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).

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).

Electron microscopic characterization of diamond thin films and substrates for diamond heteroepitaxial growth

1989 ◽  
Vol 47 ◽  
pp. 592-593
Author(s):  
J.B. Posthill ◽  
R.P. Burns ◽  
R.A. Rudder ◽  
Y.H. Lee ◽  
R.J. Markunas ◽  
...  
Keyword(s):  
Thin Films ◽  
Wide Band ◽  
Deposition Process ◽  
Heteroepitaxial Growth ◽  
Electron Microscopic ◽  
Wide Band Gap ◽  
Lattice Matching ◽  
Different Types ◽  
Diamond Thin Films

Because of diamond’s wide band gap, high thermal conductivity, high breakdown voltage and high radiation resistance, there is a growing interest in developing diamond-based devices for several new and demanding electronic applications. In developing this technology, there are several new challenges to be overcome. Much of our effort has been directed at developing a diamond deposition process that will permit controlled, epitaxial growth. Also, because of cost and size considerations, it is mandatory that a non-native substrate be developed for heteroepitaxial nucleation and growth of diamond thin films. To this end, we are currently investigating the use of Ni single crystals on which different types of epitaxial metals are grown by molecular beam epitaxy (MBE) for lattice matching to diamond as well as surface chemistry modification. This contribution reports briefly on our microscopic observations that are integral to these endeavors.

scholarly journals High laser induced damage threshold photoresists for nano-imprint and 3D multi-photon lithography

Nanophotonics ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Elmina Kabouraki ◽  
Vasileia Melissinaki ◽  
Amit Yadav ◽  
Andrius Melninkaitis ◽  
Konstantina Tourlouki ◽  
...  
Keyword(s):  
Nanoimprint Lithography ◽  
Three Dimensional ◽  
Damage Threshold ◽  
Laser Pulses ◽  
Intense Laser ◽  
Optical Elements ◽  
Photonic Circuits ◽  
Future Production ◽  
Intense Laser Pulses ◽  
Laser Induced Damage

Abstract Optics manufacturing technology is predicted to play a major role in the future production of integrated photonic circuits. One of the major drawbacks in the realization of photonic circuits is the damage of optical materials by intense laser pulses. Here, we report on the preparation of a series of organic–inorganic hybrid photoresists that exhibit enhanced laser-induced damage threshold. These photoresists showed to be candidates for the fabrication of micro-optical elements (MOEs) using three-dimensional multiphoton lithography. Moreover, they demonstrate pattern ability by nanoimprint lithography, making them suitable for future mass production of MOEs.

A perfectly oriented, free-standing and transparent titania nanosheet film with the band gap of a monolayer

2020 ◽  
Vol 56 (68) ◽  
pp. 9811-9814
Author(s):  
Keisuke Awaya ◽  
Shintaro Ida
Keyword(s):  
Band Gap ◽  
Spin Coating ◽  
Wide Band ◽  
Spin Coating Technique ◽  
Free Standing ◽  
Wide Band Gap ◽  
Coating Technique

A perfectly oriented transparent, free-standing titania nanosheet film prepared using the spin-coating technique showed a wide band gap that corresponded to that of the monolayer nanosheet despite the stacking of hundreds of layers.

scholarly journals Laser-Induced Point Defects in Fused Silica Irradiated by UV Laser in Vacuum

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Xiaoyan Zhou ◽  
Xinda Zhou ◽  
Jin Huang ◽  
Qiang Cheng ◽  
Fengrui Wang ◽  
...  
Keyword(s):  
Point Defects ◽  
Fluorescence Spectra ◽  
Uv Spectroscopy ◽  
Damage Threshold ◽  
Laser Pulses ◽  
Fused Silica ◽  
Third Harmonic ◽  
Structural Modifications ◽  
Laser Induced Damage ◽  
Induced Defects

High-purity fused silica irradiated by third harmonic of the Nd:YAG laser in vacuum with different laser pulse parameters was studied experimentally. Laser-induced defects are investigated by UV spectroscopy, and fluorescence spectra and correlated to the structural modifications in the glass matrix through Raman spectroscopy. Results show that, for laser fluence below laser-induced damage threshold (LIDT), the absorbance and intensity of fluorescence bands increase with laser energies and/or number of laser pulses, which indicates that laser-induced defects are enhanced by laser energies and/or number of laser pulses in vacuum. The optical properties of these point defects were discussed in detail.

Recent advances in free-standing single crystalline wide band-gap semiconductors and their applications: GaN, SiC, ZnO, β-Ga2O3, and diamond

2017 ◽  
Vol 5 (33) ◽  
pp. 8338-8354 ◽  
Author(s):  
Munho Kim ◽  
Jung-Hun Seo ◽  
Uttam Singisetti ◽  
Zhenqiang Ma
Keyword(s):  
Band Gap ◽  
Wide Band ◽  
Free Standing ◽  
Wide Band Gap ◽  
Single Crystalline ◽  
Crystalline Semiconductor ◽  
Recent Advances ◽  
Wide Band Gap Semiconductors

Free-standing single crystalline semiconductor membranes have gained intensive attention over the last few years due to their versatile usage in many applications.

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