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1. 福州大学, 至诚学院,福建 福州,350007
2. 福建师范大学, 化学与材料技术学院,福建 福州,350007
3. 福建工程学院, 数理系,福建 福州,350014
Published:20 May 2007,
Received:25 August 2006,
Revised:24 November 2006,
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吕少珍, 杨文琴, 姚少波, 庄建. Yb<sup>3+</sup>离子掺杂钨酸钾钆晶体的光谱参数[J]. 发光学报, 2007,28(3): 367-372
L&#220; Shao-zhen, YANG Wen-qin, YAO Shao-bo, ZHUANG Jian. Spectral Parameters of Yb<sup>3+</sup>:KGW[J]. Chinese Journal of Luminescence, 2007,28(3): 367-372
从Yb
3+
:KGd(WO
4
)
2
(KGW)的吸收谱和荧光谱出发
利用倒易理论计算其各个光谱参量
如吸收截面
受激发射截面
辐射寿命等.由于Yb
3+
:KGW晶体较适合用作二极管泵浦的激光器的材料
而激光二极管所发出的光是偏振光
晶体又是双折射晶体
因此研究了泵浦光的不同通光方向和偏振方向对Yb
3+
:KGW晶体荧光光谱的影响.实验表明在不同情况下其对晶体荧光强度影响较大
因此在设计用激光二极管泵浦的激光器时
应考虑合适的泵浦光偏振方向和入射在晶体上的轴向
其中泵浦光的通光方向比泵浦光偏振方向对晶体的荧光强度的影响更大.对按晶轴切割的这两种晶体
相同实验条件下
荧光强度
I
c
>
I
b
>
I
a
.对于按折射率主轴切割的来说
荧光强度
I
Np
>
I
Ng
>
I
Nm
.在通光方向为
c
轴
偏振方向平行
b
轴时得到了最大的荧光强度.
KGd(WO
4
)
2
laser crystal is a new laser substance material developed upon CaWO
4
crystal. Regardless operated in freedom
under control of Q value or LD pumping
it shows high efficiency. It has good mechanism and optics behave
and can be high-doped.It has potential in non-linearity and Raman scatter area. So the crystal supposes to be premising substance in the field of medical treatment
communication
electronics
remote sensing
industry and so on. Yb ion doping into this kind crystal can be used as femto-second laser material.Now it gets many attention and became a research hotspot. The absorption spectra and fluorescent spectra of Yb
3+
:KGW laser crystal were measured. From the absorption spectrum of Yb
3+
:KGW at room temperature
absorption peaks were found in the range from 900 to 1050nm
with three main peaks
982
954 and 936nm. The 982nm peak is the strongest absorption peak
which can match the emission wavelength of InGaAs LD. It means this kind crystal is suitable for LD pumping. Form the fluorescent spectrum
four fluorescent peaks
982
998
1017 and 1036nm were found. The 982nm is the strongest fluorescent peak but also strongest absorption peak
so the laser emission in this wavelength can't be realized but the wavelength of 1017 and 1 036nm can do it. Form the absorption and fluorescent spectrum
the value of stark energy spit was make out
with 10 682
10 471
10 188cm
-1
in up-level and 535
358
163
0cm
-1
in the down-level. Using Reciprocity method
the absorption cross-section
emission cross-section and fluorescent lifetime were calculated. The absorption cross-section is large
with the value of 1.43710
-19
cm
2
this means Yb
3+
:KGW is good for the absorption of pumping light.The value of emission cross-section is 2.44410
-18
cm
2
and it can used for laser emission.This crystal has longer fluorescent lifetime of 0.306ms
benefit for energy storage. Because KGW is double-axis crystal
has different character in each direction. The paper emphasize on the influence of this identity to its spectrum behave
take it suit for LD puming into account. The infection of palarization direction and incidence direction of pumping light to crystal fluorescent spectra were measured
it may be theory basis for design LD pumping solid laser. It was found that every state is different.So when LD pumping such laser crystal was designed
the incidence and polarization direction should be taken into account. The influence of the incidence direction seems stronger than that of the polarization direction. The fluorescent intension with different incidence direction is
I
c
>
I
b
>
I
a
and
I
Np
>
I
Ng
>
I
Nm
. When light incidence is in
c
axis and the polarization is parallel
b
axis
the flurescent intension is the strongest.
KGd(WO4)2受激发射截面偏振性能
KGd(WO4)2emission cross-sectionpolarization characteristic
Kushawaha V,Banerjee A,Major L.High-efficiency flash lamp-pumped Nd:KGW[J].Laser Appl.Phys.B,1993,56(4):239-242.[2] Stankov K A,Marowsky G.High efficiency multicolour Q-switched Nd:KGW laser[J].Appl.Phys.B,1995,61(2):213-215.[3] Esmeria J M,IshiiJr H,Sato M.Efficiency continuous-wave lasing operation of Nd:KGW at 1 067nm with diode and Ti sapphire laser pumping[J].Opt.Lett.,1995,20(4):1538-1540.[4] Zhao Tingjie,Tu Chaoyang,Luo Zhundu.Experiment study of Nd:KGW laser pumped by laser diode[J].Chin.Phys.Lett.,1996,13(3):178-181.[5] Zhang Jincun,Gong Feng.Yb ion doped laser crystal[J].Laser & Infrared (激光与红外),2002,32(3):143-145 (in Chinese).[6] Chen Yujin.Preparation and spectroscopic properties of rare earch ions[D].The Masteral Thesis,Fuzhou:Fujian Ins-titute of Matter Structure,Chinese Academy of Sciences,2004,135-137.[7] Pujor M C,Bursukova M A,Guell F,et al.Growth,optical characterization,and laser operation of a stoichimetric crystal KYW[J].Phys.Rev.B,2002,65(16):1615121-161532.
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