Diode-pumped medium-aperture-size square Nd,Y:CaF2 rod amplifier for Inertial Confinement Fusion laser drivers |
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| Affiliation: | 1. The Academy of Opto-Electronics, Chinese Academy of Sciences, Beijing 100094, China;2. Zhong Ke He Guang (Tianjin) Research Institute of Applied Laser Technology Co., Ltd., Tianjin 300304, China;3. Synthetic Single Crystal Research Center, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201899, China;4. Key Laboratory of Transparent and Opto-functional Inorganic Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201899, China;1. Missouri University of Science and Technology, Department of Chemistry, 400W 11th Street, Rolla, MO, 65409, USA;2. Missouri University of Science and Technology, Department of Mechanical and Aerospace Engineering, Rolla, MO, 65409, USA;3. BK21 Plus, Division of Nano Convergence Technology, Pusan National University, Busan, 609735, South Korea;1. Key Laboratory for Physical Electronics and Devices of the Ministry of Education & Shaanxi Key Lab of Information Photonic Technique, Xi’an Jiaotong University, Xi’an 710049, China;2. Institute of Applied Physics, Xi’an University, 710065, China;1. Faculty of Basic Sciences, Department of Physics, University of Mazandaran, Babolsar, Iran;2. Faculty of Basic Sciences, Department of Physics, University of Velayat, Iranshahr, Iran;1. Department of Electronic Engineering, Xiamen University, Xiamen 361005, China;2. Jiangsu Key Laboratory of Advanced Laser Materials and Devices, School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou 221116, China;3. School of Physics Science and Engineering, Institute for Advanced Study, Tongji University, Shanghai 200092, China |
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| Abstract: | We demonstrate, for the first time, an 12 mm × 12 mm 0.5%Nd,5% Y:CaF2 crystal rod having a uniformly-distributed fluorescence spectrum and capable of operating as an amplifying medium at high repetition frequencies. A small gain of 2.7 is experimentally achieved at repetition frequency of 10 Hz for a pump center wavelength of 802 nm, power and absorption efficiency, 61.2 kW and 63.7%, respectively. Spatial-uniformity degradation of the output near-field beam distribution is observed, which should be attributed to the inhomogeneity of Nd,Y:CaF2 crystal. For a pump power of 61.2 kW, the stored energy of Nd,Y:CaF2 amplifier is 3.73 J. When the input energy is 50 mJ, the output laser energy is 1.4 J of extraction efficiency up to 37.53% after four-pass amplification. |
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| Keywords: | Laser amplifiers Lasers Diode-pumped Laser crystal |
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