Giant enhancement of nonlinear harmonics of an optical‑tweezer phonon laser  

作　　者：Guangzong Xiao Tengfang Kuang Yutong He Xinlin Chen Wei Xiong Xiang Han Zhongqi Tan Hui Luo Hui Jing 

机构地区：[1]College of Advanced Interdisciplinary Studies,National University of Defense Technology,Changsha 410073,Hunan,China [2]Department of Physics and Synergetic Innovation Center for Quantum Effects and Applications,Hunan Normal University,Changsha 410081,Hunan,China [3]Nanhu Laser Laboratory,National University of Defense Technology,Changsha 410073,Hunan,China

出　　处：《eLight》2024年第1期90-98,共9页e光学(英文)

基　　金：supported by Fund for Distinguished Young Scholars of Hunan Province(2024JJ2055);H.J.is supported by the NSFC(11935006);the Science and Technology Innovation Program of Hunan Province(Grant No.2020RC4047),National Key R&D Program of China(No.2024YFE0102400);Hunan provincial major sci-tech program(2023ZJ1010).

摘　　要：Phonon lasers,as mechanical analogues of optical lasers,are unique tools for not only fundamental studies of the emerging field of phononics but also diverse applications such as deep-ocean monitoring,force sensing,and biomedical ultrasonics.Recently,nonlinear phonon-lasing effects were observed in an opto-levitated microsphere,i.e.,the spontaneous emerging of weak signals of high-order phonon harmonics in the phonon lasing regime.However,both the strengths and the quality factors of the emerging phonon harmonics are very poor,thus severely hindering their potential applications in making and utilizing nonlinear phonon-laser devices.Here we show that,by applying a single-colour electronic injection to this levitated system,giant enhancement can be achieved for all higher-order phonon harmonics,with more than 3 orders enhanced brightness and 5 orders narrowed linewidth.Such an electronically-enhanced phonon laser is also far more stable,with frequency stability extended from a dozen of minutes to over 1 h.More importantly,higher-order phonon correlations,as an essential lasing feature,are confirmed to be enhanced by the electronic injection as well,which as far as we know,has not been reported in previous works using this technique.This work,providing much stronger and better-quality signals of coherent phonon harmonics,is a key step towards controlling and utilizing nonlinear phonon lasers for applications such as phonon frequency combs,broadband phonon sensors,and ultrasonic bio-medical diagnosis.

关 键 词：Phonon laser OPTOMECHANICS Optical tweezers 

分 类 号：TN2[电子电信—物理电子学]