Optomechanical analysis and performance optimization of large-aperture KDP frequency converter

Zhang, Zheng; Wang, Hui; Quan, Xusong; Pei, Guoqing; Tian, Mingzhen; Liu, Tianye; Long, Kai; Li, Pengda; Ye, Rong

doi:10.1016/j.optlastec.2018.08.053

Cited by 15 publications

(5 citation statements)

References 23 publications

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“…The dynamic cutting forces between the cutting tool and workpiece induce their dynamic displacements. According to the mass, damping, and stiffness of the cutting tool and workpiece system, the whole machining system can be described as the functions of the dynamic cutting forces in the X, Y, and Z directions, and shown as (1) where mat and maw (a = x,y,z) are the equivalent mass of the cutting tool and workpiece in the X, Y, and Z directions; cat and caw (a = x,y,z) are the equivalent damping of the cutting tool and workpiece in the X, Y, and Z directions; kat and kaw (a = x,y,z) are the equivalent stiffness of the cutting tool and workpiece in the X, Y, and Z directions; xt, yt, and zt are the dynamic displacements of the cutting tool in the X, Y, and Z directions, respectively; xw, yw, and zw are the dynamic displacements of the workpiece in the X, Y, and Z directions, respectively; and Fx, Fy, and Fz are the dynamic cutting forces in the X, Y, and Z directions. The Simulink (version 2012a) model of the dynamic cutting forces is shown in Figure 4.…”

Section: Simulation Modelsmentioning

confidence: 99%

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Prediction Model of Three-Dimensional Machined Potassium Dihydrogen Phosphate Surfaces Based on a Dynamic Response Machining System

Pang

Xiong

2022

Materials

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To comprehensively obtain the effect of the machining process on the three-dimensional surface topography of machined potassium dihydrogen phosphate crystals, a dynamic response model of a machining system was built to calculate the dynamic displacement variables in the different processing directions. This model includes almost all processing factors, such as cutting parameters, environment vibration, radial and axial runout of the spindle, cutting tool parameters, material parameters, guide way error, fast tool servo and lubrication condition errors, etc. Compared with the experimental results, the three-dimensional topographies and two-dimensional profiles of the simulation surfaces were nearly consistent with those of experimental machined surfaces. As the simulation shows, the cutting parameters, axial runout of the spindle, and the output noise of the fast tool servo can respectively impact the main, low, and high frequencies of the machined surface topography. The main frequency of all the simulated and experimental surfaces in this study was 0.0138 μm−1. The low and high frequencies of the simulation surfaces had slight differences, about 0.003 μm−1 from those of the experimental surfaces. The simulation model, based on dynamic response, can accurately predict the entire machining process and three-dimensional topographies of machined potassium dihydrogen phosphate surfaces.

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Section: Simulation Modelsmentioning

confidence: 99%

“…In the fields of high-power laser systems and inertial confinement fusion, potassium dihydrogen phosphate (KH2PO4, KDP) crystal is widely used as the key material for nonlinear frequency-doubled components [1,2]. Machined KDP surface topographies can impact the optical performance of KDP components [3,4].…”

Section: Introductionmentioning

confidence: 99%

Prediction Model of Three-Dimensional Machined Potassium Dihydrogen Phosphate Surfaces Based on a Dynamic Response Machining System

Pang

Xiong

2022

Materials

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“…Potassium dihydrogen phosphate (KH 2 PO 4 and KDP) crystals have excellent nonlinear electro-optical properties and currently constitute the only material that can be used as electro-optical switching and frequency doubling conversion elements in laser-induced inertial confinement fusion (ICF) technology [1]. High-power ICF laser devices require a high number of large-size, ultra-high-quality KDP crystal elements.…”

Section: Introductionmentioning

confidence: 99%

Effect of Wetting Characteristics of Polishing Fluid on the Quality of Water-Dissolution Polishing of KDP Crystals

et al. 2022

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KDP crystals constitute the only laser-frequency conversion and electro-optical switches that can be used in laser systems for inertial confinement fusion. However, KDP crystals are difficult to produce because of their inherent softness, brittleness, water-solubility, and temperature sensitivity. The authors’ group developed a water-dissolution polishing method in previous studies to obtain near-damage-free KDP surfaces. In this article, the effect of the wetting characteristics of the water dissolution polishing fluid on the crystal surface—a factor rarely considered in the usual process optimization—on the polished surface quality was comprehensively studied. The mean radius of micro water droplets at 5 wt.% and 7.5 wt.% water content was approximately 0.6 nm and 1.2 nm, respectively. Theoretically, the smaller micro water droplet size is beneficial to the polished surface quality. When the water content was 5 wt.%, due to the poor wetting characteristics of the polishing fluid, surface scratches appeared on the polished surface; when the water content was 7.5 wt.%, the effects of the wetting characteristics and the radius of the micro water droplets reached a balance, and the polished surface quality was the best (Ra 1.260 nm). These results confirm that the wetting characteristics of the polishing fluid constitute one of the key factors that must be considered. This study proves that the wetting characteristics of the polishing fluid should be improved during the optimization process of polishing fluid composition when using oil-based polishing fluids for ultra-precision polishing.

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“…Potassium dihydrogen phosphate (KH 2 PO 4 , KDP) crystals are nonlinear, optical crystals [ 1 ] that are widely used as frequency-doubled components in high-power laser systems and inertial confinement fusion due to their superior optical performance [ 2 ]. Various factors can affect the 3D surface topography of machined KDP crystal surfaces in the machining process, such as machining conditions and tool parameters [ 3 ].…”

Section: Introductionmentioning

confidence: 99%

Extraction and Reconstruction of Arbitrary 3D Frequency Features from the Potassium Dihydrogen Phosphate Surfaces Machined by Different Cutting Parameters

Pang

Shu²,

2022

Materials

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To comprehensively analyze the effect of cutting parameters on the 3D surface topography of machined potassium dihydrogen phosphate crystals, 2D power spectrum density and continuous wavelet transform are used to extract and reconstruct the arbitrary actual 3D frequency features of machined potassium dihydrogen phosphate crystal surfaces. The 2D power spectrum density method is used to quantitatively describe the 3D surface topography of machined potassium dihydrogen phosphate crystals. The continuous wavelet transform method is applied to extract and reconstruct 3D topographies of arbitrary actual spatial frequency features in machined surfaces. The main spatial frequency features fx of the machined surfaces are 0.0056 μm−1, 0.0112 μm−1, and 0.0277 μm−1 with the cutting depth from 3 μm to 9 μm. With the feed rate changing from 8μm/r to 18 μm/r, the main spatial frequency features fx are 0.0056 μm−1–0.0277 μm−1. With the spindle speed from 1300 r/min to 1500 r/min, the main spatial frequency features fx are same as the main spatial frequency features of the cutting depths. The results indicate that the variation of cutting parameters affects the main spatial frequency features on the 3D surface topography. The amplitudes of the spatial middle-frequency features are increased with the increasing of cutting depth and spindle speed. The spatial low-frequency features are mainly affected via the feed rate. The spatial high-frequency features are related to the measurement noise and material properties of potassium dihydrogen phosphate. The distributional directions of the frequency features in the reconstructed 3D surface topography are consistent with the distribution directions of actual frequency features in the original surface topography. The reconstructed topographies of the spatial frequency features with maximum power spectrum density are the most similar to the original 3D surfaces. In this machining, the best 3D surface topography of the machined KDP crystals is obtained with a cutting depth ap = 3 μm, feed rate f = 8 μm/r and a spindle speed n = 1400 r/min.

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Optomechanical analysis and performance optimization of large-aperture KDP frequency converter

Cited by 15 publications

References 23 publications

Prediction Model of Three-Dimensional Machined Potassium Dihydrogen Phosphate Surfaces Based on a Dynamic Response Machining System

Prediction Model of Three-Dimensional Machined Potassium Dihydrogen Phosphate Surfaces Based on a Dynamic Response Machining System

Effect of Wetting Characteristics of Polishing Fluid on the Quality of Water-Dissolution Polishing of KDP Crystals

Extraction and Reconstruction of Arbitrary 3D Frequency Features from the Potassium Dihydrogen Phosphate Surfaces Machined by Different Cutting Parameters

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