An optical-loss measurement system based on a resonant Fabry–Perot cavity at 1.06 μm in vacuum has been developed for independent monitoring of the cavity total loss and the optical absorption loss. Maintenance of cavity resonance over a one-month period allows the assessment of long-term degradation of the cavity optics in the presence of outgassing materials, with sensitivities of 5 ppm/yr for total cavity loss and 2 ppm/yr for cavity absorption loss. Test results for light-emitting diodes, Kapton-insulated cable assemblies, and Vac-seal epoxy adhesive are given. Scaling of these results to the optical performance requirements of LIGO is discussed.
© 1999 Optical Society of America
(000.2780) General : Gravity
(050.2230) Diffraction and gratings : Fabry-Perot
(140.0140) Lasers and laser optics : Lasers and laser optics
(290.4210) Scattering : Multiple scattering
(300.1030) Spectroscopy : Absorption
Daqun Li, Dennis Coyne, and Jordan Camp, "Optical Contamination Screening of Materials with a High-Finesse Fabry-Perot Cavity Resonated Continuously at 1.06- νm Wavelength in Vacuum," Appl. Opt. 38, 5378-5383 (1999)