1. European Laboratory for Non‐Linear Spectroscopy (LENS) via Nello Carrara, 1 Sesto Fiorentino 50019 Italy
2. Department of Chemistry “Ugo Schiff” University of Florence via della Lastruccia, 3–13 Sesto Fiorentino 50019 Italy
3. Institute of Bioeconomy (CNR‐IBE) National Research Council (CNR) via Madonna del Piano 10 Sesto Fiorentino 50019 Italy
4. Physics and Astronomy Department University of Florence via G. Sansone 1 Sesto Fiorentino 50019 Italy
5. Istituto Nazionale di Ricerca Metrologica (INRiM) strada delle cacce 91 Torino 10135 Italy