IPL reflector research

A. Lots of reflectivity info available on the Internet. What wavelength and operating environment?

Aluminum (vacuum deposited) and silver are commonly used reflectors. Aluminum is best for far-UV & UV, silver is best for visible & IR. Unless used in vacuum or inert gas, both are usually given protective, transparent oxide 'dielectric' coatings. Aluminum is sometimes used uncoated, as in large reflector telescopes (in locations with clean, dry air), but then stripped and recoated every few years.

For high reflectivity over the entire UV to IR range, with scratch and tarnish protection, the following composite coating is suggested:
Al (base coat), 14 nm thick alumina (diffusion barrier), 25 nm Ag, 110 nm alumina, 140 nm layer of Sb2O3 or TaO3 (top). Optimal layer thicknesses are a function of wavelength; these values are for 550 nm light. From work by Nikos Drakos (University of Leeds), Ross Moore (Macquarie University, Sydney) and James R. Graham (UC-Berkeley).

For uncoated precious metals, rhodium is ~usable at low wavelengths (below 550 nm, green light) although not nearly as good as Al. Gold is good at higher wavelengths, as good as silver for IR and above.

? Hi Mithu. Please get back to us with at least 3 or 4 times as many words ...

... who you are, what you're trying to do, why, etc. Sorry, I have no idea what this question is about. Thanks!

Regards,