GaAs-chip-based mid-infrared supercontinuum generation  

作　　者：Geoffroy Granger Myriam Bailly Hugo Delahaye Cristian Jimenez Idris Tiliouine Yann Leventoux Jean-Christophe Orlianges Vincent Couderc Bruno Gérard Rezki Becheker Said Idlahcen Thomas Godin Ammar Hideur Arnaud Grisard Eric Lallier Sébastien Février 

机构地区：[1]Universitéde Limoges XLIM UMR CNRS 7252,123 Av.A.Thomas,87060 Limoges,France [2]Thales Research&Technology,1 Av.Augustin Fresnel,91767 Palaiseau Cedex,France [3]III-V Lab,1 Av.Augustin Fresnel,91767 Palaiseau Cedex,France [4]CORIA(UMR 6614),CNRS-INSA Rouen-Universitéde Rouen Normandie,Normandie Université,Saint-Etienne du Rouvray,France

出　　处：《Light(Science & Applications)》2023年第11期2443-2450,共8页光（科学与应用)（英文版）

基　　金：We acknowledge the financial support from Agence Nationale de la Recherche(ANR-16-CE08-0031 BISCOT,ANR-20-CE42-0003 FLEX-UV,ANR-21-CE24-0001 MIRthFUL);H2020 Future and Emerging Technologies(PETACom 829153);Conseil Régional de Nouvelle-Aquitaine(SIP2,Femto-VO2,MIR-X).

摘　　要：The mid-infrared spectral region opens up new possibilities for applications such as molecular spectroscopy with high spatial and frequency resolution.For example,the mid-infrared light provided by synchrotron sources has helped for early diagnosis of several pathologies.However,alternative light sources at the table-top scale would enable better access to these state-of-the-art characterizations,eventually speeding up research in biology and medicine.Midinfrared supercontinuum generation in highly nonlinear waveguides pumped by compact fiber lasers represents an appealing alternative to synchrotrons.Here,we introduce orientation-patterned gallium arsenide waveguides as a new versatile platform for mid-infrared supercontinuum generation.Waveguides and fiber-based pump lasers are optimized in tandem to allow for the group velocities of the signal and the idler waves to match near the degeneracy point.This configuration exacerbates supercontinuum generation from 4 to 9μm when waveguides are pumped at 2750 nm with few-nanojoule energy pulses.The brightness of the novel mid-infrared source exceeds that of the thirdgeneration synchrotron source by a factor of 20.We also show that the nonlinear dynamics is strongly influenced by the choice of waveguide and laser parameters,thus offering an additional degree of freedom in tailoring the spectral profile of the generated light.Such an approach then opens new paths for high-brightness mid-infrared laser sources development for high-resolution spectroscopy and imaging.Furthermore,thanks to the excellent mechanical and thermal properties of the waveguide material,further power scaling seems feasible,allowing for the generation of watt-level ultra-broad frequency combs in the mid-infrared.

关 键 词：waveguide PUMPED PUMP 

分 类 号：TN24[电子电信—物理电子学]