Numerical design of an efficient Ho^(3+)-doped InF3 fiber laser at~3.2μm  

作　　者：Shi-Yuan Zhou Hong-Yu Luo Ya-Zhou Wang Yong Liu 

机构地区：[1]State Key Laboratory of Electronic Thin Films and Integrated Devices,School of Optoelectronic Science and Engineering,University of Electronic Science and Technology of China,Chengdu,611731,China [2]DTU Electro,Technical University of Denmark,Kongens Lyngby,2800,Denmark

出　　处：《Journal of Electronic Science and Technology》2024年第3期35-46,共12页电子科技学刊（英文版）

基　　金：supported in parts by the National Natural Science Foundation of China under Grants No.62005040 and No.U20A20210.

摘　　要：In this work,we theoretically unlock the potential of Ho^(3+)-doped InF3 fiber for efficient~3.2μm laser generation(from the ^(5)F_(4),^(5)S_(2)→^(5)F_(5) transition),by employing a novel dual-wavelength pumping scheme at 1150 nm and 980 nm,for the first time.Under clad-coupled 1150 nm pumping of 5 W,~3.2μm power of 3.6 W has been predicted with the optical-to-optical efficiency of 14.4%.Further efficient power scaling,however,is blocked by the output saturation with 980 nm pumping.To alleviate this behavior,the cascaded ^(5)I_(5)→^(5)I_(6) transition,targeting~3.9μm,has been activated simultaneously,therefore accelerating the population circulation between the laser upper level ^(5)F_(4),^(5)S_(2) and long-lived ^(5)I_(6) level under 980 nm pumping.As a result,enhanced~3.2μm power of 4.68 W has been obtained with optical-to-optical efficiency of 15.6%.Meanwhile the~3.9μm laser,yielding power of 2.76 W with optical-to-optical efficiency of 9.2%,is theoretically achievable as well with a moderate heat load,of which the performance is even better than the prior experimentally and theoretically reported Ho^(3+)-doped InF3 fiber lasers emitting at~3.9μm alone.This work demonstrates a versatile platform for laser generation at~3.2μm and~3.9μm,thus providing the new opportunities for many potential applications,e.g.,polymer processing,infrared countermeasures,and free-space communications.

关 键 词：Cascaded Fiber laser HOLMIUM MID-INFRARED 

分 类 号：TN248[电子电信—物理电子学]