scholarly journals Positive and Negative Symmetric Pulses with Fast Rising Edge Generated from a GaAs Photoconductive Semiconductor Switch

2019 ◽  
Vol 9 (2) ◽  
pp. 358
Author(s):  
Wei Shi ◽  
Lei Yang ◽  
Lei Hou ◽  
Zenan Liu ◽  
Nuo Xu ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Femtosecond Laser ◽  
Femtosecond Laser Pulse ◽  
Pulse Energy ◽  
Streak Camera ◽  
Experimental Results ◽  
Good Stability ◽  
Semiconductor Switch

In this paper, the positive and negative symmetric pulses with a fast rising edge were generated by a GaAs photoconductive semiconductor switch (PCSS). When the GaAs PCSS was biased at 2.0 kV and triggered by a femtosecond laser pulse with a pulse energy of 97.5 J, the peak voltages of the positive and negative pulses were 1.313 kV and 1.329 kV, respectively, and the rise times were 174 ps and 164 ps, respectively. Moreover, the GaAs PCSS presents good stability. The experimental results show that GaAs PCSSs can meet the requirement of a femtosecond streak camera.

scholarly journals Generation of Ultrabroad and Intense Supercontinuum in Mixed Multiple Thin Plates

Photonics ◽  
2021 ◽  
Vol 8 (8) ◽  
pp. 311
Author(s):  
Jing Li ◽  
Wenjiang Tan ◽  
Jinhai Si ◽  
Zhen Kang ◽  
Xun Hou
Keyword(s):  
Laser Pulse ◽  
Femtosecond Laser ◽  
Femtosecond Laser Pulse ◽  
Bulk Material ◽  
Spectral Intensity ◽  
Good Stability ◽  
Thin Plates ◽  
Single Filament ◽  
Potential Applications ◽  
Improved Technique

Supercontinuum (SC) generation using multiple thin plates is demonstrated with a femtosecond laser pulse. We propose an improved technique to obtain larger spectrum broadening and higher spectral intensity by employing mixed multiple thin plates with different thicknesses and materials. Furthermore, the spectrum has good stability, which is superior to that of the spectrum induced by the traditional single filament in bulk material. Our approach offers a route towards simple and stable SC generation for potential applications.

scholarly journals Femtosecond laser pulse energy accumulation optimization effect on surface morphology of black silicon

2017 ◽  
Vol 66 (6) ◽  
pp. 067902
Author(s):  
Tao Hai-Yan ◽  
Chen Rui ◽  
Song Xiao-Wei ◽  
Chen Ya-Nan ◽  
Lin Jing-Quan
Keyword(s):  
Laser Pulse ◽  
Femtosecond Laser ◽  
Surface Morphology ◽  
Femtosecond Laser Pulse ◽  
Pulse Energy ◽  
Laser Pulse Energy ◽  
Black Silicon ◽  
Energy Accumulation

Femtosecond laser pulse energy transfer induced by plasma grating due to filament interaction in air

2010 ◽  
Vol 97 (7) ◽  
pp. 071108 ◽  
Author(s):  
Xuan Yang ◽  
Jian Wu ◽  
Yuqi Tong ◽  
Liang’en Ding ◽  
Zhizhan Xu ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Laser Pulse ◽  
Femtosecond Laser ◽  
Femtosecond Laser Pulse ◽  
Pulse Energy ◽  
Laser Pulse Energy

Femtosecond laser pulse energy self-stabilization

2004 ◽  
Vol 79 (8) ◽  
pp. 933-935 ◽  
Author(s):  
T. Oksenhendler ◽  
F. Legrand ◽  
M. Perdrix ◽  
O. Gobert ◽  
D. Kaplan
Keyword(s):  
Laser Pulse ◽  
Femtosecond Laser ◽  
Femtosecond Laser Pulse ◽  
Pulse Energy ◽  
Laser Pulse Energy ◽  
Self Stabilization

scholarly journals Direct Writing of Cu Patterns on Polydimethylsiloxane Substrates Using Femtosecond Laser Pulse-Induced Reduction of Glyoxylic Acid Copper Complex

Micromachines ◽  
2021 ◽  
Vol 12 (5) ◽  
pp. 493
Author(s):  
Nam Phuong Ha ◽  
Tomoji Ohishi ◽  
Mizue Mizoshiri
Keyword(s):  
Laser Pulse ◽  
Femtosecond Laser ◽  
Femtosecond Laser Pulse ◽  
Pulse Energy ◽  
Glyoxylic Acid ◽  
Numerical Aperture ◽  
Scanning Speed ◽  
Femtosecond Laser Pulses ◽  
Direct Writing ◽  
Glass Substrates

We investigate the direct writing properties of copper (Cu) patterns on glass and polydimethylsiloxane (PDMS) substrates using femtosecond laser pulse-induced thermochemical reduction of glyoxylic acid copper (GACu) complex. The films of the GACu complex coated on the substrates were irradiated by focused femtosecond laser pulses using a low numerical aperture of 0.45. Under the same conditions, such as laser scanning speed and pulse energy, the width of the line patterns fabricated on PDMS substrates was larger than that on glass substrates. X-ray diffraction peaks of the patterns on glass substrates corresponded to Cu without significant oxidation. By contrast, although Cu patterns were fabricated on PDMS substrates at a scanning speed of 10 mm/s and pulse energy of 0.49 nJ, Cu2O was also generated under overheating conditions at a scanning speed of 1 mm/s and pulse energy of 0.37 nJ. All the patterns exhibited electrical conductivity. The minimum resistivity of the patterns on PDMS substrates is 1.4 × 10−5 Ωm, which is 10 times higher than that on glass substrates, indicating that microcracks formed by thermal shrinkage of the substrates during the laser irradiation increase the resistivity. This direct Cu writing technique on soft materials is useful for fabricating flexible microdevices.

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