Projector AR window

[Heavyen]

I have bought Anti-Reflection (AR) Coated High Efficiency Window from edmund optics and i have noticed it has high reflection for my blue lasers. (visualy estimated, it seems quite a lot and so im worried.)
So i am wondering how much of reflection is still safe for blue diodes, because i dont want to fry them

[steve-o]

Just make sure that the beam is not reflecting directly back to the diode(s) output aperture window (adjust your AR window angle at lowest possible diode power).

[planters]

I have the same VIS zero degree coating and measured the 445 reflectance to be 1-2%. It looks brighter and I discovered that some of this appearance is due to anything less than scrupulous cleanliness at this wavelength. This is a good argument for First Contact or the Stanwax product (I have no affiliation).

[andy_con]

I don't have this issue and I use ar windows from edmund

[norty303]

Have you got it the right way round? Some are only coated one side.

[kecked]

I used their windows for years. A bit thin but they work well. If you really want to waste money buy a sapphire window or such though I think those are for IR.

[dilbert]

I use a 1mm AR from edmunds with no problem on 445

[andy_con]

get the 3mm thick window then

[Heavyen]

Well AR coating is on both sides, so there shouldnt be a problem with orientation.
About placing it at angle, im afraid im little too short on space to use such technique.
well at specifications its written that at blue wavelenght the reflection should be around 5% could this be enough to damage diodes?

[dilbert]

Which window did you use?? Mine has 0.3% reflection and 96% transmission on 445 and blue is the worst - its 99% for red & green.