I am happy to share our new paper, which presents the results of the last measurements I conducted at NIST.
Chirped electro-optic (EO) frequency combs are a powerful tool for fast, high-resolution spectroscopy. With up to one million coherent comb teeth spaced by only 1 kHz, they can resolve extremely fine atomic spectral features.
In this work, we show that atoms can be more than just a spectroscopy target for these combs-we can also use their optical nonlinearity to spectrally translate the comb to new wavelength regions.
Specifically, we use four-wave mixing (4WM) in rubidium vapor to coherently transfer an EO comb from 780 nm to 420 nm, preserving its comb structure and coherence in the process.
This concept can potentially be extended to other 4WM processes in Rb, opening routes toward frequency-comb generation in spectral regions where high-quality lasers and modulators are difficult to obtain, as well as more advanced applications such as squeezed frequency combs.
I would again like to thank Kartik Srinivasan for his support, David Long for introducing me to these amazing combs and for a great collaboration, and Ashish Chanana for helping me execute this experiment in record time.
It was a great way to conclude my experimental work at NIST!
https://lnkd.in/gNYQVxf6