scholarly journals Modeling and Measurement of Thermal Effect in a Flashlamp-Pumped Direct-Liquid-Cooled Split-Disk Nd:LuAG Ceramic Laser Amplifier

Photonics ◽  
2021 ◽  
Vol 8 (4) ◽  
pp. 97
Author(s):  
Shengzhe Ji ◽  
Wenfa Huang ◽  
Tao Feng ◽  
Long Pan ◽  
Jiangfeng Wang ◽  
...  
Keyword(s):  
Thermal Stress ◽  
Thermal Effects ◽  
Thermal Deformation ◽  
High Energy ◽  
Gain Medium ◽  
Wavefront Aberration ◽  
Experimental Measurements ◽  
Laser Amplifier ◽  
Design And Optimization ◽  
Ceramic Laser

In this paper, a model to predict the thermal effects in a flashlamp-pumped direct-liquid-cooled split-disk Nd:LuAG ceramic laser amplifier has been presented. In addition to pumping distribution, the model calculates thermal-induced wavefront aberration as a function of temperature, thermal stress and thermal deformation in the gain medium. Experimental measurements are carried out to assess the accuracy of the model. We expect that this study will assist in the design and optimization of high-energy lasers operated at repetition rate.

scholarly journals Influence of thermal reduced depolarization on a repetition-frequency laser amplifier and compensation

2015 ◽  
Vol 3 ◽  
Author(s):  
Xin-ying Jiang ◽  
Xiong-wei Yan ◽  
Zhen-guo Wang ◽  
Jian-gang Zheng ◽  
Ming-zhong Li ◽  
...  
Keyword(s):  
Thermal Stress ◽  
Thermal Deformation ◽  
Average Power ◽  
Thermal Characteristics ◽  
Frequency Doubling ◽  
Laser Medium ◽  
Laser Amplifier ◽  
Power Laser ◽  
Depolarization Effect ◽  
Frequency Laser

Thermal stress can induce birefringence in a laser medium, which can cause depolarization of the laser. The depolarization effect will be very severe in a high-average-power laser. Because the depolarization will make the frequency doubling efficiency decline, it should be compensated. In this paper, the thermal characteristics of two kinds of materials are analyzed in respect of temperature, thermal deformation and thermal stress. The depolarization result from thermal stress was simulated. Depolarization on non-uniform pumping was also simulated, and the compensation method is discussed.

scholarly journals LD-pumped gas-cooled multislab Nd:glass laser amplification to joule level

2018 ◽  
Vol 6 ◽  
Author(s):  
Wenfa Huang ◽  
Jiangfeng Wang ◽  
Xinghua Lu ◽  
Tingrui Huang ◽  
Jiangtao Guo ◽  
...  
Keyword(s):  
Pump Energy ◽  
High Energy ◽  
Wavefront Aberration ◽  
Laser Amplifier ◽  
Thermally Induced ◽  
Laser Amplification ◽  
Helium Gas ◽  
Gas Cooling ◽  
Diode Pumped ◽  
Nd:Glass Laser

We demonstrate a laser diode end-pumped helium gas-cooled multislab Nd:glass laser amplifier. The design and thermal management of the proposed laser amplifier are discussed. The thermally induced wavefront aberration of the slabs was also measured and compared with simulation results. A small-signal single-pass longitudinal gain of 1.8 was measured with a pump energy of 7.3 J. With an injected seed energy of 0.6 mJ, the output energy from the amplifier reached 0.5 J at 0.2 Hz and 0.43 J at 0.5 Hz in a multipass extraction geometry, thus demonstrating the feasibility of diode-pumped, high-energy lasers with direct gas cooling.

scholarly journals Thermal lens analysis in a diode-pumped 10 Hz 100 mJ Yb:YAG amplifier

2020 ◽  
Vol 8 ◽  
Author(s):  
Victor Hariton ◽  
Celso Paiva João ◽  
Hugo Pires ◽  
Mario Galletti ◽  
Gonçalo Figueira
Keyword(s):  
Temperature Distribution ◽  
Thermal Lens ◽  
Focal Length ◽  
High Energy ◽  
Gain Medium ◽  
Thermal Lensing ◽  
Experimental Measurements ◽  
Pumping Power ◽  
Diode Pumped ◽  
Spatio Temporal

We address the power scaling issue in end-pumped laser rod amplifiers by studying, experimentally and numerically, the magnitude of thermal lensing in a high-energy diode-pumped Yb:YAG crystal. The spatio-temporal temperature profile of the gain medium and the focal length of the induced thermal lens are determined numerically. The influence of the repetition rate and pumping power on the temperature distribution is analyzed. Experimental measurements covered repetition rates between 1 and 10 Hz and up to 4 kW pumping power.

Maximum Local Thermal Effects Carpet Plot for Symmetric Laminated Composite Plates

2011 ◽  
Vol 250-253 ◽  
pp. 3748-3751 ◽  
Author(s):  
Ahmad Beng Hong Kueh ◽  
Wai Wai Seh ◽  
Poi Ngian Shek ◽  
Cher Siang Tan ◽  
M.Md. Tahir
Keyword(s):  
Thermal Stress ◽  
Thermal Effects ◽  
Laminated Composite ◽  
Composite Plates ◽  
Stress And Strain ◽  
Laminated Composite Plates ◽  
Design And Optimization ◽  
Independent Variables ◽  
Ply Orientation ◽  
Heat Loads

Maximum local thermal effects carpet plots for symmetric laminated composite plates used in the design and optimization for material under heat loads are produced and demonstrated. The independent variables considered in this paper are the proportions of 0, 45, and 90 degrees ply orientations in the laminates. The carpet plots are presented in such a way that when the failure stress or strain of a composite lamina is known, all possible safe ply orientation proportion can be determined. In addition, the dependency of the carpet plots in correspondence to the temperature change is investigated. It is found that the shapes of both thermal stress and strain plots are practically identical.

Measurement of thermal effects in solid-state laser gain medium by digital holography

2014 ◽  
Author(s):  
Xiaoyuan Peng ◽  
Yang Yu ◽  
Zhaomin Wang ◽  
Weijuan Qu ◽  
Chee Yuen Cheng ◽  
...  
Keyword(s):  
Solid State ◽  
Thermal Effects ◽  
Digital Holography ◽  
Gain Medium ◽  
Solid State Laser ◽  
State Laser ◽  
Laser Gain

Study on Thermal Analysis of the Shape of Improved Electric Cooker Liner Based on ANSYS Workbench

2014 ◽  
Vol 487 ◽  
pp. 568-571
Author(s):  
Yan Li Su ◽  
Lei Li ◽  
Wei Guo Han
Keyword(s):  
Thermal Analysis ◽  
Thermal Stress ◽  
Stress Analysis ◽  
Thermal Effects ◽  
The Body ◽  
Total Deformation ◽  
Ansys Workbench

In this paper, a comparative thermal analysis is carried out according to the bottom of HR-FD51 electric cooker liner about a large or small fillet. And then the thermal analysis results are applied to stress analysis as the body loads. The results show that it can reduce thermal stress and total deformation with a large fillet, thereby, improves the lifespan of electric cooker liner and thermal effects as well.

Modeling time-temperature history and sterilization value of mango puree under conventional and microwave assisted pasteurization

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Tamires K. Oishi ◽  
Jorge A. W. Gut
Keyword(s):  
Microwave Heating ◽  
Process Analysis ◽  
Residual Activity ◽  
High Energy ◽  
Temperature History ◽  
Design And Optimization ◽  
Nutritional Characteristics ◽  
Mass Dispersion ◽  
Flow Heat ◽  
Helical Tubes

Abstract Continuous pasteurization of liquid foods has to provide the desired lethality level to guarantee food safety with minimum degradation of quality attributes (sensorial and nutritional characteristics) and high energy efficiency. To optimize quality and cost, a thermal process should be modeled considering flow, heat transfer and mass dispersion principles; however, flow through helical tubes and microwave heating require a complex 3D multiphysics approach. Herein a simplified 2D approach is presented to model a hybrid pasteurization unit with conventional and microwave heating under laminar flow to predict axial and radial distributions of temperature and residual activity of a microorganism or enzyme. A study case of 20 °Brix mango puree (power law fluid) processing is used to test the model based on an existing pilot plant unit. Results were useful to compare conventional and microwave heating regarding the process sterilization value and model can be used for process analysis, design and optimization.

Adhesion Force Between High Energy Surfaces in Vapor Atmosphere

1994 ◽  
Vol 366 ◽  
Author(s):  
Jerome Crassous ◽  
Jean-Luc Loubet ◽  
Elisabeth Charlaix
Keyword(s):  
Liquid Bridge ◽  
Adhesion Force ◽  
Van Der Waals ◽  
Surface Force ◽  
High Energy ◽  
Attractive Force ◽  
Experimental Measurements ◽  
Metallic Substrates ◽  
Energy Surfaces ◽  
Good Agreement

ABSTRACTWe report experimental measurements of the adhesion force between metallic substrates in undersaturated heptane vapor atmosphere, with a surface force apparatus. The attractive force between the substrates is strongly dependant of the condensation of a liquid bridge connecting the surfaces. The results show the importance of wetting phenomena for the maximum attractive force: we find that this maximum attraction varies as the power two-third of the curvature of the meniscus connecting the surfaces, in good agreement with the theory of Van der Waals wetting.

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