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Song E.,Huazhong University of Science and Technology | Song E.,National Engineering Research Center for Laser Processing | Zhu G.,Huazhong University of Science and Technology | Zhu G.,National Engineering Research Center for Laser Processing | And 6 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2016

In this paper, a thin disk multi-pass amplification system is designed based on the conjugated double parabolic mirror pumping thin disk laser module, which realizes 20 passes transmitting through the thin disk crystal. The light transmission matrix is used to optimize optical mode matching of seed laser spot size and pumping spot size during the multi-pass transmission. At the same time, anti-misalignment stability of the thin disk multi-pass amplification system and the aberration of output laser beam are analyzed in deeply. © 2016 SPIE.


Wang M.,Huazhong University of Science and Technology | Wang M.,National Engineering Research Center for Laser Processing | Zhu G.,Huazhong University of Science and Technology | Zhu G.,National Engineering Research Center for Laser Processing | And 6 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2016

An numerical model considering solder viscoplasticity is developed to analyze the thermal deformation of laser disk with indium bonded. The characteristic of soft bonding material is described using Anand viscoplasticity model. The Finite Element Method analytical results show that the back surface of laser disk with pumping will deform more significantly with time and finally be steady. Correspondingly the refraction power increase gradually and diffraction loss induced by aspherical aberration decrease gradually. Futhermore when pump spot is larger the refraction power and aspherical aberration will change more due to solder viscoplasticity. © 2016 SPIE.


Lin Z.,Huazhong University of Science and Technology | Lin Z.,National Engineering Research Center for Laser Processing | Zhu X.,Huazhong University of Science and Technology | Zhu X.,National Engineering Research Center for Laser Processing | And 12 more authors.
Journal of the Optical Society of America B: Optical Physics | Year: 2017

The amplified spontaneous emission (ASE) effect is a major factor affecting large size, high gain Yb:YAG thin disk lasers. In this paper, a model combining the rate equations including an ASE effect term and nonuniform temperature distribution in a thin disk crystal is presented. A numerical iterative method is used to analyze the dynamic behavior, the space distribution of ASE effect, and the optimum coupler reflectivity of the thin disk laser. It is shown that the temperature distribution and the size of the pump region are the main factors to influence the ASE effect and ultimately affect the output power and threshold of the laser system. In order to decrease the ASE effect, the coupler reflectivity can be adjusted to control the gain coefficient to increase output power. © 2017 Optical Society of America.


Huang Y.,Huazhong University of Science and Technology | Huang Y.,National Engineering Research Center for Laser Processing | Zhu X.,Huazhong University of Science and Technology | Zhu X.,National Engineering Research Center for Laser Processing | And 12 more authors.
Optics Express | Year: 2015

A multi-pass pumping scheme for thin disk lasers consisting of dual parabolic mirrors with conjugated relationship is presented. The anti-disturbance ability of pumping is analyzed by ray tracing method under different kinds of disturbances. Both theoretical and experiment results show that disturbances in this system won't lead to a misalignment of each pumping spot, but only the position of superposed pumping spot on disk crystal will be changed. Compared with the multi-pass pumping scheme consisting of parabolic mirror and folding prisms, this pumping scheme has a better anti-disturbance ability. © 2015 Optical Society of America.


Shang J.,Huazhong University of Science and Technology | Shang J.,National Engineering Research Center for Laser Processing | Zhu X.,Huazhong University of Science and Technology | Zhu X.,National Engineering Research Center for Laser Processing | And 10 more authors.
Zhongguo Jiguang/Chinese Journal of Lasers | Year: 2010

In order to convert a laser Gaussian beam to a collimated flat-top beam, a new reshaper with only one aspheric lens is designed based on double aspheric lenses reshaper. In the theoretical model, a more accurate calculation method of curves function of aspheric lens is given. The reshaping effection, brought by the change from the parameter of system and laser beam, is given through numerical analysis and optical design software simulation. It is illustrated that the flatten degree of the laser beam can be improved apparently using this new kind of reshaper. The novel method avoids some shortcomings of traditional refractive optical reshaper such as large volume, complexity of regulating, etc, and enhances the reliability and practicability of device.


Lin H.,Huazhong University of Science and Technology | Lin H.,National Engineering Research Center for Laser Processing | Wang H.,Huazhong University of Science and Technology | Wang H.,National Engineering Research Center for Laser Processing | And 6 more authors.
Optical Engineering | Year: 2016

We present a laser beam shaper designed to obtain a homogeneous line beam. A beam shaping system was designed based on cutting and rearranging optics, using two groups of plane parallel plates. The analysis of beam uniformity was performed by use of ray tracing simulation through ZEMAX software and experimental validation. The simulation results show that in the focal plane, a beam width of 1 mm (@95%Imax) and a uniformity of 90.2% are achieved in one direction, and a Gaussian profile with a beam width of 0.06 mm (FWHM) is achieved in the other direction. © 2016 Society of Photo-Optical Instrumentation Engineers (SPIE).


Wang D.,Huazhong University of Science and Technology | Wang D.,National Engineering Research Center for Laser Processing | Li G.,Huazhong University of Science and Technology | Li G.,National Engineering Research Center for Laser Processing | And 4 more authors.
Optical Engineering | Year: 2011

A positive branch unstable-waveguide hybrid resonator has been designed for a RF-excited slab CO 2 laser of 100W level. The output beam mode and the propagation characteristics in the two directions of unstable and waveguide were investigated by numerical and experimental methods. The results show that the output beam was collimated in the unstable direction, and was an approximate fundamental mode in the waveguide direction with a divergence angle of 12mrad. The output power decreased by 50% with the misaligned angle of the tail mirror of 1.5 mrad, and was close to 0 with the misaligned angle more than 3 mrad. © 2011 Society of Photo-Optical Instrumentation Engineers (SPIE).


Huang Y.,Huazhong University of Science and Technology | Huang Y.,National Engineering Research Center for Laser Processing | Zhu G.,Huazhong University of Science and Technology | Zhu G.,National Engineering Research Center for Laser Processing | And 2 more authors.
Advanced Solid State Lasers, ASSL 2014 | Year: 2014

We present a multi-pass pumping thin-disk laser based on conjugate relation of dual parabolic mirrors. Assembling errors of dual parabolic mirrors won't cause any misregistration of each pumping spot, ensuring a good anti-disturbance stability. © OSA 2014.


Wang W.,Huazhong University of Science and Technology | Wang W.,National Engineering Research Center for Laser Processing | Zhu X.,Huazhong University of Science and Technology | Zhu X.,National Engineering Research Center for Laser Processing
Advanced Solid State Lasers, ASSL 2014 | Year: 2014

The effect of high peak power combined with big pulse energy on laser drilling is investigated experimentally, and compared with the efficiency and quality of drilling using single ms pulses. © OSA 2014.


Wang M.,Huazhong University of Science and Technology | Wang M.,National Engineering Research Center for Laser Processing | Zhu G.,Huazhong University of Science and Technology | Zhu G.,National Engineering Research Center for Laser Processing | And 6 more authors.
Advanced Solid State Lasers, ASSL 2014 | Year: 2014

By numerical analysis, when packing laser disk crystal, using the Copper tungsten CuW75 which contain 25% mass fraction copper as the heatsink and gold-tin eutectic solder layer of greater than 50um thickness, the residual stress of solder layer after soldering process will be below tensile strength. In such a configuration, packing disk active laser gain mirror can increase the yield ratio. © OSA 2014.

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