Wavefront-splitting interferometer based on orbital angular momentum beams
Dong Yang, Zhongming Yang, Yanfeng Zhang
Abstract
Orbital angular momentum (OAM) interferometers have attracted great attention in metrology. However, OAM interferometers usually have large sizes and are difficult to align. OAM-based wavefront-splitting interferometer (WSI-OAM) can achieve nano-displacement measurement with compact size and easy to align. In this manuscript, we propose and demonstrate a nano-displacement measurement system based on WSI-OAM. A resolution of 0.1 nm with an uncertainty of 0.013 nm is achieved with measurement accuracy higher than 99.87% and linearity close to 99%. This work offers a practical approach to miniaturize and integrate OAM interferometers in metrology.
Topics & Concepts
Astronomical interferometerOpticsWavefrontInterferometryMetrologyPhysicsAngular momentumAngular resolution (graph drawing)Displacement (psychology)Wavefront sensorLinearityMathematicsQuantum mechanicsCombinatoricsPsychologyPsychotherapistOrbital Angular Momentum in OpticsOptical measurement and interference techniquesOptical Coherence Tomography Applications