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December 2023: We are very grateful to have received a W. M. Keck Foundation grant in collaboration with Prof. Chris Greene. This grant will support the development and use of attosecond entangled photons in attosecond spectroscopy. More information in this article.

October 19, 2023: Niranjan gave the Department of Physics and Astronomy's annual Nobel lecture on Attosecond Science.

October 2023: We are very excited that the 2023 Nobel Prize in Physics was awarded to three physicists for their work in attosecond science. Niranjan wrote a popular science article on attosecond science in The Conversation which can be found here

August 2023: We are very grateful to have received funding from the U.S. Department of Energy's Atomic, Molecular and Optical Sciences (AMOS) program to study ultrafast non-adiabatic dynamics in molecules with electric field-resolved nonlinear spectroscopy.

August 2023: Graduate students Russell Zimmerman, George Economou and undergraduate students Nisha Johnson, Stephen Reeves, Jacob Larsen join the group. Welcome!

December 2022: 2022 was a good year for the group. We published two papers, received our first grant from NSF, welcomed two new graduate students to the group, made progress on two experiments, established new collaborations and much more. Here are few recent lab photos:

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September 27, 2022: The news article on our attosecond entangled photons paper appears on the Department of Energy (DOE), Office of Science news webpage. The DOE link is here (see post on September 27, 2022): https://www.energy.gov/science/listings/university-and-stakeholder-news?page=0. The original news article on our work written by our Communications Specialist Cheryl Pierce is here: https://www.physics.purdue.edu/news/2022/0907_shivaram_atto.html

September 26, 2022: Our paper on electric field measurement of femtosecond nonlinear optical signals from gas-phase molecules is now published in Optics Express. It has also been chosen as Editor's Pickhttps://doi.org/10.1364/OE.470925  

September 12, 2022: Welcome new graduate student Eric Liu!

September 6, 2022: Our paper on attosecond entangled photons is now published in Physical Review Research: https://doi.org/10.1103/PhysRevResearch.4.L032038

August 2022: We have several new members joining the group. Welcome graduate student Yuyan Zhong and undergraduate students Austin Beasley, Keeran Abraham, Mary Vaughan, Chandler Albright and Kheng Kit Chong!

July 20, 2022: A manuscript on our experimental work demonstrating electric field measurement of femtosecond nonlinear optical signals from gas phase molecules has been submitted. ArXiv e-print available here: https://arxiv.org/abs/2207.06643 

June 2022: We are very grateful to have received funding from NSF to study ultrafast charge dynamics in molecular ions using electric field-resolved nonlinear optical spectroscopy.

June 2022: A manuscript on our theoretical work in collaboration with Prof. Chris Greene's group at Purdue on Attosecond Entangled Photons has been submitted. ArXiv e-print available here: https://arxiv.org/abs/2205.14861.

June 2022: We attended the DAMOP 2022 conference in Orlando, Florida in-person. We all enjoyed the conference very much. Frank and Sidd gave very nice talks!

May 2022: Our proposal to the Molecular Foundry at Lawrence Berkeley National Laboratory was accepted. The Molecular Foundry will provide theoretical support to model our nonlinear optical experiments measuring the nonlinear signal electric field emitted from gas-phase molecules. The Molecular Foundry is a Department of Energy user facility.

April 2022: Graduate student Francis (Frank) Walz wins the Department of Physics and Astronomy's Dr. Warner Black Award for Practical Accomplishments in Physics. Congratulations Frank!

March 2022: Undergraduate students Japneet Mavi and William Alford join the group. Welcome Japneet and William!

January 2022: Undergraduate students Ivan Yang and Bilal Salha join the group. Welcome Ivan and Bilal!

November 2021: We are now part of the Midwest Quantum Collaboratory. More information here: https://www.midwestquantum.org/

August 2021: Graduate student Ravishankar (Ravi) Chatta Subramaniam joins the group to work on an Independent Study project. Welcome Ravi!

June 2021: Undergraduate student Chloe Mayhue from Swarthmore College visits the group (virtually) for the summer and beyond to work on research as part of Purdue's Summer Research Opportunities Program (SROP). Welcome Chloe!

June 2021: We attend the DAMOP 2021 virtual conference. Sidd gives a talk on nonlinear optical spectroscopy of aligned molecules and Frank presents a poster on measuring the nonlinear optical signal electric field. 

April 28, 2021: Niranjan gives a virtual colloquium talk in the Physics Department at the City College of New York, City University of New York.

April 28, 2021: Graduate student Siddhant (Sidd) Pandey wins the Department of Physics and Astronomy's Dr. Warner Black Award for Practical Accomplishments in Physics. Congratulations Sidd!

April 8, 2021: Our collaborative paper with Prof. Tongcang Li's group on femtosecond laser writing of spin defects in hexagonal boron nitride has been published in ACS Photonics: https://pubs.acs.org/doi/10.1021/acsphotonics.0c01847

Feb 25, 2021: Niranjan virtually visits the Department of Physics at Indiana University Purdue University Indianapolis (IUPUI) to give a virtual colloquium talk.

Spring 2021: First year undergraduate student Venkata (Nachi) Yellapragada and graduate student Varadharajan (Rajan) Muruganandam join the group. Welcome Nachi and Rajan!

December 2020: Our collaborative paper on femtosecond laser writing of spin defects in hexagonal boron nitride with Prof. Tongcang Li's group has been submitted for publication. arXiv:2012.03207 [quant-ph]

Fall 2020: First year undergraduate student Taylor Baker joins the group. Welcome Taylor!

May 26, 2020: The group virtually welcomes REU student Natalie Larremore from Troy University who will be working on her REU project remotely.

May 12, 2020: Graduate student Frank Walz wins the department's Gabriele F. Giuliani Award for excellence in teaching. Congratulations Frank!!

April 15, 2020: Prof. Tongcang Li (PI) and Niranjan (co-PI) awarded a seed grant by the Purdue Quantum Science and Engineering Institute (PQSEI). Thank you PQSEI!

March 8, 2020: Niranjan's paper on studying Ultrafast dynamics in Nitrobenzene molecules using Ultrafast Transient Polarization Spectroscopy published in Journal of Physical Chemistry A.

Feb 24, 2020: Niranjan visits the Department of Physics at Western Michigan University, Kalamazoo to give a colloquium talk.

Jan 31, 2020: Our laser system has been installed and ready for use in experiments. Design and construction of the experimental set up are going ahead full speed.

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Jan 2020: The group in Spring 2020. From font left - Niranjan Shivaram, Francis Walz, Maaz Ahmed. From back left - Charles Robertson, Joseph McGuire, Siddhant Pandey and Cody Cripe.

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Jan 2020: Graduate student Charles Robertson joins the group to do an Independent Study.

Dec 17, 2019: Our optical tables have been set up and ready for laser installation.

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November 2019: Renovation of the lab space for our Ultrafast Quantum Dynamics Laboratory is complete and ready for move-in.

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October 2019: Our ultrafast laser system from Coherent Inc has arrived!

September 12, 2019: Niranjan gives a colloquium talk at the Department of Physics and Astronomy, Purdue University.

September 2019: Undergraduate students Maaz Ahmed, Joseph McGuire and Cody Cripe join the group.

August 2019: Niranjan is a collaborator on a recently accepted proposal submitted to the Molecular Foundry at Lawrence Berkeley National Laboratory. The Molecular Foundry will provide theoretical support to study ultrafast dynamics of molecules by measuring non-linear response of excited states. The Molecular Foundry is a Department of Energy user facility.

August 2019: Niranjan has moved to Purdue. Fall semester started. Lab renovation is underway. Graduate students Siddhant Pandey and Francis Walz join the group.