14 W high-efficiency diode-pumped cw Yb:KGd(WO4)2 laser with low thermo-optic aberrations
14 W high-efficiency diode-pumped cw Yb:KGd(WO4)2 laser with low thermo-optic aberrations
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DOI：
10.1016/j.optmat.2012.10.032
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发表时间：
2013-01-01
影响因子：
3.9
通讯作者：
Pavlyuk, A. A.
中科院分区：
文献类型：
--
作者：
Loiko, P. A.;Kisel, V. E.;Pavlyuk, A. A.
在连续工作模式下，对掺Yb ~（3+）的Y_3Al_5O_（12）晶体和N-g切KGd（WO_4）（2）晶体的热透镜效应进行了对比实验研究。对于N-g切Yb：KGd（WO_4）（2），热透镜对所有正交面的光线都是正的，并且比Yb：Y_3Al_5 O_（12）的热透镜弱至少7倍。这与在980 nm泵浦下（与Yb：Y3 Al 5 O 12的940 nm泵浦相比）较低的量子缺陷以及折射率的温度依赖性的负面影响和热膨胀效应对热透镜光功率的正面影响的相互补偿有关。N-g切Yb：KGd（WO_4）（2）热透镜的主衍射面包含光率体的N-p和N-m轴，相应的灵敏度因子M = dD/dP（abs）= 1.38 m（-1）和1.09 m（-1）（相对于吸收的泵浦功率）。利用这种近无热晶体获得了14 W的输出功率、76%的斜率效率和良好的光束质量（M-2 < 1.2）。(c)2012爱思唯尔有限公司版权所有。
A comparative experimental study of thermal lensing effect was performed for diode-pumped Yb3+-doped Y3Al5O12 and N-g-cut KGd(WO4)(2) crystals under cw (continuous wavelength) operation mode. For N-g-cut Yb:KGd(WO4)(2), thermal lens is positive for rays lying in all meridional planes and at least seven times weaker than that of Yb:Y3Al5O12. This is associated with lower quantum defect under 980-nm pumping (in comparison with 940-nm pumping for Yb:Y3Al5O12) and mutual compensation of negative impact of temperature dependence of the refractive index and positive impact of thermal expansion effect to the thermal lens optical power. Principal meridional planes of thermal lens in N-g-cut Yb:KGd(WO4)(2) contain N-p and N-m axes of optical indicatrix; corresponding sensitivity factors M = dD/dP(abs) equal 1.38 m(-1) and 1.09 m(-1) (with respect to absorbed pump power). This near-athermal crystal was utilized to produce air-cooled diode-pumped cw laser with output power of 14 W, impressive slope efficiency of 76% and excellent beam quality (M-2 < 1.2). (c) 2012 Elsevier B.V. All rights reserved.