Gravitational Wave Group

Contamination Speed due to cryogenic molecule absorption

Contents

In this experiment, The reflectance of an ultra-low loss dielectric multilayer coating mirror ,which was cooled at 10 K and exposed to 300K vacuum space, was monitored as the finesse of a Fabry-Perot cavity for two months.

Experimental Setup


Setup for finesse measurement



Exposure of the input mirror to the 300 [K] vacuum space.

Result

The reflectance was measured to decrease with a rate of 0.12^{+0.12}_{-0.08} ppm per day.