I'm looking for a polymer (or even a type of tape) that can be used with high energy lasers in photoacoustic experiments.
The material must be able to repeatedly be exposed to 500 mJ/cm^2 from a nanosecond (5 nanoseconds) or picosecond laser pulse (8 picoseconds) without burning AND it must have favorable acoustic properties (an acoustic impedance close-ish to water at 1.5 MRayls) AND it must be optically transparent in the range from 400-700 nm.
Is there anything even remotely close to being able to handle these types of energies/powers in a polymer form or would it all have to be glass?
I suggest the following:
Polycarbonate
Polymethacrylate
Polyethylene Terephtalate and similar polymers
You haven't told us the wavelength of the laser, but I'm guessing that you need to avoid feeding into an absorption band of the polymer. It might be best to stay away from anything aromatic or with potential conjugation. Maybe the cyclic olefin copolymers might be a good option. Check out Topas.
http://www.polyplastics.com/en/product/lines/topas/general_e.pdf
You may try poly(thiourethanes) based on aliphatic components only and check the properties according to your schedule by establishing the necessary crosslink density using either tri- or tetra-SH-functional polythiols (e. g. provided by Chemische Fabrik Otto Bock GmbH in Germany) and di- or tri-NCO-functional isocyanates, e. g. isophorone diisocyanate or trimerized hexamethylene diisocyanate (provided by Covestro as Desmodur N3300 or N3900).
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