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Project 2.2 : Near-field Talbot-Lau Atom Interferometer


            Matter-wave interferometry can be applied for precision metrology with electrons, atoms and small molecules, in particular for the measurements of all kinds of inertial forces for instance the variations of the rotation of the Earth, local gravity acceleration (g) as well as gravity gradients. The knowledge of inertial forces is important for many fields and applications: geography, and geology, e.g. the gravity gradients can be caused from Earth quakes, geological deformations, waves (Tsunamis) and also the exploration of natural resources, e.g. crude oil. In physics, the general relativity can be observed and better understood if one can search the gravitational waves, or even the fundamental constants, e.g. Newton’s constant, fine structure constant. The quantum mechanics of matter-wave interferometry can serve for the space applications, with space satellites, and eventually future space missions.


            In this research project, we will realize the first matter-wave interferometer in Thailand. The research project is relied on the strength of matter-wave interferometry that is sensitive to external perturbations or external fields which overcomes a light interferometry. Therefore, it provides an idea of the measurement of local gravitational field, namely gravimeter. Our new scheme is based on near-field optics instead of far-field regime. Therefore, we aim to have a simple and compact gravimeter with good performance and reasonable high precision. The aim of the estimation of uncertainty at least   ∆g/g=10-7 with the condition of using a cold atomic source, which is in the range of practical applications such as geological purposes, will be performed.


Figure 2.2.1 A sketch of the gravimeter based on the near-field matter-wave interferometry.


Principal Investigator: Associate Professor Dr. Sarayut  Deachapunya 1)
Collaborator: Asst. Prof. Dr.Sorakrai Srisuphaphon 1), Asst. Prof. Dr.Waranont Anukool 2), Assoc. Prof. Dr. Surasak Chiangga 3)
Affiliated Institutes: 1) Department of Physics, Faculty of Science, Burapha University, 2) Department of Physics and Materials Sciences, Faculty of Science, Chiang Mai University, 3) Department of Physics, Faculty of Science, Kasetsart University