Prisms for 445nm diode front surface knife edging

[chad]

That is great! Thanks!

Chad

[dsli_jon]

Hey Alex -

Here is the transmittance curve of the PBS. This curve shows the broad band coating 445-700nm. The transmission is >90%. For narrower bandwidth, let me say 440-490nm you can get >95%.

Umm, forgive me if this is 'obvious', but, I am guessing with posting this graph, you're 'implying' that these prisms FS, are simply '1/2' of that-referenced PBS? Obviously, for us 'knifers' we are concerned with max R-efficiency, not T... 95% R would be 'fatal', and anything less than about 99.5% or-better R, is kinda... 'meh'... I do-see the 'desireable-number' in Post#1, but... Just to clarify before we send funds for 60 pcs..

PM you shortly...
Danke..
j

[lasertack]

@Chad

Just to make it clear. The posted graph #62 shows a data of a PBS cube, not of the prisms. I think it was a bad idea to post it here but I was asked for it. The prisms still have >99,5% reflectivity. Don´t worry, Chad

[dsli_jon]

The prisms still have >99,5% reflectivity. Don´t worry, Chad

No problem, Ted... ..thanks for the re-assurance...
j

[planters]

Lasertack,

OK, I'm hooked. You got a SEM perchance? Just kidding. Seriously, this level of sophistication is eye opening. The profiles on those two lenses are very useful. I am intrigued by the aspheric lens. What is the source of this lens and do you know it's divergence? To avoid any confusion regarding the recent discussion on divergence the O-like lens produces a far field spot at 10 M of 3mm x 17mm and is quoted to have a divergence of 0.3 mrad x 1.7mrad.

I know that the discussion is drifting a little from your original sales offer, but in my defense your prisms are likely to improve the performance of my projectors and now I suspect you may have a lens that could further improve them.

[lasertack]

@planters

Hi,

I´ve also opened a thread for the aspheric lenses days ago. I sell them, too. Please follow this LINK

Alex

[danielbriggs]

Alex,
Prisms have arrived today, many thanks; will have them under the scope tomorrow.
Regards,
Dan

[lasertack]

Alex,
Prisms have arrived today, many thanks; will have them under the scope tomorrow.
Regards,
Dan

Ok, looking forward to see some pics

[danielbriggs]

Dear all,
Below are a couple of images from the 445nm right angle mirror prisms.
I ran it though the Zeiss only on a 10x objective as that seemed appropriate; higher magnifications can be done if required.
I have taken the images along the knife edging side that would be used; and stitched together 20 frames in the Z-depth in an attempt to show the radius / flat on the edge clearly. I ran the full length of the prism and post-stitched.
The lower portion is the coating, the middle is the flat / radius. Chad, you were bang on the money with the radius!


Section:




Tiled Image:




Dimensions:








Download link to full TIF images (~15MB}
http://danielbriggs.co.uk/laser/pris...tif_prisms.zip



If anyone would like any more detail or anything done differently, please let me know.

If I am honest I would be a little happier with 7x7mm as it gives a bit more margin for error, but still very much useable at 5mm.
The long and short of it; these are brilliant. I will be ordering a bucket full.

Thanks again to Alex for lending me the prisms.

Best Regards,
Dan

[lasertack]

@Daniel

Great work, Daniel!

Thank you very much for sharing the pics.

Alex