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 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.

1.5-μm high-average power laser amplifier using a Er,Yb:glass planar waveguide for coherent Doppler lidar

2012 ◽  
Author(s):  
Takeshi Sakimura ◽  
Yojiro Watanabe ◽  
Toshiyuki Ando ◽  
Shumpei Kameyama ◽  
Kimio Asaka ◽  
...  
Keyword(s):  
Planar Waveguide ◽  
Average Power ◽  
Doppler Lidar ◽  
High Average Power ◽  
Laser Amplifier ◽  
Power Laser ◽  
Coherent Doppler Lidar

scholarly journals 155-μm high-peak, high-average-power laser amplifier using an Er,Yb:glass planar waveguide for wind sensing coherent Doppler lidar

2019 ◽  
Vol 27 (17) ◽  
pp. 24175 ◽  
Author(s):  
Takeshi Sakimura ◽  
Kenichi Hirosawa ◽  
Yojiro Watanabe ◽  
Toshiyuki Ando ◽  
Shumpei Kameyama ◽  
...  
Keyword(s):  
Planar Waveguide ◽  
Average Power ◽  
High Peak ◽  
Doppler Lidar ◽  
High Average Power ◽  
Laser Amplifier ◽  
Power Laser ◽  
Coherent Doppler Lidar

scholarly journals Design and thermal characteristic analysis of motorized spindle cooling system

2021 ◽  
Vol 13 (5) ◽  
pp. 168781402110208
Author(s):  
Yuan Zhang ◽  
Lifeng Wang ◽  
Yaodong Zhang ◽  
Yongde Zhang
Keyword(s):  
Flow Rate ◽  
High Speed ◽  
Thermal Deformation ◽  
Cooling System ◽  
Thermal Characteristic ◽  
Water Flow Rate ◽  
Thermal Characteristics ◽  
Characteristic Analysis ◽  
Motorized Spindle ◽  
Experiment And Simulation

The thermal deformation of high-speed motorized spindle will affect its reliability, so fully considering its thermal characteristics is the premise of optimal design. In order to study the thermal characteristics of high-speed motorized spindles, a coupled model of thermal-flow-structure was established. Through experiment and simulation, the thermal characteristics of spiral cooling motorized spindle are studied, and the U-shaped cooled motorized spindle is designed and optimized. The simulation results show that when the diameter of the cooling channel is 7 mm, the temperature of the spiral cooling system is lower than that of the U-shaped cooling system, but the radial thermal deformation is greater than that of the U-shaped cooling system. As the increase of the channel diameter of U-shaped cooling system, the temperature and radial thermal deformation decrease. When the diameter is 10 mm, the temperature and radial thermal deformation are lower than the spiral cooling system. And as the flow rate increases, the temperature and radial thermal deformation gradually decrease, which provides a basis for a reasonable choice of water flow rate. The maximum error between experiment and simulation is 2°C, and the error is small, which verifies the accuracy and lays the foundation for future research.

Influence of Thermal Deformations in the Solid Laser Medium on the Emitted Radiation Parameters

2005 ◽  
Vol 219 (8) ◽  
pp. 823-827
Author(s):  
O Donţu ◽  
S Ganatsios ◽  
D Duminica
Keyword(s):  
Laser Beam ◽  
Radial Distribution ◽  
Thermal Deformation ◽  
Processing Parameters ◽  
Beam Intensity ◽  
Laser Medium ◽  
Laser Beam Intensity ◽  
Active Laser ◽  
Thermal Deformations ◽  
Active Laser Medium

The paper presents some remarks about the way in which the thermal deformation in the solid active laser medium influences the radial distribution of the emitted laser beam intensity, implicitly the processing parameters.

Measurement and Analysis on Transient Thermal Characteristics of High Speed Motorized Spindle

2011 ◽  
Vol 52-54 ◽  
pp. 2021-2026
Author(s):  
Gui Ling Deng ◽  
Can Zhou
Keyword(s):  
High Speed ◽  
Thermal Deformation ◽  
Thermal Characteristics ◽  
Measuring System ◽  
Test Results ◽  
Motorized Spindle ◽  
Measurement And Analysis ◽  
Turning Center ◽  
Transient Thermal ◽  
Deformation Compensation

Thermal deformation is an important factor to affect the accuracy of the motorized spindle, the core component of high-speed machine tool. To understand the spindle system transient thermal characteristics of the high-speed turning center CH7516GS, some high-precision sensors and high-frequency data acquisition system is used to establish the temperature and displacement measuring system. The thermal deformation compensation model is established on the basis of the experimental test results.

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