Real-time displacement measurement immune from atmospheric parameters using optical frequency combs
Date
2012-11-19
Authors
Jian, Pu
Pinel, Olivier
Fabre, Claude
Lamine, Brahim
Treps, Nicolas
Journal Title
Journal ISSN
Volume Title
Publisher
Optical Society of America
Abstract
We propose a direct and real-time displacement measurement using an optical frequency comb, able to compensate optically for index of refraction variations due to atmospheric parameters. This scheme could be useful for applications requiring stringent precision over a long distance in air, a situation where dispersion becomes the main limitation. The key ingredient is the use of a mode-locked laser as a precise source for multi-wavelength interferometry in a homodyne detection scheme. By shaping temporally the local oscillator, one can directly access the desired parameter (distance variation) while being insensitive to fluctuations induced by parameters of the environment such as pressure, temperature, humidity and CO₂ content.
Description
Keywords
atmosphere, equipment design, interferometry, lasers, light, scattering, radiation
Citation
Collections
Source
Optics express
Type
Journal article