Nd:Sr<sub>5</sub>（VO<sub>4</sub>）<sub>3</sub>F （Nd:SVAP） is a new type of laser crystal reported in recent years. L. George declared the growth of Nd:SVAP crystal for the first ...Nd:Sr<sub>5</sub>（VO<sub>4</sub>）<sub>3</sub>F （Nd:SVAP） is a new type of laser crystal reported in recent years. L. George declared the growth of Nd:SVAP crystal for the first time at MRS fall meeting in 1993. Soon after, the laser performance of Nd:SVAP pumped by a Ti:sapphire laser was reported. With the advantages of low pumping threshold and high conversion efficiency,Nd:SVAP is suitable for compact solid-state lasers pumped by laser diodes （LD） and has wide prospects in application. In this letter, we report the experimental results of an LD-pumped Nd:SVAP laser for the first time.展开更多
The 3μm laser emission of Er 3+ ( 4 I 11/2 → 4 I 13/2 )in the YAG crystal is,in principle,selfsaturation transition,the lifetime of the upper laser level( 4 I 11/2 )being smaller than that of the olwer one( 4 I 13/2...The 3μm laser emission of Er 3+ ( 4 I 11/2 → 4 I 13/2 )in the YAG crystal is,in principle,selfsaturation transition,the lifetime of the upper laser level( 4 I 11/2 )being smaller than that of the olwer one( 4 I 13/2 ).The effect of the selfsaturation limit the laser output. In present work,for the first time,we report on the investigation of the utility of Pr 3+ as a sensitizer of Er 3+ ion,using Pr 3+ 4 f 2-4 f5d transition.The radiation emission from 4f5d configuration of Pr 3+ ion have been observed in the YAG∶Pr 3+ crystal.This shows that under suitable conditions this radiant process can compete successfully by non radiative decay to the 4 f configuration.Using Er 3+ Pr 3 codoped YAG it is possible to predict the position of the lowest 4 f 2-4 f5d absorption bands of Pr 3+ ion in the ultraviolet range and to present the occurrence of the energy transfer from Pr 3+ to Er 3+ ion.By xenon flash lamp pumped 2.93μm laser action in the YAG∶(Er 3+ ,Pr 3+ ) crystals was demonstrated at room temperature.展开更多
After 40 years of development,laser crystals have established a firm foundation for solid state laser technology.The improvements of the crystals now on hand and the exploration of new crystals are still going on acti...After 40 years of development,laser crystals have established a firm foundation for solid state laser technology.The improvements of the crystals now on hand and the exploration of new crystals are still going on actively. 1 Development of the laser crystals now on hand 1.1 YAG YAG is a laser crystal with good property,extensive application and wide scale manufacturing.Aimed at the need of LD pumping,many new varieties of garnet have been developed,with the goal of enlarging the absorption of line width.The idea of this development is chiefly as the follows:(1)Enlarge the lattice constant through substitution of cations;(2)Waiden the absorption spectrum through the vacancy of cations;(3)Using cations with host sensitization,such as Mn 2+ ,etc.The author has considered several optional varieties:Y 2.7 La 0.25 Nd 0.05 Al 3.5 Nb 0.9 O 12 (calculating lattice constant: a 0～1.202nm,in contrast of that of YAG: a 0～1.200nm);Y 1.5 LaMn 2+ 0.5 Al 4.5 Si 0.5 O 12 ( a 0～1.205nm);and YLaMn 2+ Al 4(Nb,V) 5+ 0.6 O 12 ( a 0～1.204nm);etc.展开更多
基金Project supported by the National Natural Science Foundation of China.
文摘Nd:Sr<sub>5</sub>（VO<sub>4</sub>）<sub>3</sub>F （Nd:SVAP） is a new type of laser crystal reported in recent years. L. George declared the growth of Nd:SVAP crystal for the first time at MRS fall meeting in 1993. Soon after, the laser performance of Nd:SVAP pumped by a Ti:sapphire laser was reported. With the advantages of low pumping threshold and high conversion efficiency,Nd:SVAP is suitable for compact solid-state lasers pumped by laser diodes （LD） and has wide prospects in application. In this letter, we report the experimental results of an LD-pumped Nd:SVAP laser for the first time.
文摘The 3μm laser emission of Er 3+ ( 4 I 11/2 → 4 I 13/2 )in the YAG crystal is,in principle,selfsaturation transition,the lifetime of the upper laser level( 4 I 11/2 )being smaller than that of the olwer one( 4 I 13/2 ).The effect of the selfsaturation limit the laser output. In present work,for the first time,we report on the investigation of the utility of Pr 3+ as a sensitizer of Er 3+ ion,using Pr 3+ 4 f 2-4 f5d transition.The radiation emission from 4f5d configuration of Pr 3+ ion have been observed in the YAG∶Pr 3+ crystal.This shows that under suitable conditions this radiant process can compete successfully by non radiative decay to the 4 f configuration.Using Er 3+ Pr 3 codoped YAG it is possible to predict the position of the lowest 4 f 2-4 f5d absorption bands of Pr 3+ ion in the ultraviolet range and to present the occurrence of the energy transfer from Pr 3+ to Er 3+ ion.By xenon flash lamp pumped 2.93μm laser action in the YAG∶(Er 3+ ,Pr 3+ ) crystals was demonstrated at room temperature.
文摘After 40 years of development,laser crystals have established a firm foundation for solid state laser technology.The improvements of the crystals now on hand and the exploration of new crystals are still going on actively. 1 Development of the laser crystals now on hand 1.1 YAG YAG is a laser crystal with good property,extensive application and wide scale manufacturing.Aimed at the need of LD pumping,many new varieties of garnet have been developed,with the goal of enlarging the absorption of line width.The idea of this development is chiefly as the follows:(1)Enlarge the lattice constant through substitution of cations;(2)Waiden the absorption spectrum through the vacancy of cations;(3)Using cations with host sensitization,such as Mn 2+ ,etc.The author has considered several optional varieties:Y 2.7 La 0.25 Nd 0.05 Al 3.5 Nb 0.9 O 12 (calculating lattice constant: a 0～1.202nm,in contrast of that of YAG: a 0～1.200nm);Y 1.5 LaMn 2+ 0.5 Al 4.5 Si 0.5 O 12 ( a 0～1.205nm);and YLaMn 2+ Al 4(Nb,V) 5+ 0.6 O 12 ( a 0～1.204nm);etc.
