Allison Research Group

Postdoc Grzegorz has been awarded a Marie Skłodowskiej-Curie fellowship from the European Commission. Congratulations!

A press release can be found HERE. The Stony Brook CE-TAS spectrometer is in the Polish news!

While non-perturbative high harmonic generation (HHG) has been a hot topic for decades, cascaded HHG is also a very rich problem and can have much higher efficiency. In collaboration with the Diddams group at NIST, we’ve investigated frequency comb generation via cascaded HHG in PPLN waveguides.  A recently submitted paper can be found here: https://arxiv.org/abs/2102.04670

After getting all the systematics under control, we have written a paper on our broadband cavity-enhanced transient absorption spectrometer. This takes CE-TAS from a one-of demonstration to a real chemical physics tool. The paper is available on the arXiv here: https://arxiv.org/abs/2102.04981

Grzegorz Kowzan has returned to our group now as a postdoc after completing is Ph. D. in Toruń. Welcome back!

Usually, we update the group photo every Spring. Due to the COVID-19 pandemic, we now all work remotely. So our latest group photo is a screenshot of a Zoom meeting…

All are doing OK so far, with many projects to work on remotely. We remain motivated by our basic science goals, realizing that basic science, including the development of tools to image the microscopic, underlies underlies much of our modern-day scientific framework for understanding the novel coronavirus.

Group Photo 2020

Two new postdocs have joined our effort. Sergey Chernov comes from Mainz with extensive experience in ARPES and time-of-flight momentum microscopy. Alice Kunin comes from Berkeley with experience in ultrafast optics and time-resolved photoelelectron spectroscopy.

Both have hit the ground running.

One of the Allison lab core competencies has been resonantly enhancing frequency combs in high-finesse optical cavities. In a paper posted to the arXiv here, we have extended this technology to a widely tunable platform for the first time. This enables broadband cavity-enhanced ultrafast spectroscopy, among other applications.

We posted a new paper about our high-power mid-IR comb development.

Neomi Lewis completed a summer research program at the Max Planck Institute for Quantum Optics in Garching, Germany. Now she’s back in the Allison lab.

Ryan Hou, an undergraduate from Columbia University, completed summer research in the Allison group, working on Cavity-Enhanced Ultrafast Spectroscopy