International Day of Light (16 May 2018)


3.00 to 3.15 pm

Introduction to the event 

3.15 to 4.00 pm

Ultra-precise Atomic Clocks

Seminar by
Dr. Amitava Sen Gupta
Formerly at CSIR-National Physical Laboratory,
Dr K S Krishnan Marg, New Delhi


In this talk we shall mainly discuss the basic principles of operation of an atomic clock. The basis of an atomic clock is an atomic resonance which is a truly fundamental and invariant quantity. In the practical implementation, a quartz oscillator is phase locked to the atomic resonance to give a usable output. We shall discuss the use of light sources - especially in the form of lasers, to improve the design of the clocks so that they are made (a) more accurate or (b) more compact and robust. We shall discuss recent developments in this field that have resulted in clocks that would lose or gain 1 sec in about 3 million years.

4.00 to 4.10 pm

Releasing of booklet by the Chief Guest Dr. Amitava Sen Gupta

4.10 to 4.45 pm

Tea Break

4.45 to 6.30 pm

Research Scholar Day Event