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Physicists at the University of Oldenburg have created three-dimensional light fields by superimposing two ultrashort laser pulses that converge from different directions. This technique allows them to excite electrons into quantum states that were previously impossible to reach in experiments. Dr. Matthias Wollenhaupt, who leads the research team, explains that their method generates electronic quantum states that existed only in theory and makes them spatially visible.

The process involves combining two laser beams of different colors to form femtosecond pulses, which are extremely short bursts lasting just a few millionths of a billionth of a second. These intersect at a single point to create light fields that oscillate in all three spatial directions. Darius Köhnke, a Ph.D. student and lead author, notes this capability acts like an ultrahigh-speed camera, capturing the successive stages of electron states to form a movie of their evolution.

The team demonstrated this by selectively exciting electrons in potassium atoms into higher-energy states before releasing them. They observed these changes at short intervals, proving the method’s precision. Dr. Olga Smirnova of the Max Born Institute for Nonlinear Optics recently highlighted similar possibilities for investigating molecular chirality in her article published in *Science*.

This research is particularly promising for studying chiral molecules, which exist as mirror images that cannot be superimposed, much like left and right hands. Many biomolecules, including amino acids and certain medicines, are chiral, and their different forms often have distinct properties. For instance, one form of the drug thalidomide causes birth defects while another is harmless, yet they are difficult to separate. The researchers suggest that three-dimensional light fields could lead to important advances in chiral sensing by possessing their own chiral properties.