LAMP-SEMINAR
TOWARDS BOSE–EINSTEIN CONDENSATION OF LASER-COOLED POLAR MOLECULES
Speaker: ARIJIT CHAKRABORTY (Senior Research Associate, Quantum Engineering and Technology Lab, Integrated Quantum Network Hub, University of Bristol)
Achieving quantum degeneracy of polar molecules requires overcoming fundamental challenges in molecule number, collisional stability, and phase-space density. In this work, I present the design and implementation of a third-generation experimental platform aimed at realizing quantum degenerate calcium monofluoride (CaF) molecules. The new system was engineered from the ground up to address key limitations of earlier apparatus. A redesigned cryogenic buffer gas source improves molecular flux and velocity distribution through optimized helium delivery and enhanced thermalization. A newly developed science chamber integrates cryogenic shielding to reduce blackbody radiation, PCB-based magnetic trapping coils compatible with low temperatures, and high-voltage electrodes enabling strong electric-field gradients for collisional shielding. In parallel, polarization modulation of the slowing laser beam was implemented to enhance Magneto Optical Trap loading efficiency, significantly increasing the number of trapped molecules. These technical advances collectively improve molecule number, lifetime, and control, providing a robust and scalable foundation for sympathetic and evaporative cooling toward quantum degeneracy. This third-generation platform establishes the necessary infrastructure for pursuing Bose–Einstein condensation of directly laser-cooled polar molecules and exploring strongly interacting dipolar quantum matter