GLOBAL IMAGING BRIEF
Why it matters
Analysis: Compatible auxiliary wavelengths can remove one integration barrier for lower-noise coatings, pending full-scale mirror and observatory validation.
Infrared Locking Method Addresses Crystalline-Mirror Coating Constraint
University of Western Australia researchers reported on October 16 a laboratory-tested 1596 nm arm-length stabilization scheme for gravitational-wave interferometers. It avoids the green-light absorption problem expected with proposed AlGaAs/GaAs mirror coatings and demonstrated a repeatable handover to the main laser. The test does not establish an installed detector sensitivity gain.
Original source
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