COURSE PAGE
PH603: Physics of Ultracold Atoms (MSc 4th Semester Elective)
Lecture 1 (06/01/2020):
Course Syllabus and teaching plan for this course was discussed
Lecture 2 (08/01/2020)
How Cold is Ultracold?, Quantum gas, atomic systems, Resonances, Atoms
and photons, Quantum Systems.
Lecture 3 (10/01/2020)
Doppler effect and laser, Doppler cooling of atomic gas using lasers
Lecture 4 (17/01/2020)
Concept of Doppler cooling revisited, Energy and Momentum Picture in detail,
Animations and Videos, Draw backs of Doppler cooling to reach Ultra low temperatures, Effect of Magnetic Field on atoms, Splitting of Hyper-fine lines and Zeeman effect.
Lecture 5 (20/01/2020)
Limitations of Doppler Cooling, Effect of Light and Magnetic Field on atoms
Lecture 6 (22/01/2020)
Concept of Zeeman Splitting, Spatial effects of light and polarization's on atoms,
Introduction to Magneto-Optical Trapping (MOT)
Lecture 7 (24/01/2020)
MOT and Doppler Cooling Sequence, Importance of MOT, Experiment Sequence
Last year Lectures/REFERENCES
Lecture 2 ( 08/01/2019):
Origin of cooling mechanisms and radiation pressure on atomic beams
Supplementary review articles given in below links
Lecture 3 ( 09/01/2019):
Relevant videos on Optical molasses (Click to see videos)
Laser cooling leads to a velocity dependent force and it is limited to Doppler limited temperature. Spatial
confinement could be added using Zeeman splitting this is called as Magneto Optical Trapping (MOT).
Introduction to MOT is given in this lecture
Lecture 4 ( 11/01/2019):
Concept of Magneto Optical Trapping (MOT) using two level model will be explained in this lecture
Lecture 5 ( 15/01/2019)
Spatial confinement of atoms achieved with the Zeeman Splitting
Polarization of light play a major role in space selective laser cooling
Sigma+ Sigma- configuration is discussed
MOT configuration is discussed
Lecture 6 (17/01/2019)
Difference between Optical Molasses and MOT discussed
Laser frequency de-tunings for MOT
Vacuum Chamber of MOT and Rb atoms inside the Science Chamber
Experimental Sequence of MOT
Lecture 7 (18/01/2019)
Mathematical formulation of Laser cooling Force
Momentum equation and derivation of scattering Force
Discussion on Semi-classical treatment on derivation of excited state population
using Time dependent Schrodinger wave equation
Lecture 8 (22/01/2019)
Scattering Force in the presence of Co-propagating and Counter Propagating beams
Mathematical derivation of Net cooling Force (Optical Molasses)
Force takes the form of a velocity dependent damped force
Lecture 9 (24/01/2019)
Forces in Magneto-optical trap
Detuning and Scattering Force for sigma + and sigma minus polarized light
Mathematical representation
Lecture 10 (25/01/2019)
Mathematical derivation of net cooling Forces in Magneto-optical trap (Continued)
Lecture 11 (29/01/2019)
Mathematical derivation of net cooling Forces in Magneto-optical trap
Net force takes the form of a Damped Harmonic Oscillator
Heating and Cooling rates in MOT
Derivation of Doppler limit Temperature achieved in MOT
Limitations of MOT
Relevant Materials
Lecture 12 (07/02/2019)
Lecture 13 (08/02/2019)
Lecture 14 (12/02/2019)
Role of Repumping Laser light in Multi-level atoms
Lecture 15 (14/02/2019)
Lecture 16 (15/02/2019)
A conservative potential for laser cooled atoms
Lecture 17 (19/02/2019)
Quiz I
Lecture 18 (05/03/2019)
Magnetic Trap Loading and Concept of Evaporative Cooling
Radio frequency based Evaporative cooling
