Towards atom interferometry in an anti-resonance fiber

• Main Author: Ang, Joseph Sebastian
• Other Authors: Lan Shau-Yu
• Format: Final Year Project
• Language: English
• Published: Nanyang Technological University 2021
• Subjects: Science::Physics::Optics and light
• Online Access: https://hdl.handle.net/10356/148379
• Institution: Nanyang Technological University

Atom interferometry inside hollow-core fibers (HCF) is a relatively new technology which promise improvements upon free space atom interferometers. In this project, the initial steps are taken to build a robust setup inside a custom-made anti-resonance HCF. A magneto-optical trap scheme is assembled to trap Rubidium-85 atoms and cool them down. Sub-Doppler cooling is further achieved using polarization gradient cooling. The trapped atoms reached temperatures of around 10 µK. These atoms are then loaded into the HCF using a dipole trap as a guide, and the quality of atomic loading is optimized through measuring the optical depth and temperature of the atomic cloud inside the HCF. Afterwards, a coherence measurement is taken using a Ramsey interferometer scheme to indicate about 3 ms coherence inside the HCF. The steps done in this project will serve as the foundation for future experiments of various atom interferometry schemes inside the HCF.