Mid-infrared microcavity lasers have important applications in biosensing,mid-infrared spectroscopy,and environmental monitoring.However,the low output power of existing mid-infrared microcavity lasers hinders their p...Mid-infrared microcavity lasers have important applications in biosensing,mid-infrared spectroscopy,and environmental monitoring.However,the low output power of existing mid-infrared microcavity lasers hinders their practical use.This drawback is attributed to the insufficient laser gain medium,which limits the development of mid-infrared whispering-gallerymode(WGM)lasers.To address this issue,we have employed ion implantation-enhanced etching to fabricate Tm:YAG thin films as effective gain media for mid-infrared WGM lasers.The Tm:YAG thin film,with a thickness of 2μm,exhibits excellent fluorescence characteristics.Subsequently,the Tm:YAG thin film is processed using focused ion beam to form microdisks with a diameter of 30μm.Under 785 nm laser pumping,the maximum output power of the Tm:YAG microdisk at 2023.1 nm is229μW,with a slope efficiency of 2.9%.This work demonstrates the outstanding potential of Tm:YAG as a mid-infrared laser gain medium,providing a new option for the development of mid-infrared lasers.展开更多
Whispering-gallery-mode microcavity lasers possess remarkable characteristics such as high Q factors and compact geometries,making them an essential element in the evolution of microlasers.However,solid-state whisperi...Whispering-gallery-mode microcavity lasers possess remarkable characteristics such as high Q factors and compact geometries,making them an essential element in the evolution of microlasers.However,solid-state whispering-gallery-mode lasers have previously suffered from low output power and limited optical conversion efficiency,hindering their applications.Here,we present the achievement of milliwatt laser emissions at a wavelength of 1.06µm from a solid-state whispering-gallery-mode laser.To accomplish this,we construct a whispering-gallery-mode microcavity(with a diameter of 30µm)using a crystalline Nd:YAG thin film obtained through carbon-implantation enhanced etching of a Nd:YAG crystal.This microcavity laser demonstrates a maximum output power of 1.12 mW and an optical conversion efficiency of 12.4%.Moreover,our unique eccentric microcavity design enables efficient coupling of free-space pump light,facilitating integration with a waveguide.This integration allowed for single-wavelength laser emission from the waveguide,achieving an output power of 0.5 mW and an optical conversion efficiency of 6.18%.Our work opens up new possibilities for advancing solid-state whispering-gallery-mode lasers,providing a viable option for compact photonic sources.展开更多
基金supported by the National Natural Science Foundation of China(Grant No.12122508)supported by State Key Laboratory of Nuclear Physics and Technology,Peking University(Grant No.NPT2023KFJ11)。
文摘Mid-infrared microcavity lasers have important applications in biosensing,mid-infrared spectroscopy,and environmental monitoring.However,the low output power of existing mid-infrared microcavity lasers hinders their practical use.This drawback is attributed to the insufficient laser gain medium,which limits the development of mid-infrared whispering-gallerymode(WGM)lasers.To address this issue,we have employed ion implantation-enhanced etching to fabricate Tm:YAG thin films as effective gain media for mid-infrared WGM lasers.The Tm:YAG thin film,with a thickness of 2μm,exhibits excellent fluorescence characteristics.Subsequently,the Tm:YAG thin film is processed using focused ion beam to form microdisks with a diameter of 30μm.Under 785 nm laser pumping,the maximum output power of the Tm:YAG microdisk at 2023.1 nm is229μW,with a slope efficiency of 2.9%.This work demonstrates the outstanding potential of Tm:YAG as a mid-infrared laser gain medium,providing a new option for the development of mid-infrared lasers.
基金supported by the National Natural Science Foundation of China(No.12122508).
文摘Whispering-gallery-mode microcavity lasers possess remarkable characteristics such as high Q factors and compact geometries,making them an essential element in the evolution of microlasers.However,solid-state whispering-gallery-mode lasers have previously suffered from low output power and limited optical conversion efficiency,hindering their applications.Here,we present the achievement of milliwatt laser emissions at a wavelength of 1.06µm from a solid-state whispering-gallery-mode laser.To accomplish this,we construct a whispering-gallery-mode microcavity(with a diameter of 30µm)using a crystalline Nd:YAG thin film obtained through carbon-implantation enhanced etching of a Nd:YAG crystal.This microcavity laser demonstrates a maximum output power of 1.12 mW and an optical conversion efficiency of 12.4%.Moreover,our unique eccentric microcavity design enables efficient coupling of free-space pump light,facilitating integration with a waveguide.This integration allowed for single-wavelength laser emission from the waveguide,achieving an output power of 0.5 mW and an optical conversion efficiency of 6.18%.Our work opens up new possibilities for advancing solid-state whispering-gallery-mode lasers,providing a viable option for compact photonic sources.
