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Based on the repetition frequency gradient doping medium flakes laser amplifier thermal effects of characteristics of

Author: DanXiaoTong
Tutor: ZhangXiongJun
School: Chinese Academy of Engineering Physics
Course: Optical Engineering
Keywords: Solid-state laser Thermal Management Non-uniform doping Yb: YAG Diode-pumped
CLC: TN248.1
Type: Master's thesis
Year: 2011
Downloads: 23
Quote: 0
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Abstract


The laser-driven inertial fusion energy is one of the viable new energy solutions. High energy laser inertial confinement fusion energy applications, the repetition frequency of the solid-state laser device needs to run, the scientists of the world are actively carry out high-energy, the repetition frequency diode-pumped solid-state laser device research work, which, due to the high energy repetition frequency run serious heat load problem facing researchers is different from the past, one of the challenges. In this thesis through theoretical modeling and simulation methods to explore a gradient of the gain medium activated ion doped to improve medium heat deposition and cooling space coupling medium heat level, to improve the thermal management efficiency of solid-state laser amplifier the positive pump-sheet conformation laser amplifier thermal deposition caused by cooling bifacial larger temperature and temperature gradient, its thermal management achieve the same or even higher than the back pump sheet configuration amplifier and the back pump flakes configuration amplifier level, while retaining the simple coating of the positive pump configuration, the advantages of the pump light is not subject to disturbance of the cooling fluid. To carry out research work are as follows: 1. Consider the physical properties of the gain medium with the doping concentration and temperature changes, the dielectric characteristics of the thermal effects, three-dimensional time-multi-physics coupling model. Is pump Yb: YAG flakes configuration amplifier temperature, the thermal characteristics of the stress - strain, wavefront distortion, stress induced depolarization loss and gain characteristics were simulated; parameters of different media, pumps, cooling medium. The characteristics of the thermal effects discussed. 2 to carry out a steady-state and transient analysis of gradient doping dielectric characteristics of the thermal effects, the study results show that: by increasing the dopant concentration gradient within the medium, lower medium thickness, the temperature of the medium, mechanical and optical properties will be significantly improved. However, with the doping concentration gradient of rise with the media sheet thickness reduction, the gain level of the medium will be reduced because ASE effect. Therefore, doping gradient medium parameters to optimize the design needs to consider the relationship of the thermal effects of loss and gain, to ensure that the amplifier operates in the best condition. 3 based on the dielectric properties of gradient doping for output indicator 10J, 10Hz, 10ns of Yb: YAG laser amplifier gain medium of the optimal design, the results show that: the average temperature within the gain medium reduces 10.97K, the temperature gradient from 13.69K/mm decline to 4.01K/mm. Wavefront distortion maximum decrease of 6.4%, the maximum stress induced depolarization loss decreased by 25.74%. The improvement in the thermal, optical and mechanical properties of the single-pass gain of the amplifier is an increase of 11.11% compared with that before optimization. 4 because there are certain difficulties in the prior case, the doping concentration was prepared continuously changing medium. Aggregate preparation to achieve a lower degree of difficulty of the multi-piece key gradient doping medium feasibility study. The results show that the multi-chip bonding medium can play to enhance the performance of the amplifier thermal management role. 5. Carry out calibration larger studies based on gradient-doped dielectric method to enhance the performance of solid-state laser amplifier thermal management. The gain medium of the sheet bonding white sheet programs, while ensuring the gradient doping medium thermal management, and enhance the mechanical strength of the large-caliber medium. The calculation results show that the average temperature and temperature distribution in the medium are essentially unchanged, to meet the thermal management of thousands of Joules level laser amplifier gain medium to enhance the demand in the case of amplifier caliber expanded gradient doping.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Photonics technology,laser technology > Laser technology, the maser > Laser > Solid-state lasers
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