scholarly journals A Compact Accelerator-Based Light Source for High-Power, Full-Bandwidth Tunable Coherent THz Generation

2021 ◽  
Vol 11 (24) ◽  
pp. 11850
Author(s):  
Kaiqing Zhang ◽  
Yin Kang ◽  
Tao Liu ◽  
Zhen Wang ◽  
Chao Feng ◽  
...  
Keyword(s):  
Light Source ◽  
High Power ◽  
Pulse Energy ◽  
Three Dimensional ◽  
Thz Radiation ◽  
Time Resolved ◽  
Narrow Bandwidth ◽  
Radiation Sources ◽  
High Pulse ◽  
Tunable Frequency

Terahertz (THz) radiation sources are increasingly significant for many scientific frontiers, while the generation of THz radiation with high-power at wide-tunable frequencies is still a limitation for most existing methods. In this paper, a compact accelerator-based light source is proposed to produce coherent THz radiation with high pulse energy and tunable frequency from 0.1 THz to 60 THz. By using a frequency beating laser-modulated electron beam and undulator taper, intense coherent THz radiation can be generated through undulators. Theoretical analysis and numerical simulations demonstrate that the proposed technique can generate narrow-bandwidth THz radiation with a pulse energy up to 6.3 millijoule (mJ) and the three-dimensional effects of beam has limited influence on its performance. The proposed technique will open up new opportunities for THz spectroscopic and time-resolved experiments.

Mode-locked thulium-doped fiber laser with a narrow bandwidth and high pulse energy

2012 ◽  
Vol 9 (8) ◽  
pp. 587-590 ◽  
Author(s):  
W Zhou ◽  
D Y Shen ◽  
Y S Wang ◽  
J Y Long ◽  
Y An
Keyword(s):  
Fiber Laser ◽  
Pulse Energy ◽  
High Pulse Energy ◽  
Narrow Bandwidth ◽  
High Pulse

scholarly journals Compact, high-pulse-energy, high-power, picosecond master oscillator power amplifier

2014 ◽  
Vol 22 (18) ◽  
pp. 21938 ◽  
Author(s):  
Ho-Yin Chan ◽  
Shaif-ul Alam ◽  
Lin Xu ◽  
James Bateman ◽  
David J. Richardson ◽  
...  
Keyword(s):  
Power Amplifier ◽  
High Power ◽  
Pulse Energy ◽  
Master Oscillator ◽  
Master Oscillator Power Amplifier ◽  
High Pulse Energy ◽  
High Pulse

scholarly journals Development of High Frequency Gyrotrons and Application to High Power Thz Technologies

2010 ◽  
Vol 5 (4) ◽  
pp. 32-39
Author(s):  
T. Idehara ◽  
T. Saito ◽  
I. Ogawa ◽  
S. Mitsudo ◽  
Y. Tatematsu
Keyword(s):  
High Power ◽  
High Frequency ◽  
Thz Radiation ◽  
Radiation Sources

Development of high frequency cw gyrotrons (Gyrotron FU CW Series) as high power THz radiation sources was advanced in FIR FU on the basis of the success in the development and application of the previous Gyrotron FU series [1]. In this paper, we would introduce the development of high frequency gyrotrons in FIR FU and applications to high power THz technologies

scholarly journals ELBE Center for High-Power Radiation Sources

2016 ◽  
Vol 2 ◽  
Author(s):  
Peter Dr. Michel
Keyword(s):  
High Power ◽  
Nuclear Physics ◽  
Thz Radiation ◽  
Linear Electron ◽  
Radiation Sources ◽  
Laser Systems ◽  
Neutron Time ◽  
Γ Rays ◽  
Power Radiation ◽  
High Power Radiation

<p><span style="font-family: Calibri;">In the ELBE Center for High-Power Radiation Sources, the superconducting linear electron accelerator ELBE, serving  two free electron lasers, sources for intense coherent THz radiation, mono-energetic positrons, electrons, γ-rays, a neutron time-of-flight system as well as two synchronized ultra-short pulsed Petawatt laser systems are collocated. The characteristics of these beams make the ELBE center a unique research instrument for a variety of external users in fields ranging from material science over nuclear physics to cancer research, as well as scientists of the Helmholtz-Zentrum Dresden-Rossendorf (HZDR).</span></p>

Radiation of Charge Moving Between Two Planar Periodic Wire Structures

2020 ◽  
Vol 23 (1) ◽  
pp. 66-71
Author(s):  
E. A. Gurnevich ◽  
I. V. Moroz
Keyword(s):  
Angular Distribution ◽  
Charged Particle ◽  
Research And Development ◽  
High Power ◽  
Free Electron ◽  
Radiation Intensity ◽  
Free Electron Lasers ◽  
Radiation Sources ◽  
Power Radiation ◽  
High Power Radiation

The Smith-Purcell radiation of a charged particle moving in a periodic structure is analysed theoretically. The considered structure consists of two planar diffraction gratings with different periods which are formed by parallel conducting wires. The analytical expression for the spectral-angular distribution of radiation is obtained. It is shown that the angular distribution of radiation can be made narrower by using two gratings instead of one, and radiation intensity can be manipulated by parallel relative shift of gratings. The obtained results are of great importance for the research and development of high power radiation sources based on volume free-electron lasers.

Visualization and Manipulation of Molecular Motion in Solid State through Photo-Induced Clusteroluminescence

2019 ◽  
Author(s):  
Haoke Zhang ◽  
Lili Du ◽  
Lin Wang ◽  
Junkai Liu ◽  
Qing Wan ◽  
...  
Keyword(s):  
Quantum Mechanics ◽  
Excited State ◽  
Solid State ◽  
Light Source ◽  
Molecular Motion ◽  
Molecular Machine ◽  
Conjugated Molecules ◽  
Time Resolved ◽  
Packing Structure ◽  
New Strategy

<p>Building molecular machine has long been a dream of scientists as it is expected to revolutionize many aspects of technology and medicine. Implementing the solid-state molecular motion is the prerequisite for a practical molecular machine. However, few works on solid-state molecular motion have been reported and it is almost impossible to “see” the motion even if it happens. Here the light-driven molecular motion in solid state is discovered in two non-conjugated molecules <i>s</i>-DPE and <i>s</i>-DPE-TM, resulting in the formation of excited-state though-space complex (ESTSC). Meanwhile, the newly formed ESTSC generates an abnormal visible emission which is termed as clusteroluminescence. Notably, the original packing structure can recover from ESTSC when the light source is removed. These processes have been confirmed by time-resolved spectroscopy and quantum mechanics calculation. This work provides a new strategy to manipulate and “see” solid-state molecular motion and gains new insights into the mechanistic picture of clusteroluminescence.<br></p>

High Power Red Laser Diode for Projector Light Source

2019 ◽  
pp. 1283
Author(s):  
Masato Hagimoto ◽  
Shintaro Miyamoto ◽  
Yuki Kimura ◽  
Haruki Fukai ◽  
Manabu Hashizume ◽  
...  
Keyword(s):  
Light Source ◽  
Laser Diode ◽  
High Power

scholarly journals Analysis on High-Power Seaport LED Luminaire with Uniform Light Distribution Based on Optimized Lens and Heatsink

2021 ◽  
Vol 11 (9) ◽  
pp. 4035
Author(s):  
Jinsheon Kim ◽  
Jeungmo Kang ◽  
Woojin Jang
Keyword(s):  
Light Source ◽  
High Power ◽  
Heat Dissipation ◽  
Light Emitting Diode ◽  
Light Distribution ◽  
Light Sources ◽  
Led Light ◽  
High Power Led ◽  
Distribution Requirement ◽  
Lighting Application

In the case of light-emitting diode (LED) seaport luminaires, they should be designed in consideration of glare, average illuminance, and overall uniformity. Although it is possible to implement light distribution through auxiliary devices such as reflectors, it means increasing the weight and size of the luminaire, which reduces the feasibility. Considering the special environment of seaport luminaires, which are installed at a height of 30 m or more, it is necessary to reduce the weight of the device, facilitate replacement, and secure a light source with a long life. In this paper, an optimized lens design was investigated to provide uniform light distribution to meet the requirement in the seaport lighting application. Four types of lens were designed and fabricated to verify the uniform light distribution requirement for the seaport lighting application. Using numerical analysis, we optimized the lens that provides the required minimum overall uniformity for the seaport lighting application. A theoretical analysis for the heatsink structure and shape were conducted to reduce the heat from the high-power LED light sources up to 250 W. As a result of these analyses on the heat dissipation characteristics of the high-power LED light source used in the LED seaport luminaire, the heatsink with hexagonal-shape fins shows the best heat dissipation effect. Finally, a prototype LED seaport luminaire with an optimized lens and heat sink was fabricated and tested in a real seaport environment. The light distribution characteristics of this prototype LED seaport luminaire were compared with a commercial high-pressure sodium luminaire and metal halide luminaire.

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