title: Optical resonators with ten million finesse.
abstract: We report a significant improvement of the finesse and quality factor of a calcium fluoride whispering gallery mode optical resonator achieved with iterative thermal annealing. The initial and final values of the resonator finesse are F(i) approximately 5 x 10(5) and F(f) >/= 10(7) respectively. The measurements are conducted at room temperature in the laboratory atmosphere.
authors: Anatoliy A
authors: AA
authors: Savchenkov
authors: Andrey B
authors: AB
authors: Matsko
authors: Vladimir S
authors: VS
authors: Ilchenko
authors: Lute
authors: L
authors: Maleki