Metrological-grade tunable coherent source in the mid-infrared for molecular precision spectroscopy
Authors: Borri S., Insero G., Calonico D., Cancio Pastor P., Clivati C., D\’Ambrosio D., Schunemann P.G., Zondy J.-J., Inguscio M., Levi F., de Natale P., Santambrogio G.
Autors Affiliation: CNR, INO-Istituto Nazionale di Ottica, Largo E. Fermi 6, Firenze, FI, 50125, Italy; CNR, INO, Largo E. Fermi 6, Firenze, FI, 50125, Italy; LENS, via Carrara 1, Sesto Fiorentino, FI, 50019, Italy; INRIM Istituto Nazionale di Ricerca Metrologica, Torino, I-10135, Italy; BAE Systems, Inc, MER15-1813, P.O. Box 868, Nashua, NH 03061-0868, United States; Nazarbaev University, School of Science and Technology, Physics Department, Kabanbay Batyr 53, Astana, 010000, Kazakhstan
Abstract: Molecular precision spectroscopy opens new perspectives on tests of fundamental laws of physics and of fundamental constants variation . The mid infrared (IR) is a key region for molecular spectroscopy, and the efforts towards the development of versatile, spectrally pure, and tunable coherent sources in this region have been constantly growing in the last decade. A convenient way to generate a mid-IR tunable source for precision spectroscopy is difference-frequency generation (DFG) in a nonlinear crystal starting from two visible or near-infrared sources. Cs-traceability can be achieved by locking the pump and signal lasers to an optical frequency comb referenced to the primary frequency standard. © 2017 IEEE