Impact of forced convective heat transfer on temperature uniformity and frequency doubling efficiency in large aperture ammonium dihydrogen phosphate (ADP) crystals

Sun, Fuzhong; Sun, Dianfu; Ren, Feifan; Fu, Guoyu; Wang, Kang; Zhang, Zhenhua

doi:10.1016/j.optlastec.2023.110348

Cited by 2 publications

(1 citation statement)

References 31 publications

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“…As an improvement, we substituted a water bath with an external circulating water system for the hydrocooling operation. The external circulating water system can improve the convective heat transfer efficiency; 33 it is possible to increase the range of power exerted by the AMF during the reaction system while ensuring a suitable solution temperature. Meanwhile, the heat exchange between external circulating water and the reaction system can be more precisely controlled by regulating the speed of the peristaltic pump.…”

Section: ■ Introductionmentioning

confidence: 99%

Polyhedral Magnetic Nanoparticles of High Magnetization Synthesized by Hydrocooling and Magnetically Internal Heating Coprecipitation: Implications for Magnetic Resonance Imaging

Zhang,

Deng,

Yao

et al. 2024

ACS Appl. Nano Mater.

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The coprecipitation method is widely recognized as a green, biocompatible, and low-cost synthetic pathway. However, the conventional coprecipitation approach used for generating iron oxide nanoparticles (IONPs) yields particles with inadequate crystallinity and magnetism and challenges in controlling their morphology. These limitations restrict the potential uses of IONPs in magnetic resonance imaging (MRI). This study introduces a technique called hydrocooling and magnetically internal heating coprecipitation (HMIHC) to address these limitations and enhance the MRI performance of IONPs. The introduction of an alternating magnetic field (AMF) accelerates the self-ripening process of IONPs and facilitates an ordered arrangement of magnetic moments within the IONPs. Simultaneously, precise control over the phase change is achieved by gradually introducing a NaOH solution, leading to the synthesis of polyhedral IONPs. The polyhedral IONPs produced via HMIHC exhibit extraordinary magnetism and a high r 2 value, and these IONPs exhibit excellent MRI capabilities. This research reveals the significant potential of HMIHC in the production of magnetic nanomaterials for MRI.

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Section: ■ Introductionmentioning

confidence: 99%

Polyhedral Magnetic Nanoparticles of High Magnetization Synthesized by Hydrocooling and Magnetically Internal Heating Coprecipitation: Implications for Magnetic Resonance Imaging

Zhang,

Deng,

Yao

et al. 2024

ACS Appl. Nano Mater.

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45 W average-power, high-energy deep-UV generation at 257 nm in LBO

Mennerat,

Bizet,

Mahieu

et al. 2024

Nonlinear Frequency Generation and Conversion: Materials and Devices XXIII

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We report on high average-power, high-energy picosecond fourth-harmonic generation in LBO. The first stages of a Yb:YAG laser chain operating at 1 kHz repetition rate generate few-picosecond 220 mJ chirped pulses at 1030 nm fundamental wavelength. They are frequency-converted in a cascade of three LBO crystals to generate the second-, third-, and fourth-harmonics at 515 nm, 343 nm and 257 nm respectively. Crystals thicknesses and angular phase-matching detuning were calculated as a function of pulse duration through broadband nonlinear optical numerical simulations. Last crystal is both conduction-cooled on edge and surface-cooled at center through forced-air flow to mitigate heating due to nonlinear absorption in the deep-UV and reduce temperature gradients. Chirped-pulse duration was experimentally adjusted to achieve stable 20% overall conversion efficiency. Near-field beam profiles were continuously recorded at 10 Hz, for all four wavelengths involved, together with corresponding energies, showing no significant beam degradation over 50 hours. Temperatures of the two last crystals were monitored, and will help optimize surface cooling for future power ramping-up.

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Impact of forced convective heat transfer on temperature uniformity and frequency doubling efficiency in large aperture ammonium dihydrogen phosphate (ADP) crystals

Cited by 2 publications

References 31 publications

Polyhedral Magnetic Nanoparticles of High Magnetization Synthesized by Hydrocooling and Magnetically Internal Heating Coprecipitation: Implications for Magnetic Resonance Imaging

Polyhedral Magnetic Nanoparticles of High Magnetization Synthesized by Hydrocooling and Magnetically Internal Heating Coprecipitation: Implications for Magnetic Resonance Imaging

45 W average-power, high-energy deep-UV generation at 257 nm in LBO

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