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Yup, Georgey sure is.Neil, I deleted my signature because "someone" thought it would make you go paranoid! I shall remain the "someone" secret though 
Some small amount (typically around 0.1% or less) of the laser light leaks out of the cavity and can be measured each time light hits one of the mirrors
Ahh... OK. I understand now  But, if we assume that the mirrors do not absorb ANY light, in an ideal world, then would it carry on going.. going.. going.. going.