scholarly journals Experimental Investigations on Wavefront Distortion of LD-Pumped Neodymium-Doped Silica-Glass Rod with High Thermal Shock Parameter

2020 ◽  
Vol 10 (15) ◽  
pp. 5023
Author(s):  
Long Pan ◽  
Wenfa Huang ◽  
Shikai Wang ◽  
Shengzhe Ji ◽  
Xinghua Lu ◽  
...  
Keyword(s):  
Thermal Shock ◽  
Silica Glass ◽  
High Energy ◽  
Experimental Investigations ◽  
Small Signal ◽  
High Repetition ◽  
Wavefront Distortion ◽  
Shock Parameter ◽  
Material Uniformity

The characterization of a laser diode (LD)-pumped neodymium-doped silica glass (NDSG) laser is here described. The gain performance and wavefront distortion were measured, and the thermal toughness and uniformity distribution of the material were experimentally observed. At a pumping frequency of 1 Hz and energy 7.79 J, a small-signal gain of 1.16 was measured, and the wavefront distortion reached 2.67 λ (wavelength λ = 1053 nm). At a pumping frequency of 25 Hz with 194 W power, the NDSG was still not cracked, which is consistent with its high thermal shock parameter. However, the material uniformity was relatively poor. These results indicate good prospects for the application of NDSG lasers at high energy and high repetition frequency, but the gain performance, uniformity, and other aspects affected by the manufacturing process need to be improved.

40J class laser oscillation of Nd-doped silica glass with high thermal shock parameter

2007 ◽  
Vol 90 (22) ◽  
pp. 221108 ◽  
Author(s):  
Takahiro Sato ◽  
Yasushi Fujimoto ◽  
Hajime Okada ◽  
Hidetsugu Yoshida ◽  
Masahiro Nakatsuka ◽  
...  
Keyword(s):  
Thermal Shock ◽  
Silica Glass ◽  
Laser Oscillation ◽  
Shock Parameter

scholarly journals Scaling diode-pumped, high energy picosecond lasers to kilowatt average powers

2018 ◽  
Vol 6 ◽  
Author(s):  
Brendan A. Reagan ◽  
Cory Baumgarten ◽  
Elzbieta Jankowska ◽  
Han Chi ◽  
Herman Bravo ◽  
...  
Keyword(s):  
Repetition Rate ◽  
Average Power ◽  
High Energy ◽  
High Repetition Rate ◽  
Full Characterization ◽  
High Repetition ◽  
Diode Pumped ◽  
Picosecond Lasers ◽  
Active Mirror

Recent results in the development of diode-driven high energy, high repetition rate, picosecond lasers, including the demonstration of a cryogenic Yb:YAG active mirror amplifier that produces 1.5 J pulses at 500 Hz repetition rate (0.75 kW average power) are reviewed. These pulses are compressed resulting in the generation of ${\sim}5~\text{ps}$ duration, 1 J pulses with 0.5 kW average power. A full characterization of this high power cryogenic amplifier, including at-wavelength interferometry of the active region under ${>}1~\text{kW}$ average power pump conditions, is presented. An initial demonstration of operation at 1 kW average power (1 J, 1 kHz) is reported.

Laser Oscillation of Nd-Doped Silica Glass with High Thermal Shock Parameter

2006 ◽  
Vol 45 (9A) ◽  
pp. 6936-6939 ◽  
Author(s):  
Takahiro Sato ◽  
Yasushi Fujimoto ◽  
Tetsuji Ueda ◽  
Akira Fujinoki ◽  
Hajime Okada ◽  
...  
Keyword(s):  
Thermal Shock ◽  
Silica Glass ◽  
Laser Oscillation ◽  
Shock Parameter

Development of Nd-doped Optical Gain Material Based on Silica Glass with High Thermal Shock Parameter for High-Average-Power Laser

2005 ◽  
Vol 44 (4A) ◽  
pp. 1764-1770 ◽  
Author(s):  
Yasushi Fujimoto ◽  
Hidetsugu Yoshida ◽  
Masahiro Nakatsuka ◽  
Tetsuji Ueda ◽  
Akira Fujinoki
Keyword(s):  
Thermal Shock ◽  
Silica Glass ◽  
Average Power ◽  
Optical Gain ◽  
High Average Power ◽  
Power Laser ◽  
Shock Parameter ◽  
Gain Material

HIGH ENERGY SYNCHROTRON X-RAY MICROSPECTROSCOPY FOR GEOCHEMICAL CHARACTERIZATION OF TERRESTRIAL AND EXTRATERRESTRIAL SAMPLES

2016 ◽  
Author(s):  
Antonio Lanzirotti ◽  
◽  
Stephen R. Sutton ◽  
Matt Newville ◽  
Jeffrey P. Fitts ◽  
...  
Keyword(s):  
High Energy ◽  
Geochemical Characterization ◽  
X Ray

scholarly journals Low-Energy Electron Damage to Condensed-Phase DNA and Its Constituents

2021 ◽  
Vol 22 (15) ◽  
pp. 7879
Author(s):  
Yingxia Gao ◽  
Yi Zheng ◽  
Léon Sanche
Keyword(s):  
Condensed Phase ◽  
Genetic Material ◽  
High Energy ◽  
Dna Lesions ◽  
Low Energy ◽  
Experimental Investigations ◽  
Experimental Conditions ◽  
Strand Breaks ◽  
Sequence Of Events ◽  
Wide Range

The complex physical and chemical reactions between the large number of low-energy (0–30 eV) electrons (LEEs) released by high energy radiation interacting with genetic material can lead to the formation of various DNA lesions such as crosslinks, single strand breaks, base modifications, and cleavage, as well as double strand breaks and other cluster damages. When crosslinks and cluster damages cannot be repaired by the cell, they can cause genetic loss of information, mutations, apoptosis, and promote genomic instability. Through the efforts of many research groups in the past two decades, the study of the interaction between LEEs and DNA under different experimental conditions has unveiled some of the main mechanisms responsible for these damages. In the present review, we focus on experimental investigations in the condensed phase that range from fundamental DNA constituents to oligonucleotides, synthetic duplex DNA, and bacterial (i.e., plasmid) DNA. These targets were irradiated either with LEEs from a monoenergetic-electron or photoelectron source, as sub-monolayer, monolayer, or multilayer films and within clusters or water solutions. Each type of experiment is briefly described, and the observed DNA damages are reported, along with the proposed mechanisms. Defining the role of LEEs within the sequence of events leading to radiobiological lesions contributes to our understanding of the action of radiation on living organisms, over a wide range of initial radiation energies. Applications of the interaction of LEEs with DNA to radiotherapy are briefly summarized.

Sign in / Sign up

Export Citation Format

Share Document