A precision crystal phase-matching angle metrology instrument

Pei, Guoqing; Du, Weidong; Lang, Ye; Xu, Xu

doi:10.1016/j.optlastec.2019.01.007

Cited by 8 publications

(3 citation statements)

References 11 publications

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“…This measures the optimal phase-matching angle at each point of the crystal and takes the average as a way of reducing the effects of the crystal’s refractive index non-uniformity and the inconsistency of processed shapes [ 17 ]. The Crystal Phase-matching angle Metrology Instrument (CPMI), designed by Pei et al from the Laser Fusion Research Center of the Chinese Academy of Engineering Physics (CAEP) in 2018, used an Nd: YLF laser as the light source and reflected the first-instrumented laser light into the crystal for phase-matching angle measurements through a mirror fixed to a combined X - Z displacement stage, and controlled the stage to change the scanning position as a means of measuring the phase-matching distributions of the crystal at various points [ 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

A Novel Method for Precision Measurement and Result Optimization of Detuning Angle for KDP Crystals

Wu,

Pei,

Chu

et al. 2024

Sensors

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In this paper, we investigate the theory of energy distribution when divergent light undergoes harmonic conversion in KDP crystals, and based on this theory, we design and construct a precision measuring instrument for the detuning angle of (KDP) Crystals (MIDC). The device can obtain the detuning angle of the crystal by a single measurement with an average measurement error of 72.78 urad. At the same time, it also has the function of scanning the full aperture of the crystals. Using the MIDC, it is possible to quickly measure the KDP crystal at a single point and quickly scan the crystal detuning angle at full aperture. In addition, we conduct a theoretical study on the variation of detuning angle caused by gravity-influencing factors under online conditions, propose an optimization formula for the offline measurement results of detuning angle, and calculate the optimized values of detuning angle for two kinds of crystals under 45° online conditions. We finally study the error source of the MIDC device, analyze the trend of the influence of positioning errors of the crystal and optical elements on the detuning angle measurement results, and provide theoretical support for the error monitoring and correction of MIDC.

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Section: Introductionmentioning

confidence: 99%

A Novel Method for Precision Measurement and Result Optimization of Detuning Angle for KDP Crystals

Wu,

Pei,

Chu

et al. 2024

Sensors

Self Cite

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“…For the 410 mm×410 mm caliber KDP and dKDP crystals used in China’s high-power laser facilities, to obtain accurate detuning angle distribution data, it is necessary to measure the detuning angles of 20×20 or even 40×40 points, which is a very large work quantity. Existing detuning angle measurement systems, such as National Ignition Facility’s crystal alignment verification equipment system 19 , 20 and China’s crystal phase-matching angle metrology instrument, 21 , 22 use a laser ray to generate the second-harmonic laser and vary the KDP crystal’s pitch angle until the intensity of the second-harmonic laser reaches the maximum, and this angle is the detuning angle. This method strictly follows the definition of the detuning angle, and the results of a single measurement point are more accurate.…”

Section: Introductionmentioning

confidence: 99%

Measuring the detuning angles of potassium dihydrogen phosphate crystals using a large divergence angle beam

Chu,

Wang,

Liu

et al. 2023

Opt. Eng.

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.Measuring the detuning angle distribution within the full aperture of a large-aperture potassium dihydrogen phosphate (KDP) crystal is of great engineering importance for improving its frequency conversion efficiency. To improve the measurement speed of the crystal detuning angle, we propose a measurement method based on a flattened Gaussian beam with a large divergence angle. Theoretical simulation shows that the detuning angle of the KDP crystal is linearly related to the vertical position of the maximum light intensity of the second-harmonic laser when using this method. Experimental results confirm our theoretical analysis and show a relative measurement error of 1.32%, which meet the requirements of engineering applications. This measurement method saves 96% of the measurement time of the detuning angle of a single point within the aperture of the KDP crystal, enabling us to measure more points in a limited time, thus improving the measurement accuracy of the detuning angles over the full aperture of the KDP crystals.

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“…Usually, the detuning angle is measured by a laser ray [12,13] . The ray is incident from the laser and passes through KDP and KD*P crystals in turn.…”

Section: Introductionmentioning

confidence: 99%

A fast measurement method of detuning angles of laser frequency converter

Chu

Liu

Tian

et al. 2022

Seventeenth National Conference on Laser Technology and Optoelectronics

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A frequency converter is usually used in high-power laser facilities to triple the frequency of the incident laser. It consists of a KDP crystal and a KD*P crystal in series. The measurement of the detuning angles of the frequency converter is essential for improving the frequency conversion efficiency. In this paper, we propose a measurement method that uses a diverging beam to illuminate the frequency converter and get the detuning angles by analyzing the light intensity distribution of the third harmonic laser. The simulated results show that there is a strict linear relationship between the characteristic parameters and the detuning angles of frequency converter, verifying the feasibility of this method. Compared with existing measurement methods, its optical path is simple, and the single measurement time can be shortened to a few minutes from a few hours.

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A precision crystal phase-matching angle metrology instrument

Cited by 8 publications

References 11 publications

A Novel Method for Precision Measurement and Result Optimization of Detuning Angle for KDP Crystals

A Novel Method for Precision Measurement and Result Optimization of Detuning Angle for KDP Crystals

Measuring the detuning angles of potassium dihydrogen phosphate crystals using a large divergence angle beam

A fast measurement method of detuning angles of laser frequency converter

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