Influence of doping concentration on the power performance of diode-pumped continuous-wave Tm3+:YA1O3 lasers

被引:43
作者
Kalaycioglu, H [1 ]
Sennaroglu, A [1 ]
Kurt, A [1 ]
机构
[1] Koc Univ, Laser Res Lab, Dept Phys & Elect Electron Engn, TR-34450 Sariyer Istanbul, Turkey
关键词
Cross relaxation; diode-pumped solid-state lasers; mid-infrared lasers; spectroscopic measurements; Tm : YAP lasers;
D O I
10.1109/JSTQE.2005.850597
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
We investigated the effect of thulium ion concentration on the continuous-wave (CW) power performance of diode single-end-pumped thulium-doped YAIO(3) (Tm:YAP) lasers. Three samples with 1.5%, 3%, and 4% Tm3+ concentration were examined at 18 degrees C. Lifetime and fluorescence measurements were further performed to assess the strength of cross relaxation and nonradiative decay. Our results showed that in single-end-pumped configurations, the best CW power performance was obtained with the 1.5% Tm:YAP sample, and laser performance of the samples degraded monotonically with increasing Tm3+ concentration. By using 9.5 W of incident pump power at 797 run, a maximum of 1430 mW of output power was obtained with the 1.5% Tm:YAP sample and 2% output coupler. We discuss how the effects of cross relaxation, reabsorption, nonradiative decay, and internal heating vary with increasing concentration. Spectroscopic measurements and rate-equation analysis suggest that cross relaxation should already be effective in samples with 1.5% Tm3+ ion concentration and doping concentrations larger than 4% will lead to degradation in power performance due to higher nonradiative decay rates and larger reabsorption losses.
引用
收藏
页码:667 / 673
页数:7
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