively more brittle that silicon and therefore should be handle with care during machining.

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I need to draw a flat wide laser beam, so not a point laser but, but a flat wide beam of laser light. So it does the projection of a line, I am after a cycles results similar like what you see in below pictures. Those pictures where not from cycles but from real world pictures found on the internet. Its how i would like it to be flat and with some smoke noise ? and a projecting light like F31LNI8MFLEP27Q9VD.LARGE.jpg1024×768 69.5 KB

So far the best looking shader reciept is this one : nCh4x.png1130×500 66.3 KB ( source : http://blender.stackexchange.com/questions/1096/making-a-laser-in-cycles-straight-beam-of-light )