CN101000997A - 波长为916nm的Nd:LuVO4激光器 - Google Patents
波长为916nm的Nd:LuVO4激光器 Download PDFInfo
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Abstract
本发明公开了一种波长为916nm的Nd:LuVO4激光器,包括泵源、光学耦合系统、激光谐振腔;所述激光谐振腔由至少两个激光器端镜和置于激光器端镜之间的激光增益介质组成,所述激光增益介质为Nd:LuVO4晶体,所述泵源通过光学耦合系统来泵浦所述激光增益介质。本发明获得916nm激光和通过倍频获得458nm深蓝激光运转。
Description
技术领域
本发明涉及一种激光装置,尤其涉及一种二极管(LD)端面或侧面泵浦的全固态新的波长为916nm的Nd:LuVO4激光器。
背景技术
蓝光激光器在高密度光存储、超短脉冲、数字视频技术、光谱技术、激光医学、激光大屏幕显示、海洋军事应用及水下资源探测中具有十分重要的应用前景。目前产生大功率蓝光激光的有效方法之一是采用900nm左右的激光直接倍频产生蓝光激光输出。利用Nd:YAG晶体人们已经成功地将946nm的激光直接倍频产生高功率473nm蓝光激光输出。但研究表明,在激光大屏幕显示中,为了使其色度更接近于自然光,从而有效地实现三元色的平衡,人们期待获得短于473nm的深蓝激光的出现。近年来,人们在钒酸盐激光晶体的研究中获得重要进展。其中由于Nd:YVO4和Nd:GdVO4晶体的出现,人们已经成功地将基频分别为914nm(Nd:YVO4)和912nm(Nd:GdVO4)激光直接倍频获得了457nm和456nm深蓝激光的输出。最近人们在钒酸盐家族中又成功地研制出一个新的成员,这就是Nd:LuVO4晶体。Nd:LuVO4晶体除了具备钒酸盐晶体具有的诸如良好的激光特性、高的热导率、良好的光学均匀性外,研究表明Nd:LuVO4晶体相对于Nd:YVO4和Nd:GdVO4晶体具有更大的吸收系数和受激发射截面,从而是一个有着更为广泛应用前景的激光晶体。本发明首次报导的916nm基频激光输出为人们获得又一个全新的458nm深蓝激光提供了一个可靠的高效的倍频光源。
发明内容
本发明的目的是提供一种能够产生高功率916nm激光输出的Nd:LuVO4激光器。
为达到上述目的,本发明提供一种能够产生高功率916nm激光输出的Nd:LuVO4激光器,包括泵源、光学耦合系统、激光谐振腔;采用端面或侧面泵浦方式;激光谐振腔为直线腔或折叠腔结构,由激光谐振腔镜、激光增益介质、腔内功能元件(诸如调Q元件、锁模元件、倍频元件等)组成,其中一激光器端镜可通过在增益介质Nd:LuVO4的一个端面上直接镀膜而使激光端镜和激光增益介质合二为一,激光增益介质Nd:LuVO4的另一端面镀增透膜,其他腔镜同样进行镀膜处理。以抑制4F3/2-4I11/2和4F3/2-4I13/2激光运转,获得了4F3/2-4I9/2能级跃迁下916nm激光的高效激光运转。并通过选择腔内功能元件,获得916nm连续激光运转和916nm脉冲(调Q或锁模)激光运转以及通过倍频获得458nm深蓝激光运转。
进一步地,所述泵源可以是端面泵浦的LD Bar光纤耦合半导体激光器,亦可以是LD Bar光束整形半导体激光器,亦可以是LD单管激光器;泵源也可以是侧面泵浦的单条LD Bar列阵激光器,亦可以是多条LD Bar列阵激光器。
进一步地,所述激光增益介质为单棒Nd:LuVO4晶体或复合棒Nd:LuVO4晶体。
进一步地,所述复合棒Nd:LuVO4晶体激光增益介质,由Nd:LuVO4晶体制成,激光晶体两端扩散键合未掺杂的YAG(或LuVO4)晶体。
进一步地,所述激光增益介质运行时需冷却,按不同运行条件温度在1-20℃可调,其控温精度优于±1℃。
进一步地,用所述腔内调Q(主动、被动)功能元件实现调Q运行;或用锁模(主动、被动)功能元件实现锁模运行;或用倍频晶体(LBO、BBO、BiBO、KnbO3)实现倍频输出。
进一步地,激光工作物质可以直接水冷,亦可以用TEC传导冷却(风冷),亦可以水冷和风冷混合式冷却。
进一步地,对所述激光增益介质为Nd:LuVO4晶体,并且在其泵浦端面上直接镀膜(或单独制作激光腔镜镀膜)制成所述激光谐振腔输入端镜时,具体镀膜参数为:(a)端泵时:808nm HT(T>90%),916nm HR(R>99.9%),1.06um HT(T>90%),1.34umHT(T>90%);(b)侧泵时:916nm HR(R>99.9%),1.06um HT(T>90%),1.34um HT(T>90%)。Nd:LuVO4晶体输出端镀膜参数为:916nm AT,1.06um AT,1.34um AT。激光谐振腔输出端镜镀膜参数为:(a)916nm激光运转时:916nm透过率T为0.05%-10%,1.06um HT(T>90%),1.34um HT(T>90%);(b)458nm激光运转时:916nm HR(R>99.9%),1.06um HT(T>90%),1.34um HT(T>90%),458nm HT。
进一步地,所述激光谐振腔内还可放置用于控制光束质量的选模元件。
进一步地,按不同倍频晶体要求控温运行,其控温精度优于±0.5℃。
本发明Nd:LuVO4激光器具有波长为916nm,该激光器利用激光晶体可在4F3/2-4I9/2能级跃迁实现激光运转的特性,采用Nd:LuVO4激光晶体,同时通过对谐振腔镜合理的膜系设计成功地抑制了4F3/2-4I11/2和4F3/2-4I13/2激光运转,获得了4F3/2-4I9/2连续激光高效运转经倍频获得458nm深蓝激光输出。
附图说明
图1是本发明Nd:LuVO4激光器的实施例1和3的结构示意图;
图2是本发明实施例2的结构示意图。
附图标记:
1-二极管泵源 2-光学耦合系统 3-激光谐振腔输入端镜
4-激光增益介质 5-腔内功能元件 6-激光谐振腔输出端镜
具体实施方式
实施例1:
二极管Bar经光纤耦合端面泵浦的Nd:LuVO4激光器产生916nm的激光波长及其倍频后产生458nm激光波长。
如图1所示,二极管泵源1为25W光纤耦合半导体激光器,其工作波长为808nm,光纤芯径为200um,经光学耦合系统2聚焦的光斑尺寸大约为240um,激光增益介质4为0.5at.%掺杂的Nd:LuVO4晶体,其尺寸为3×3×2mm3,激光增益介质通过热沉水冷,其温度控制在6℃,在激光增益介质4的泵浦端面上直接镀膜,使激光谐振腔输入端镜3与激光增益介质4合而为一,镀膜参数为R>99.9%@916nm,T=90%@808nm,T=90%@1.06um&1.34um,激光增益介质4的另一端面对916nm和1.06um&1.34um镀增透膜,基频916nm激光实验中没有倍频晶体5,激光输出镜6是曲率半径为100mm的平凹镜,其镀膜情况为T=3.6%@916nm。对倍频实验方案,激光腔内放置LBO倍频晶体5,其两个端面对916nm和458nm镀增透膜,尺寸为3×3×10mm3,按I类相位匹配方式切割,切割参数为θ=90°,φ=21.8°温度控制在6±0.1℃;激光谐振腔输出端镜6是曲率半径为100mm的平凹镜,其镀膜情况为R>99.9%@916nm,HR@458nm,基频实验谐振腔长为18mm,倍频实验谐振腔长为40mm。
用上述装置可获得900mW的916nm激光输出和50mW的倍频458nm蓝光输出。
实施例2:
单条列阵激光二极管经光束耦合侧面泵浦的波长为916nm的Nd:LuVO4激光器。
如图2所示,二极管泵源1为40W单条列阵激光二极管泵源,其工作波长为808nm,经光学耦合系统2聚焦的光斑尺寸大约为100×500um2,激光增益介质4为0.2at.%掺杂的Nd:LuVO4晶体,其尺寸为3×3×5mm3,激光增益介质通过热沉水冷,其温度控制在6℃,在激光增益介质4的左端面上直接镀膜,使激光谐振腔左端镜3与激光增益介质4合而为一,镀膜参数为R>99.9%@916nm,T=90%@808nm,T=90%@1.06um&1.34um,激光增益介质4的另一端面对916nm和1.06um&1.34um镀增透膜,激光谐振腔输出端镜(右端镜)6是曲率半径为100mm的平凹镜,其镀膜情况为T=3.6%@916nm。谐振腔长为18mm。
用上述装置可获得大于1W的916nm激光输出。
实施例3:
二极管单管直接泵浦的波长为916nm的Nd:LuVO4激光器。
如图1所示,二极管泵源1为8W单管半导体激光器,其工作波长为808nm,发光截面为150×1um2,经光学耦合系统2聚焦后的光斑尺寸大约为50×50um2,激光增益介质4为0.2at.%掺杂的Nd:LuVO4晶体,其尺寸为3×3×4mm3,激光增益介质通过热沉水冷,其温度控制在6℃,在激光增益介质4的泵浦端面上直接镀膜,使激光谐振腔输入端镜3与激光增益介质4合而为一,镀膜参数为R>99.9%@916nm,T=90%@808nm,T=90%@1.06um&1.34um,激光增益介质4的另一端面对916nm和1.06um&1.34um镀增透膜,激光谐振腔输出端镜6是曲率半径为100mm的平凹镜,其镀膜情况为T=3.6%@916nm。谐振腔长为18mm。
用上述装置可获得200mW的916nm激光输出。
Claims (10)
1.一种LD端面或侧面泵浦的全固态波长为916nm的Nd:LuVO4激光器,其特征在于,包括泵源、光学耦合系统、激光谐振腔;采用端面或侧面泵浦方式;激光谐振腔为直线腔或折叠腔结构,由激光谐振腔镜、激光增益介质、腔内功能元件(诸如调Q元件、锁模元件、倍频元件等)组成,其中一激光器端镜可通过在增益介质Nd:LuVO4的一个端面上直接镀膜而使激光端镜和激光增益介质合二为一,激光增益介质Nd:LuVO4的另一端面镀增透膜,其他腔镜同样进行镀膜处理。以抑制4F3/2-4I11/2和4F3/2-4I13/2激光运转,获得了4F3/2-4I9/2能级跃迁下916nm激光的高效激光运转。该激光器可通过不同的泵浦方式实现916nm连续或脉冲激光高效运转,也可以通过选择腔内功能元件,实现调Q或锁模激光运转以及通过倍频获得458nm深蓝激光运转。
2.如权利要求1所述的LD泵浦全固态波长为916nm的Nd:LuVO4激光器,其特征在于,所述泵源是端面泵浦的LD Bar光纤耦合半导体激光器、LD Bar光束整形半导体激光器、LD单管激光器、侧面泵浦的单条LD Bar列阵激光器或是多条LD Bar列阵激光器。
3.如权利要求2所述的LD泵浦全固态波长为916nm的Nd:LuVO4激光器,其特征在于,所述激光增益介质为单棒Nd:LuVO4晶体或复合棒Nd:LuVO4晶体。
4.如权利要求3所述的LD泵浦全固态波长为916nm的Nd:LuVO4激光器,其特征在于,所述复合棒Nd:LuVO4晶体激光增益介质,由Nd:LuVO4晶体制成,激光晶体两端扩散键合未掺杂的YAG或LuVO4晶体。
5.如权利要求3或4所述的LD泵浦全固态波长为916nm的Nd:LuVO4激光器,其特征在于,所述激光增益介质运行时需冷却,按不同运行条件温度在1-20℃可调,其控温精度优于±1℃。
6.如权利要求1或5所述的LD泵浦全固态波长为916nm的Nd:LuVO4激光器,其特征在于,用所述腔内调Q(主动、被动)功能元件实现调Q运行;或用锁模(主动、被动)功能元件实现锁模运行;或用倍频晶体(LBO、BBO、BiBO、KnbO3)实现倍频输出。
7.如权利要求6所述的LD泵浦全固态波长为916nm的Nd:LuVO4激光器,其特征在于,激光工作物质可以直接水冷,亦可以用TEC传导冷却(风冷),亦可以水冷和风冷混合式冷却。
8.如权利要求7所述的LD泵浦全固态波长为916nm的Nd:LuVO4激光器,其特征在于,对所述激光增益介质为Nd:LuVO4晶体,并且在其泵浦端面上直接镀膜(或单独制作激光腔镜镀膜)制成所述激光谐振腔输入端镜时,具体镀膜参数为:(a)端泵时:808nm HT(T>90%),916nm HR(R>99.9%),1.06um HT(T>90%),1.34um HT(T>90%);(b)侧泵时:916nm HR(R>99.9%),1.06um HT(T>90%),1.34um HT(T>90%)。Nd:LuVO4晶体输出端镀膜参数为:91nm AT,1.06umAT,1.34um AT。激光谐振腔输出端镜镀膜参数为:(a)916nm激光运转时:916nm 透过率T为0.05%-10%,1.06um HT(T>90%),1.34um HT(T>90%);(b)458nm激光运转时:916nm HR(R>99.9%),1.06um HT(T>90%),1.34um HT(T>90%),458nm HT。
9.如权利要求8所述的LD泵浦全固态波长为916nm的Nd:LuVO4激光器,其特征在于,所述激光谐振腔内还可放置用于控制光束质量的选模元件。
10如权利要求9所述的LD泵浦全固态波长为916nm的Nd:LuVO4激光器,其特征在于,按不同倍频晶体要求控温运行,其控温精度优于±0.5℃。
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CN101976797A (zh) * | 2010-10-09 | 2011-02-16 | 山西大学 | 单光子光学谐振腔的锁定方法及其装置 |
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