Polarizing Beam Splitter Cube Delamination

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Hi:

1-What causes polarization coating (the hypogenous interface) of a Polarizing
Beam Splitter Cube go bad and sometimes delaminated?  I could think of
humidity+temperature.


2-Do you of any company and supplier who have Polarizing Beam Splitter Cubes
without this problem?
We'd like BPS Cube to have a "3 deg fielField of View" and " Extinction Ratio
>500".  Operating Wavlength is ~900nm

Your supplier suggestions and comments are greatly appreciated.

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