DFG-based mid-IR tunable source with 0.5 mJ energy and a 30 pm linewidth
Authors: Stoychev LI., Cabrera H., Suarez-Vargas JJ., Baruzzo M., Gadedjisso-Tossou KS., Nikolov IP., Sigalotti P., Demidovich AA., Mocchiutti E., Pizzolotto C., Niemela J., Toci G., Danailov MB., Vacchi A.
Autors Affiliation: Ist Nazl Fis Nucl, Sez Trieste, Via Valerio 2, I-34149 Trieste, Italy; Bulgarian Acad Sci, Inst Solid State Phys, 72 Tzarigradsko Chaussee, Sofia 1784, Bulgaria; Abdus Salam Int Ctr Theoret Phys, Opt Lab, Str Costiera 11, I-34151 Trieste, Italy; Udine Univ, Math & Informat Dept, Via Palladio 8, I-33100 Udine, Italy; Univ Lome, Dept Phys, 01 BP 1515, Lome, Togo; Elettra Sincrotrone, SCPA, SS14 Km 163-5, I-34149 Trieste, Italy; CNR, Ist Nazl Ott, CNR INO, Via Madonna Piano 10, I-50019 Sesto Fiorentino, Italy
Abstract: We report on a laser system based on difference frequency generation (DFG) to produce tunable, narrow-linewidth (<30 pm), and comparatively high-energy mid-IR radiation in the 6.8 mu m region. The system exploits a lithium thioin-date (LiInS2) nonlinear crystal and nanosecond pulses generated by single-frequency Nd:YAG and Cr:forsterite lasers at 1064 and 1262 nm, respectively. Two experimental configurations are used: in the first one, single-pass, the mid-IR energy achieved is 205 mu J. Additional increments, up to 540 mu J, are obtained by performing double-pass through the nonlinear crystal. This laser has been developed for high-resolution photon-hungry spectroscopy in the mid-IR. (C) 2020 Optical Society of America Journal/Review: OPTICS LETTERS
Volume: 45 (19) Pages from: 5526 to: 5529