Can anybody suggest where to purchase ready to use or to manufacture several beam splitting cube pairs coated for all visible range (0.4 - 1 um), with a size of 15 or 20 mm, 30% - 70% and 70% - 30% intensity dividing coefficient (meant for unpolarized light).
Googling points out general info on well-known sellers, but they have different cubes for only 300 nm range coating, while I need wide band coating for a single cube. Any ideas?
Alessio, "Googling points out general info on grand well-known sellers, but they have different cubes for only 300 nm range coating" - this means I have tried all WELL-KNOWN companies, including Thorlabs, but thanks anyway
Did you try as well Edmund Optics, Newport, Comar, they are not so famous as Thorlabs, anyway you can also ask for custom spec in a company, just phone them, they will be happy to help you in this.
Regards
Lambda has extreme broadband beamsplitter cubes.
This one is described as working from 350 nm to 2.1 um, although
the plotted reflectivity only goes from 400 nm to 700 nm. The cube itself
might still be useful up to 1000 nm:
http://www.lambda.cc/103.asp
CVI/Melles Griot also has a broadband beamsplitter. This one is
supposed to work from 650 nm up to 1 um.
http://www.cvimellesgriot.com/products/Broadband-Beamsplitters.aspx
I have purchased several optical items including BS cubes for non polarized light from Lambda, as David suggested. True indeed , those cubes have almost linear dividing coefficient, as required. Though I have got strange effect when used pair of cubes with supercontinuum laser. Registered spectrum has shown the presence of equally spaced narrow gaps.. So the cubes are indeed great, I am sharing this experience just in case others might be interested.
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