Huamin Kou
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View article: Investigation of the Damage Characteristics and Mechanisms in Silicon Carbide Crystals Induced by Nanosecond Pulsed Lasers at the Fundamental Frequency
Investigation of the Damage Characteristics and Mechanisms in Silicon Carbide Crystals Induced by Nanosecond Pulsed Lasers at the Fundamental Frequency Open
Silicon carbide (SiC) single crystals are extensively utilized in various fields due to their exceptional properties, such as a wide bandgap and a high breakdown threshold. Nevertheless, the intrinsic high hardness of SiC creates significa…
View article: Mechanism of Tailoring Laser-Induced Periodic Surface Structures on 4H-SiC Crystal Using Ultrashort-Pulse Laser
Mechanism of Tailoring Laser-Induced Periodic Surface Structures on 4H-SiC Crystal Using Ultrashort-Pulse Laser Open
In this study, we examine the characteristics of laser-induced periodic surface structures (LIPSSs) fabricated on N-doped 4H-SiC (N-SiC) and high-purity 4H-SiC (HP-SiC) crystals using femtosecond–picosecond lasers. The effects of various l…
View article: Ablation and carbonization effects of femtosecond-picosecond pulsed laser processing on different 4H-SiC materials
Ablation and carbonization effects of femtosecond-picosecond pulsed laser processing on different 4H-SiC materials Open
Ultra-short pulsed lasers are critical for the precision machining of silicon carbide (SiC) due to their non-thermal processing capabilities. This paper investigates the processing characteristics of ultra-short pulsed lasers with non-ther…
View article: Thermo-mechanical properties and laser-induced damage behaviors in NYCF and NYSF crystals with different orientations
Thermo-mechanical properties and laser-induced damage behaviors in NYCF and NYSF crystals with different orientations Open
Nd,Y:CaF2 (NYCF) and Nd,Y:SrF2 (NYSF) crystals are excellent types of laser gain media owing to their enhanced absorption-emission cross sections and fluorescence lifetimes, and high thermal conductivity. In this study, the laser damage be…
View article: Characteristics of Fused Silica Exit Surface Damage by Low-Temporal Coherence Light Irradiation
Characteristics of Fused Silica Exit Surface Damage by Low-Temporal Coherence Light Irradiation Open
Laser-induced exit surface damage of fused silica is a key bottleneck for its application in high-power laser devices. As low-temporal coherence light (LTCL) has garnered increasing attention for high-power laser-driven inertial confinemen…
View article: Impact of internal defects on laser-induced damage in Nd<sup>3+</sup>, Gd<sup>3+</sup> co-doped SrF<sub>2</sub> crystals
Impact of internal defects on laser-induced damage in Nd<sup>3+</sup>, Gd<sup>3+</sup> co-doped SrF<sub>2</sub> crystals Open
The comprehensive investigation into the distribution characteristics of internal defects across various growth areas of Nd, Gd: SrF 2 (NGSF) crystals is presented in this paper by photothermal weak absorption, stress-induced birefringence…
View article: Revealing the atomic-scale structures of dislocations in calcium fluoride single crystal
Revealing the atomic-scale structures of dislocations in calcium fluoride single crystal Open
Dislocations are ubiquitous in crystalline solids and play a critical role in both material properties and device performance. Due to the numerous variables influencing crystal growth, such as temperature, pressure, and impurity levels, th…
View article: Electron paramagnetic resonance and photoluminescence study on local structure of Gd <sup>3+</sup> ions in Gd-doped CaF <sub>2</sub> crystals
Electron paramagnetic resonance and photoluminescence study on local structure of Gd <sup>3+</sup> ions in Gd-doped CaF <sub>2</sub> crystals Open
The EPR spectra of CaF 2 with different Gd-doping concentrations were fitted, combined calculations revealed that most of the Gd 3+ in 1.22 at% Gd:CaF 2 are distributed as a dimer with a distance of 7.7 Å distributed along the [110] direct…
View article: Insight into neodymium clusters and spectroscopic properties in CaF<sub>2</sub> single crystals
Insight into neodymium clusters and spectroscopic properties in CaF<sub>2</sub> single crystals Open
In this work, the relationship between local structures and the photoluminescence parameters of neodymium activated fluorite crystals has been preliminary investigated in CaF 2 crystals. The first principles calculation results reveal that…
View article: Investigation on Growth and Anisotropic Charge Lifetime of BiVO<sub>4</sub> Crystal
Investigation on Growth and Anisotropic Charge Lifetime of BiVO<sub>4</sub> Crystal Open
Centimeter‐sized monoclinic BiVO 4 (BVO) crystals are successfully grown by Bridgman method, and the physical and chemical properties of their exposed crystal surfaces have been studied. It is found that the atomic alignment and atomic den…
View article: Irradiation Damage of CaF<sub>2</sub> with Different Yttrium Concentrations under 193 nm Laser
Irradiation Damage of CaF<sub>2</sub> with Different Yttrium Concentrations under 193 nm Laser Open
Radiation resistance of CaF 2 crystal is one of the critical properties in the application of deep ultraviolet lithography, but the damage process under 193 nm laser irradiation is still unclear.This paper reports the damage behavior of Ca…
View article: Research Progress of Pr<sup>3+</sup> Activated Laser Crystals in Visible Region
Research Progress of Pr<sup>3+</sup> Activated Laser Crystals in Visible Region Open
：Laser emission in visible spectral regions has attracted much attention due to a wide variety of domains such as material processing in industry，fluorescence microscopy in research science，wireless optical communication，holography，laser d…
View article: Rare-earth induced nonlinear structural evolutions in fluorite solid solution crystals
Rare-earth induced nonlinear structural evolutions in fluorite solid solution crystals Open
The modification of chemical composition to improve desired material parameters is an effective method in materials science and engineering. In this work, Ca 1-x Sr x F 2 solid solution is chosen as the subject. Nd 3+ and Y 3+ ions are use…
View article: Growth and Characterization of Ce-Doped Luag Single Crystal Fibers from Transparent Ceramics by Laser-Heated Pedestal Method
Growth and Characterization of Ce-Doped Luag Single Crystal Fibers from Transparent Ceramics by Laser-Heated Pedestal Method Open
Scintillation single crystal fibers (SCFs) have great potential applications in the new generation of high-energy ray and particle detectors due to their morphological advantages. In this work; Ce:LuAG SCFs with a diameter of 1 mm were gro…
View article: Effects of doping ions on the luminescence performance of terbium doped gadolinium polysulfide phosphor
Effects of doping ions on the luminescence performance of terbium doped gadolinium polysulfide phosphor Open
Gd 2 O 2 S: Tb (GOS) phosphor screen has been widely used in digital X-ray imaging, and so far, numerous studies have been focused on the doping ions to improve the luminescence performance of the GOS phosphors. GOS: Tb, Dy phosphors were …
View article: Diffusion Characteristics of Cr Dopant in Cr:ZnS Crystals via Laser Ablation– Inductively Coupled Plasma Mass Spectrometry Analysis
Diffusion Characteristics of Cr Dopant in Cr:ZnS Crystals via Laser Ablation– Inductively Coupled Plasma Mass Spectrometry Analysis Open
Laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) was applied to characterize the diffusion behavior of doped Cr ions in ZnS crystals, in terms of Cr concentration, diffusion distribution, and diffusion coefficient.Fo…
View article: Towards Bright and Fast Lu<sub>3</sub>Al<sub>5</sub>O<sub>12</sub>:Ce,Mg Optical Ceramics Scintillators
Towards Bright and Fast Lu<sub>3</sub>Al<sub>5</sub>O<sub>12</sub>:Ce,Mg Optical Ceramics Scintillators Open
The recent advent of Lu 3 Al 5 O 12 :Ce optical ceramics marks a turning point in scintillator material technology. Because of their lower preparation temperature, brightness, and robustness such materials can now compete with single cryst…