Pasquale Maddaloni is a research scientist at the National Institute for Optics (INO) of the National Research Council (CNR) in Naples. His research focuses on nonlinear optics and precision spectroscopy assisted by optical frequency comb synthesizers as well as cold stable molecules. He earned a Ph.D. in physics from the University of Padua.

Marco Bellini is a senior researcher at the National Institute for Optics (INO) of the National Research Council (CNR) in Florence. His research deals with ultrashort and ultraintense laser pulses to produce highly nonlinear interactions with matter, the production and applications of high-order laser harmonics, and the development of new tools in quantum optics. He earned a Ph.D. in physics from the University of Florence.

Paolo De Natale is a staff scientist and director of the National Institute for Optics (INO) of the National Research Council (CNR) in Florence. He is a SPIE fellow, is the author of 200 papers, and holds five patents. His research activities focus on atomic, molecular, and optical physics, including novel optoelectronic devices, sub-Doppler molecular spectroscopy, optical frequency comb synthesizers, quantum cascade lasers, fiber-based optical sensors, and molecular gas sensing.

Shedding Light on the Art of Timekeeping. Characterization and Control of Harmonic Oscillators. Passive Resonators. Continuous-Wave Coherent Radiation Sources. High-Resolution Spectroscopic Frequency Measurements. Time and Frequency Measurements with Pulsed Laser Systems. Frequency Standards. Future Trends in Fundamental Physics and Applications. Bibliography.