- Rubidium Bose-Einstien condensate setup
This experimental setup has been built with some novel elements to the approach of producing BEC.
Two variations of this experimental setup for generating BEC of ultracold 87Rb atoms have been made operational.
The first of these setup used 87Rb that are evaporatively cooled in a magnetic trap. A novel approach has been employed for preparing a
Bose-Einstein condensate (BEC) of 87Rb atoms using electro- pneumatically driven transfer of atoms into a Quadrupole-Ioffe magnetic trap (QUIC Trap).
The second of these setups (the current setup) uses an hybrid trap (Optical and magnetic gradient confinement)for trapping Rb atoms and achieving BEC by forced evaporative cooling.
This same experimental platform is being used to perform the experiments on Quantum-Classical crossover, and this setup will also be used to engineer
long range interactions between Rb atoms for studying novel phases of matter. Fig: time-of-flight images of the BEC phase transition observed in our hybrid trap (image:Sumit Sarkar's thesis)
- Strontium Magneto Optical Trap (MOT) setup
The second experimental setup is being built using Strontium (Sr) atoms. This setup would form the essential
part of the Atom+Plasmon coupling studies. The long-lived metastable states in Sr would enable coherent manipulation
of the atomic state for Quantum information studies. As a part of the construction of this setup, the group has been
indigenously developing a variety of technology. We have successfully constructed frequency doubling system for generating
461 nm from a 922 nm laser light source with an efficiency of over 30%. We have also designed and built a variety of
Data-acquisition and control systems to replace expensive and imported systems. A compact Atomic beam source of Sr has been
constructed and preliminary spectroscopic signals of various Sr atoms have been obtained. This spectroscopy system will be useful
in stabilizing the laser for cooling of Sr atoms. Fig: scattered 461 nm light from the trapped laser cooled strontium atom cloud