scholarly journals Pump-probe imaging of the fs-ps-ns dynamics during femtosecond laser Bessel beam drilling in PMMA

2015 ◽  
Vol 23 (25) ◽  
pp. 32728 ◽  
Author(s):  
Yanwu Yu ◽  
Lan Jiang ◽  
Qiang Cao ◽  
Bo Xia ◽  
Qingsong Wang ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Bessel Beam ◽  
Pump Probe

Non-diffraction-length Bessel-beam femtosecond laser drilling of high-aspect-ratio microholes in PMMA

Optik ◽  
2021 ◽  
Vol 229 ◽  
pp. 166295
Author(s):  
Haoran Wang ◽  
Fan Zhang ◽  
Kaiwen Ding ◽  
Ji'an Duan
Keyword(s):  
Aspect Ratio ◽  
Femtosecond Laser ◽  
High Aspect Ratio ◽  
Bessel Beam ◽  
Laser Drilling

Ultrafast Relaxation Character of Nonequilibrium Carriers in GaAs Excited by Femtosecond Laser

2006 ◽  
Vol 532-533 ◽  
pp. 572-575
Author(s):  
Ming Zhou ◽  
Dong Qing Yuan ◽  
Li Peng Liu ◽  
Hui Xia Liu ◽  
Nai Fei Ren
Keyword(s):  
Femtosecond Laser ◽  
Relaxation Curve ◽  
Refraction Index ◽  
Free Carrier ◽  
Index Of Refraction ◽  
Lattice Temperature ◽  
Pump Probe ◽  
Recombination Lifetime ◽  
Carrier Effect ◽  
Carrier Recombination

Experiment setup of femtosecond laser pump probe was established, the time resolution of time-delay setting reached 67fs. By use of femtosecond laser with width of 30fs and wavelength is 796nm the dependence of transient change of reflectivity on delayed time in GaAs was measured by pump-probe method. By calculating the change of complex index of refraction (%n), free-carrier effect, lattice-temperature and carrier recombination contributions to relaxation curve was analyzed. When the carrier density N is 1.44×1018/cm3, free-carrier contribution to refraction index %nFC is -7.33×10-4, lattice-temperature %nLT is 0.85×10-4. Based on recombination rate equation, recombination lifetime of 980ps was deduced.

scholarly journals Superamphiphobic Surfaces with Controllable Adhesion Fabricated by Femtosecond Laser Bessel Beam on PTFE

2019 ◽  
Vol 6 (14) ◽  
pp. 1900550 ◽  
Author(s):  
Dongkai Chu ◽  
Subhash C. Singh ◽  
Jiale Yong ◽  
Zhibing Zhan ◽  
Xiaoyan Sun ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Bessel Beam

scholarly journals Understanding the Seeding Pulse-Induced Optical Amplification in N 2 + Pumped by 800 NM Femtosecond Laser Pulses

Photonics ◽  
2020 ◽  
Vol 7 (4) ◽  
pp. 99
Author(s):  
Zhengquan Fan ◽  
Xiang Zhang ◽  
Qi Lu ◽  
Yu Luo ◽  
Qingqing Liang ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Optical Gain ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Time Resolved ◽  
Optical Amplification ◽  
Pump Probe ◽  
Amplification Process ◽  
Energy Amplification

Nitrogen ions pumped by intense femtosecond laser pulses present an optical gain at 391.4 nm, evident by energy amplification of an injected resonant seeding pulse. We report a time-resolved measurement of the amplification process with seeding pulses having varying intensities. It is found that the amplification factor depends on the intensity of the seeding pulse and the effective temporal window for the optical gain becomes longer by applying more intense seeding pulses. These two features are in sharp contrast with classic pump-probe experiments, pinpointing the crucial role of macroscopic coherence and its dynamics during the lasing process. We further measure the temporal profile of the amplified emission for seeding pulse injected at different time delays. A complicated temporal behavior is observed, which highlights the nature of the superfluorescence.

scholarly journals Ultrafast pump-probe ellipsometry and microscopy reveal the surface dynamics of femtosecond laser ablation of aluminium and stainless steel

2020 ◽  
Vol 511 ◽  
pp. 145514 ◽  
Author(s):  
Jan Winter ◽  
Stephan Rapp ◽  
Maximilian Spellauge ◽  
Constanze Eulenkamp ◽  
Michael Schmidt ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Laser Ablation ◽  
Femtosecond Laser ◽  
Femtosecond Laser Ablation ◽  
Surface Dynamics ◽  
Pump Probe

Ablation enhancement of fused silica glass by femtosecond laser double-pulse Bessel beam

2020 ◽  
Vol 37 (11) ◽  
pp. 3535
Author(s):  
Dongkai Chu ◽  
Peng Yao ◽  
Xiaoyan Sun ◽  
Kai Yin ◽  
Chuanzhen Huang
Keyword(s):  
Femtosecond Laser ◽  
Silica Glass ◽  
Bessel Beam ◽  
Fused Silica ◽  
Double Pulse ◽  
Fused Silica Glass
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