Title:    Optical Frequency Combs 

Friday, 28th  May 2021 at 4.00 pm through MICROSOFT TEAMS 

Microsoft Teams Link:


The precise measurement of time and frequency can lead to a wide range of applications, including GPS navigation systems, telecommunications, tests of fundamental physics, astrophysics, etc. Increased timing precision requires oscillators with higher frequency and phase stability. However, counting higher optical frequencies (several hundreds of terahertz)had been a formidable task until the development of optical frequency combs. The development of optical frequency combs has revolutionalizedprecision measurements such as in high-throughput high resolution optical spectroscopy.

In my seminar, I will first introduce the concepts and development of frequency combs. Then I will briefly discuss the application of optical frequency combs in the world’s most precise clock (optical atomic clock) and molecular spectroscopy. I will conclude with discussing how recent strides in high-resolution frequency comb technology have overcome several  limitations of the current state-of-art spectroscopic techniques.


  1. David J. Jones, Scott A. Diddams, Jinendra K. Ranka, Andrew Stentz, Robert S. Windeler, John L. Hall and Steven T. Cundiff “Carrier-Envelope Phase Control of Femtosecond Mode-Locked Lasers and Direct Optical Frequency Synthesis” , Science 288 (5466), 635-639. DOI: 10.1126/science.288.5466.635
  2. NIST-F1 Cesium Fountain Atomic Clock | NIST 
  3. JILA Strontium Atomic Clock Sets New Records in Both Precision and Stability | NIST 
  4. Bachana Lomsadze, “Frequency comb based multidimensional coherent spectroscopy bridges the gap between fundamental science and cutting edge technology”, The journal of Chemical Physics 154,160901 (2021)
  5. Ian Coddington, William C. Swann, and Nathan R. Newbury, “Coherent Multiheterodyne Spectroscopy Using Stabilized Optical Frequency Combs” ,Phys. Rev. Lett. 101, 049901 (2008)