Been a while since I have been around here, took a break from lasing for a while, but recently started working on designing and building a hopefully functional flash pumped ruby laser, been experimenting with some large flash lamps, at relatively lower energy levels with regards to a powerful laser, approx 150 joule discharges as of now. Been experimenting with flash indicator bulbs for cell towers and such. waiting for an INP3-7/80 tube I purchased on eBay. Currently my hold up is, i seem to be having issues figuring out what types of mirrors I need for the resonant cavity. I understand the concept of HR on one side and OC mirror on the other side for the output, but how do I select which mirrors to use? HR mirror just needs to be able to handle the discharge energy right? OC mirror should be coated and designed for the output wavelength? Along with being able to handle the energy at hand. Am I missing anything? Most of the articles I have been reading seem to leave out the details about the mirrors. Hopefully someone here will be able to assist me in my endeavors.