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Yb:KGW

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Yb:KGW

Yb3+:KGd(WO42(Yb:KGW)是最有前途的激光活性材料之一。Yb:KGW晶体有望取代Nd:YAG晶体和Yb:YAG晶体应用于大功率二极管泵浦激光系统。Yb:KGW在高功率、短脉冲飞秒激光及其广泛应用方面也具有巨大的潜力。

Yb3KGW具有大的吸收系数,低的量子缺陷,高的吸收和发射截面

Yb离子简单的二能级电子结构避免了上转换、激发态吸收和浓度猝灭等非期望的损耗过程。与常用的Nd:YAG晶体相比,Yb:KGW晶体具有更大的吸收带宽、3-4倍的发射寿命、更高的存储容量、更低的量子缺陷,更适合于二极管泵浦。斯托克斯位移越小,加热越小,激光效率越高。与Yb:YAG和Yb:YCOB等掺Yb激光晶体相比,Yb:KGW具有更高的吸收截面(13-17倍)、更低的量子缺陷(~4%)、比Yb:YCOB高9倍的发射截面和比Yb:YAG宽的发射带、高的非线性折射系数和斜率效率最高(87%)。

  • 吸收线宽度宽,无需严格的温度控制即可获得相位匹配的LD泵浦源的泵浦波长;
  • 量子缺陷低,泵浦波长非常接近激光输出波长,导致固有的激光斜率效率高,理论上量子效率可达90%左右;
  • 由于泵浦的能级接近激光的上限,因此没有辐射弛豫的材料中的热负荷很低,仅是掺钕钕激光材料的热负荷的三分之一;
  • 无激发态吸收和上转换,光转换效率高;
  • 荧光寿命长,是相同的掺钕激光材料的三倍以上,有利于能量存储;

物理和化学特性

化学式Yb3+KGdWO42
晶体结构单斜双钨酸盐
密度7.27 g/cm3
传输范围0.35-5.5 μm
莫氏硬度4 to 5
1060 nm的折射率ng = 2.037, np = 1.986, nm=2.033

光学和热学特性

导热系数Ka=2.6 W/mK, Kb=3.8 W/mK, Kc=3.4 W/mK
热光学系数@ 1064 nmdnp/dT=-15.7 * 10-6 K-1
dnm/dT=-11.8 * 10-6 K-1
dng/dT=-17.3 * 10-6 K-1
热膨胀αa=4X10-6 /°C
αb=3.6X10-6 /°C
αc=8.5X10-6 /°C
熔点温度1075 °C
吸收截面1.2X10-19 cm2
受激发射横截面(E || a)2.6X10-20 cm2
激光波长1023-1060 nm
激光阈值35 mW
Yb3 +的2F5/2歧管在77 K时的纯能级(cm-1)10682, 10471, 10188
在77K时,Yb3 +的2F7/2流形的斯塔克能级(以cm-1为单位)535, 385, 163, 0
光学损伤阈值,GW / cm220

光谱性质

吸收峰波长,lpump,[nm]981.2
吸收线宽,Dlpump,[nm]3.7
峰吸收横截面,冒泡,[cm2]1.2×10-19
峰值吸收系数,[cm-1]26
发射波长,lse,[nm]1023
发射线宽,Dlse,[nm]20
峰值发射截面,sse,[cm2]2.8×10-20
量子效应,lpump / lse,[nm]0.959
荧光寿命,tem [ms]0.6

吸收和发射光谱

Yb-KGW激光晶体-吸收放射谱-南京光宝-CRYLINK

参考文献

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