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The optimization design of photo-electric coupling mechanism of Er~(3+) doped in mid-infrared laser crystals at the wavelength of ~3 μm

Chaoyang Tu  Yan Wang  Zhenyu You  Zhaojie Zhu  Jianfu Li  Junlong Xu  
【摘要】:The mid-infrared solid lasers at the wavelength of 2.7~3μm have drawn much attention for enormous applications in medicine,detection and remote sensors etc.Er~(3+) doping in matrix can be served as an active ion to achieve 2.7~3μm lasers effectively through its ~4I_(11/2)→~4I_(13/2) transition.There were many reports about Er~(3+) as an active ion concentrate mainly on oxide hosts(crystals and ceramics) like YAG,YSGG and fluoride hosts like CaF_2,SrF_2,etc.However,the efficiencies of these lasers are low because of the scientific problems,such as the high nonradiative transition probability,self-termination effect,low absorption efficiency,multiple luminescence competing channels,etc.which result in failure in meeting the demand of practical application.In order to overcome these disadvantages,some sensitizing ions,such as Nd~(3+),Pr~(3+),Tm~(3+) were co-coped into laser crystals for optimization design of photo-electric coupling mechanism of Er~(3+) ions in our work.Some new gallates and aluminates such as Gd_3Ga_5O_(12),ABC_3O_7(A=Ca,Sr,Ba,B=Y,Gd,La,C=Al,Ga),CaReAlO_4,Re_3Sc_2Ga_5O_(12),were used as hosts of mid-infrared laser crystals and their Er~(3+) co-doped with sensitizing ions laser crystals with high quality and larger sizes were grown.Their spectra and laser properties were also investigated.The microchip laser and passively Q-switched mid-infrared(MIR) solid state lasers with Bi_2Te_3/graphene hetero-structure saturable absorber(SA) were obtained for the first time.

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