scholarly journals Hf1−xSixO2 Nanocomposite Coatings Prepared by Ion-Assisted Co-Evaporation Process for Low-Loss and High-LIDT Optics

Materials ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2606
Author(s):  
Hongfei Jiao ◽  
Xinshang Niu ◽  
Jinlong Zhang ◽  
Bin Ma ◽  
Xinbin Cheng ◽  
...  
Keyword(s):  
High Performance ◽  
Optical Loss ◽  
Damage Threshold ◽  
Wide Band ◽  
Amorphous Structure ◽  
Evaporation Process ◽  
Low Loss ◽  
Wide Band Gap ◽  
High Laser ◽  
Laser Induced Damage

Hf1−xSixO2 nanocomposites with different SiO2 doping ratios were synthesized using an ion-assisted co-evaporation process to achieve dense amorphous Hf1−xSixO2 coatings with low loss and a high laser-induced damage threshold (LIDT). The results showed that the Hf1−xSixO2 nanocomposites (x ≥ 0.20) exhibited excellent comprehensive performance with a wide band gap and a dense amorphous microstructure. High-temperature annealing was carried out to ensure better stoichiometry and lower absorption. Precipitation and regrowth of HfO2 grains were observed from 400 °C to 600 °C during annealing of the Hf0.80Si0.20O2 nanocomposites, resulting in excessive surface roughness. A phenomenological model was proposed to explain the phenomenon. The Hf1−xSixO2 nanocomposites (x = 0.3 and 0.4) maintained a dense amorphous structure with low absorption after annealing. Finally, a 1064-nm Hf0.70Si0.30O2/SiO2 high-performance reflector was prepared and achieved low optical loss (15.1 ppm) and a high LIDT (67 J/cm2).

scholarly journals Laser-induced damage thresholds of ultrathin targets and their constraint on laser contrast in laser-driven ion acceleration experiments

2020 ◽  
Vol 8 ◽  
Author(s):  
Dahui Wang ◽  
Yinren Shou ◽  
Pengjie Wang ◽  
Jianbo Liu ◽  
Zhusong Mei ◽  
...  
Keyword(s):  
Damage Threshold ◽  
Wide Band ◽  
Laser Pulses ◽  
Laser Damage Threshold ◽  
Single Shot ◽  
Bulk Materials ◽  
Free Standing ◽  
Wide Band Gap ◽  
Different Types ◽  
Laser Induced Damage

Abstract Single-shot laser-induced damage threshold (LIDT) measurements of multi-type free-standing ultrathin foils were performed in a vacuum environment for 800 nm laser pulses with durations τ ranging from 50 fs to 200 ps. The results show that the laser damage threshold fluences (DTFs) of the ultrathin foils are significantly lower than those of corresponding bulk materials. Wide band gap dielectric targets such as SiN and formvar have larger DTFs than semiconductive and conductive targets by 1–3 orders of magnitude depending on the pulse duration. The damage mechanisms for different types of targets are studied. Based on the measurement, the constrain of the LIDTs on the laser contrast is discussed.

Mn-Based tin sulfide Sr3MnSn2S8 with a wide band gap and strong nonlinear optical response

2019 ◽  
Vol 7 (5) ◽  
pp. 1146-1150 ◽  
Author(s):  
Chuang Liu ◽  
Dajiang Mei ◽  
Wangzhu Cao ◽  
Yi Yang ◽  
Yuandong Wu ◽  
...  
Keyword(s):  
Band Gap ◽  
Nonlinear Optical ◽  
Second Harmonic ◽  
Damage Threshold ◽  
Wide Band ◽  
Laser Damage Threshold ◽  
Tin Sulfide ◽  
Nonlinear Optical Material ◽  
Wide Band Gap ◽  
High Laser

The new nonlinear optical material Sr3MnSn2S8 is a noncentrosymmetric structure with a large band gap of 3.02 eV. In addition, Sr3MnSn2S8 possesses a good second harmonic generation (SHG) response, approximately equivalent to that of AgGaS2, and a high laser damage threshold (LDT) about 3 times that of AgGaS2 (AGS).

Preparation of high laser-induced damage threshold sol-gel Nb2O5 films with different additives

Optik ◽  
2020 ◽  
Vol 206 ◽  
pp. 164306 ◽  
Author(s):  
Wenzhe Cai ◽  
Yingtian Yang ◽  
Yongqiao Zhu ◽  
Dawei Li ◽  
Cheng Xu
Keyword(s):  
Sol Gel ◽  
Damage Threshold ◽  
High Laser ◽  
Laser Induced Damage

Layer-dependent photocatalysts of GaN/SiC-based multilayer van der Waals heterojunctions for Hydrogen Evolution

2021 ◽  
Author(s):  
Bojun Peng ◽  
Liang Xu ◽  
Jian Zeng ◽  
Xiaopeng Qi ◽  
Youwen Yang ◽  
...  
Keyword(s):  
Band Gap ◽  
Hydrogen Evolution ◽  
High Performance ◽  
Van Der Waals ◽  
Environmentally Friendly ◽  
Wide Band ◽  
Two Dimensional ◽  
Wide Band Gap ◽  
Van Der Waals Heterostructures ◽  
Composite Photocatalysts

The development of non-precious, high-performance and environmentally friendly wide band gap semiconductor composite photocatalysts is highly desirable. Here we report two-dimensional (2D) GaN/SiC-based multilayer van der Waals heterostructures for hydrogen...

NANOSTRUCTURAL PROPERTIES OF La2O3/HfO2 GATE DIELECTRICS

2012 ◽  
Vol 26 (14) ◽  
pp. 1250080 ◽  
Author(s):  
A. BAHARI ◽  
A. RAMZANNEJAD
Keyword(s):  
Gate Dielectric ◽  
Gate Dielectrics ◽  
Wide Band ◽  
Amorphous Structure ◽  
Boron Diffusion ◽  
Wide Band Gap ◽  
Good Thermal Stability ◽  
Force Microscopy ◽  
Alternative Material ◽  
High Dielectric

There are some issues such as tunneling, leakage currents and boron diffusion through the ultra thin SiO 2 which are threatening ultra thin SiO 2 dielectric as a good gate dielectric. A very obvious alternative material is HfO 2, due to its high dielectric constant, wide band gap and good thermal stability on silicon substrate. We have thus demonstrated a number of processes to synthesize La 2 O 3/ HfO 2 and studied its nano structural properties with using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and atomic force microscopy (AFM) techniques. The obtained results show that La 2 O 3/ HfO 2 (at 500°C with amorphous structure) can be introduced as a good gate dielectric for the future of complementary metal insulator semiconductor (CMIS) device.

Preparation of high laser-induced damage threshold Ta2O5 films

2014 ◽  
Vol 309 ◽  
pp. 194-199 ◽  
Author(s):  
Cheng Xu ◽  
Peng Yi ◽  
Heliang Fan ◽  
Jianwei Qi ◽  
Shuai Yang ◽  
...  
Keyword(s):  
Damage Threshold ◽  
High Laser ◽  
Laser Induced Damage
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