Single-mode quasi PT-symmetric laser with high power emission  

作　　者：Enes Seker Babak Olyaeefaro Khalil Dadashi Serdar Sengu Mohammad Hosain Teimourpour Ramy El-Ganainy Abdullah Demir 

机构地区：[1]UNAM-Institute of Materials Science and Nanotechnology,Bilkent University,Ankara 06800,Turkey [2]Department of Physics,Michigan Technological University,Houghton,MI 49931,USA [3]Henes Center for Quantum Phenomena,Michigan Technological University,Houghton,MI 49931,USA

出　　处：《Light(Science & Applications)》2023年第7期1346-1353,共8页光（科学与应用)（英文版）

基　　金：the support from TUBITAK(Grant No.117F361);R.E.acknowledges the support from Air Force Office of Scientific Research(AFOSR)Multidisciplinary University Research Initiative(MURI)Award on Programmable systems with non-Hermitian quantum dynamics(Award No.FA9550-21-1-0202),NSF(Grant No.ECCS 1807552);the Alexander von Humboldt Foundation.

摘　　要：Large-area lasers are practical for generating high output powers.However,this often comes at the expense of lower beam quality due to the introduction of higher-order modes.Here,we experimentally demonstrate a new type of electrically pumped,large-area edge-emitting lasers that exhibit a high power emission(~0.4 W)and a high-quality beam(M^(2)~1.25).These favorable operational characteristics are enabled by establishing a quasi PT-symmetry between the second-order mode of a large area two-mode laser cavity and that of a single-mode auxiliary partner cavity,i.e.,by implementing a partial isospectrality between the two coupled cavities.This in turn enlarges the effective volume of the higher-order modes.As a result,a selective pump applied via current injection into the main laser cavity can provide a stronger modal gain to the fundamental mode,and thus lead to lasing in the single mode regime after filtering out higher order transverse modes.The reported experimental results confirm this intuitive picture and are in good agreement with both theoretical and numerical analysis.Above all,the employed material platform and fabrication process are compatible with the industrial standards of semiconductor lasers.This work provides the frst clear demonstration,beyond previous proof-of-concept studies,of the utility of PT-symmetry in building laser geometries with enhanced performance and,at the same time,useful output power levels and emission Cndidclerisuics.

关 键 词：power PUMPED PUMP 

分 类 号：TN248[电子电信—物理电子学]