You don't nee mirrors for a laser; in fact some type of media cannot use use mirrors as the light generation quickly changes to light absorption. https://www.r

You don't nee mirrors for a laser; in fact some type of media cannot use use mirrors as the light generation quickly changes to light absorption. https://www.repairfaq.org/sam/lasercn2.htm https://www.repairfaq.org/sam/lasercn2.htm "An Unusual Kind of Gas Laser that Puts Out Pulses in the UV". C. L. Stong, Scientific American, June 1974, pp. 122-127