CN108336639A - 一种自拉曼自倍频固体激光器 - Google Patents
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Abstract
一种自拉曼自倍频固体激光器,涉及激光晶体和器件领域。本发明以一块稀土离子掺杂的同时具有拉曼散射和二阶非线性光学特性的晶体作为增益介质,采用能被该增益介质有效吸收的发射光泵浦,便可直接实现自拉曼自倍频固体激光输出,使得固体拉曼倍频激光器更为简单紧凑。
Description
技术领域
本发明涉及激光晶体和器件领域。
背景技术
拉曼和倍频技术均是利用晶体的非线性光学效应获得不同的激光发射波长,而固体拉曼倍频激光器则是利用上述两种非线性光学技术的结合,以拓展得到更多不同波长的激光输出,满足不同领域的应用需求。一般采用以下两种方案以实现固体激光拉曼频移后的倍频激光输出:(1)首先采用半导体激光器(LD)泵浦一块稀土离子掺杂的基质晶体产生基频激光,然后利用一块拉曼晶体通过受激拉曼效应对基频激光进行频移,再利用一块非线性光学晶体倍频产生拉曼频移激光的倍频光;(2)首先采用LD泵浦一块稀土离子掺杂的具有拉曼散射特性的基质晶体直接产生自拉曼频移激光输出,再利用一块非线性光学晶体倍频产生拉曼频移激光的倍频光。然而,上述方案的缺点是至少需要用到两块晶体,激光腔结构相对复杂,调整难度较大,器件成本相对较高。
针对上述方案所存在的问题,Gao.Z.L(Opt.Express,21(2013)7821)等人仅利用一块同时具有拉曼散射和二阶非线性光学特性的BaTeMo2O9晶体,就实现了对1064nm波长激光的拉曼和倍频转换,产生了589nm的黄色激光,简化了激光腔结构并降低了器件成本。然而,BaTeMo2O9晶体无法实现稀土离子的掺杂,所需的基频激光仍需由一块Nd:YAG激光晶体产生,激光系统相对复杂。研究内容
本发明的目的在于提供一种自拉曼自倍频固体激光器,该激光器以一块稀土离子掺杂的同时具有拉曼散射和二阶非线性光学特性的晶体作为增益介质,采用能被该增益介质有效吸收的光源作为泵浦源,便可直接实现自拉曼自倍频固体激光输出。
本发明包括如下技术方案:
1.一种自拉曼自倍频固体激光器,由增益介质,激光谐振腔和泵浦系统组成,其特征在于:该激光器以一块稀土离子掺杂的同时具有拉曼散射和二阶非线性光学特性的晶体作为增益介质;激光谐振腔由输入和输出镜组成,输入镜设计为在泵浦光波长处透过率T≥80%,在基频激光、拉曼频移激光和倍频激光波长处透过率T≤0.5%,输出镜设计为在基频激光和拉曼频移激光波长处透过率T≤0.5%,倍频激光波长处透过率T≥70%;泵浦系统包括能被该增益介质有效吸收的光源以及放置在该光源和增益介质之间的光学耦合器件。
2.如项1所述激光器的晶体,其特征在于:晶体为β1-Gd2(MoO4)3,属于正交晶系,空间群为单胞参数为 α=β=γ=90°。
3.如项1所述激光器增益介质中的稀土离子,其特征在于:稀土离子及掺杂浓度分别为Er3+(5at.%~50at.%),Yb3+(0.5at.%~10at.%),Nd3+(0.5at.%~10at.%),Ho3+(0.5at.%~5at.%),Tm3+(0.5at.%~10at.%),Dy3+(0.5at.%~5at.%),Tb3+(0.5at.%~5at.%),Sm3+(0.5at.%~5at.%)。
4.一种自拉曼自倍频固体脉冲激光器,其特征在于:在项1所述激光器的增益介质和输出镜之间插入基频激光的调Q或锁模元件,实现自拉曼自倍频的脉冲激光运转。
实施本发明技术方案具有的有益效果是:以一块稀土离子掺杂的同时具有拉曼散射和二阶非线性光学特性的晶体作为增益介质,采用能被该增益介质有效吸收的发射光泵浦,便可直接实现自拉曼自倍频固体激光输出,使得固体拉曼倍频激光器更为简单紧凑。
具体实施方式
实例1:807nm半导体激光端面泵浦Nd3+:β1-Gd2(MoO4)3晶体实现590nm固体激光输出。
利用提拉法生长3.0at.%Nd3+:β1-Gd2(MoO4)3激光晶体。按照一类相位匹配,沿匹配角(θ=55°,)切割出横截面为5×5mm2,通光长度为6mm的晶体样品作为激光增益介质,端面抛光后置于激光腔中。激光腔输入镜设计为在807nm波长处透过率T=90%,在560-600nm、1030-1080nm和1120-1200nm处透过率T=0.3%;输出镜在1030-1080nm和1120-1200nm处的透过率T=0.3%,在560-600nm处透过率T=80%。采用10W的807nm半导体激光端面泵浦该增益介质,可获得连续功率高于200mW的590nm波长固体激光输出。另外,使用但不限于使用如下表格中的掺杂不同Nd3+离子浓度的β1-Gd2(MoO4)3晶体作为560-600nm波段固体激光器的增益介质,采用以上的技术方案也能实现自拉曼自倍频激光输出。
增益介质 | Nd3+浓度 |
Nd3+:β1-Gd2(MoO4)3晶体 | 0.5at.% |
Nd3+:β1-Gd2(MoO4)3晶体 | 5.0at.% |
Nd3+:β1-Gd2(MoO4)3晶体 | 8.0at.% |
Nd3+:β1-Gd2(MoO4)3晶体 | 10.0at.% |
实例2:807nm半导体激光端面泵浦Nd3+:β1-Gd2(MoO4)3晶体实现590nm固体脉冲激光输出。
直接将1030-1080nm波段的被动调Q片(如Cr4+:YAG)或声光调Q模块插入实例1中的激光增益介质和输出镜之间,采用807nm半导体激光端面泵浦该增益介质,可实现590nm波长的调Q脉冲激光运转。
实例3:795nm半导体激光端面泵浦Tm3+:β1-Gd2(MoO4)3晶体实现1162nm固体激光输出。
利用提拉法生长3.3at.%Tm3+:β1-Gd2(MoO4)3激光晶体。按照一类相位匹配,沿匹配角(θ=24.5°,)切割出横截面为5×5mm2,通光长度为7mm的晶体样品作为激光增益介质,端面抛光后置于激光腔中。激光腔输入镜设计为在795nm波长处透过率T=90%,在1125-1250nm、1850-2000nm和2250-2500nm处透过率T=0.3%;输出镜在1850-2000nm和2250-2500nm处的透过率T=0.3%,在1125-1250nm处透过率T=85%。采用10W的795nm半导体激光端面泵浦该增益介质,可获得连续功率高于300mW的1162nm波长固体激光输出。另外,使用但不限于使用如下表格中的掺杂不同Tm3+离子浓度的β1-Gd2(MoO4)3晶体作为固体拉曼倍频激光器的增益介质,采用以上的技术方案也能实现自拉曼自倍频激光输出。
增益介质 | Tm3+浓度 |
Tm3+:β1-Gd2(MoO4)3晶体 | 0.5at.% |
Tm3+:β1-Gd2(MoO4)3晶体 | 5.0at.% |
Tm3+:β1-Gd2(MoO4)3晶体 | 8.0at.% |
Tm3+:β1-Gd2(MoO4)3晶体 | 10.0at.% |
实例4:795nm半导体激光端面泵浦Tm3+:β1-Gd2(MoO4)3晶体实现1162nm固体脉冲激光输出。
直接将1850-2000nm波段的被动调Q片(如Cr2+:ZnS)或声光调Q模块插入实例3中的激光增益介质和输出镜之间,采用795nm半导体激光端面泵浦该增益介质,可实现1162nm波长的调Q脉冲激光运转。
实例5:977nm半导体激光端面泵浦Yb3+:β1-Gd2(MoO4)3晶体实现574nm固体激光输出。
利用提拉法生长1.0at.%Yb3+:β1-Gd2(MoO4)3激光晶体。按照一类相位匹配,沿匹配角(θ=57.5°,)切割出横截面为5×5mm2,通光长度为8mm的晶体样品作为激光增益介质,端面抛光后置于激光腔中。激光腔输入镜设计为在977nm波长处透过率T=90%,在550-600nm、1000-1080nm和1100-1200nm处透过率T=0.3%;输出镜在1000-1080nm和1100-1200nm处的透过率T=0.3%,在550-600nm处透过率T=80%。采用10W的977nm半导体激光端面泵浦该增益介质,可获得连续功率高于100mW的574nm波长的固体激光输出。另外,使用但不限于使用如下表格中的掺杂不同Yb3+离子浓度的β1-Gd2(MoO4)3晶体作为550-600nm波段固体激光器的增益介质,采用以上的技术方案也能实现自拉曼自倍频激光输出。
增益介质 | Yb3+浓度 |
Yb3+:β1-Gd2(MoO4)3晶体 | 0.5at.% |
Yb3+:β1-Gd2(MoO4)3晶体 | 5.0at.% |
Yb3+:β1-Gd2(MoO4)3晶体 | 8.0at.% |
Yb3+:β1-Gd2(MoO4)3晶体 | 10.0at.% |
实例6:977nm半导体激光端面泵浦Yb3+:β1-Gd2(MoO4)3晶体实现574nm固体脉冲激光输出。
直接将1000-1080nm波段的被动调Q片(如Cr4+:YAG)或声光调Q模块插入实例5中的激光增益介质和输出镜之间,采用977nm半导体激光端面泵浦该增益介质,可实现574nm波长的调Q脉冲激光运转。
Claims (4)
1.一种自拉曼自倍频固体激光器,由增益介质,激光谐振腔和泵浦系统组成,其特征在于:该激光器以一块稀土离子掺杂的同时具有拉曼散射和二阶非线性光学特性的晶体作为增益介质;激光谐振腔由输入和输出镜组成,输入镜设计为在泵浦光波长处透过率T≥80%,在基频激光、拉曼频移激光和倍频激光波长处透过率T≤0.5%,输出镜设计为在基频激光和拉曼频移激光波长处透过率T≤0.5%,倍频激光波长处透过率T≥70%;泵浦系统包括能被该增益介质有效吸收的光源以及放置在该光源和增益介质之间的光学耦合器件。
2.如权利要求1所述激光器的晶体,其特征在于:晶体为β′-Gd2(MoO4)3,属于正交晶系,空间群为单胞参数为 α=β=γ=90°。
3.如权利要求1所述激光器增益介质中的稀土离子,其特征在于:稀土离子及掺杂浓度分别为Er3+(5at.%~50at.%),Yb3+(0.5at.%~10at.%),Nd3+(0.5at.%~10at.%),Ho3+(0.5at.%~5at.%),Tm3+(0.5at.%~10at.%),Dy3+(0.5at.%~5at.%),Tb3+(0.5at.%~5at.%),Sm3+(0.5at.%~5at.%)。
4.一种自拉曼自倍频固体脉冲激光器,其特征在于:在权利要求1所述激光器的增益介质和输出镜之间插入基频激光的调Q或锁模元件,实现自拉曼自倍频的脉冲激光运转。
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