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Chin. Opt. Lett.
 Home  List of Issues    Issue 02 , Vol. 03 , 2005    Influence of the KTP crystal boundary temperature on conversion efficiency in high power green laser


Influence of the KTP crystal boundary temperature on conversion efficiency in high power green laser
Degang Xu, Jianquan Yao, Baigang Zhang, Shiyong Zhao, Rui Zhou, Xin Ding, Wuqi Wen, Peng Wang
College of Precision Instrument and Opto-Electronics Engineering, Institute of Laser and Optoelectronics, TianjinUniversity, Tianjin 300072
Cooperated Institute of Nankai University and Tianjin University, Tianjin 300072
Key Lab. of Optoelectric Information Science and Technology, Ministry of Education, Tianjin University, Tianjin 300072

Chin. Opt. Lett., 2005, 03(02): pp.85-85-

DOI:
Topic:Lasers and laser optics
Keywords(OCIS Code): 140.3480  140.6810  190.2620  190.4870  

Abstract
The influence of the KTiOPO4 (KTP) crystal boundary temperature on conversion efficiency in high power green laser has been studied theoretically and experimentally. Temperature distribution inside the KTP crystal has been analyzed by solving the thermal conductivity equation. From the temperature distribution inside the KTP crystal, we have calculated the optimal phase-matching angles of the type-II KTP crystal as a function of temperature. The second-harmonic conversion efficiency as a function of temperature has also been calculated. In the experiment, two KTP crystals with different phase-matching angles were used in the intrcavity-frequency-doubled resonator. When the boundary temperature of KTP-A (φ = 23.6o, θ = 90o under the condition of 27 oC temperature) was setting at 4 oC, a maximum green light power of 104 W was generated at repetition rate of 20.7 kHz and pulse width of 132 nm with pumping current of laser diode of 18.3 A, leading to 10.2% optical-to-optical conversion efficiency. When KTP-B crystal (φ = 24.68o, θ = 90o under the condition of 80 oC temperature) was employed, an average output power of 110 W at 532 nm has been achieved with values of 11.5% and 2% for the optical-to-optical efficiency and the instability, respectively. The optimal boundary temperature of this KTP crystal has been found to be 48.8 oC.

Copyright: © 2003-2012 . This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Received:2004/8/9
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Get Citation: Degang Xu, Jianquan Yao, Baigang Zhang, Shiyong Zhao, Rui Zhou, Xin Ding, Wuqi Wen, Peng Wang, "Influence of the KTP crystal boundary temperature on conversion efficiency in high power green laser," Chin. Opt. Lett. 03(02), 85-85-(2005)

Note: This work was supported by the National "863" Program of China (No. 2002AA311190), the Opto-Electronic United Science Research Center of Tianjin (No. 013184011), the National Natural Science Foundation of China (No. 60278001), the Science & Technology Cooperation Foundation of Nankai University and Tianjin University, and the Ph.D. and the Outstanding Doctorate Dissertation of Tianjin University. D. Xu's e-mail address is xudegang8360@126.com.



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