Femtosecond Laser-induced Crystallization in As-deposited Ge1Sb2Te4 Films

2003 ◽  
Vol 803 ◽  
Author(s):  
Qin F. Wang ◽  
Lu P. Shi ◽  
Su M. Huang ◽  
Xiang S. Miao ◽  
Kai P. Wong ◽  
...  
Keyword(s):  
Phase Transition ◽  
Femtosecond Laser ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Time Resolved ◽  
Whole Process ◽  
Thermal Phase Transition ◽  
Thermal Phase ◽  
Time Resolved Imaging ◽  
Induced Crystallization

ABSTRACTTime resolved imaging has been used to investigate the whole process of the crystallization induced by intense 130 femtosecond laser pulses in as-deposited Ge1Sb2Te4 films. With an average fluence of 24mJ/cm2 a transient non-equilibrium state of the excited material is formed within 1 picosecond. The results are consistent with an electronically induced non-thermal phase transition.

Time-resolved dynamics analysis of nanoparticles applying dual femtosecond laser pulses

2008 ◽  
Vol 91 (3) ◽  
pp. 385-392 ◽  
Author(s):  
N. Jegenyes ◽  
J. Etchepare ◽  
B. Reynier ◽  
D. Scuderi ◽  
A. Dos-Santos ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Dynamics Analysis ◽  
Time Resolved

The temperature dependence of the photoinduced soft mode in Sn2P2S6 crystal

2019 ◽  
Vol 33 (08) ◽  
pp. 1950061
Author(s):  
K. A. Brekhov ◽  
N. A. Ilyin ◽  
E. D. Mishina ◽  
P. A. Prudkovskii ◽  
G. Kh. Kitaeva
Keyword(s):  
Phase Transition ◽  
Femtosecond Laser ◽  
Curie Temperature ◽  
Temperature Dependence ◽  
Oscillation Frequency ◽  
Phonon Mode ◽  
Soft Mode ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Curie Temperature Tc

In this paper, we present the results of the temperature dependence studies of the photoinduced phonon mode which appears in a ferroelectric-semiconductor Sn2P2S6 (SPS) crystal under the influence of femtosecond laser pulses. We show that its behavior reminds the soft mode one near the phase transition. However, the observed decrease in the oscillation frequency in the vicinity of Curie temperature Tc is much weaker than previously reported. This can be explained by the shadowing of the pure soft mode by its interaction with other photoinduced modes.

scholarly journals Time-resolved shadowgraphs of transient plasma induced by spatiotemporally focused femtosecond laser pulses in fused silica glass

2015 ◽  
Vol 40 (24) ◽  
pp. 5726 ◽  
Author(s):  
Zhaohui Wang ◽  
Bin Zeng ◽  
Guihua Li ◽  
Hongqiang Xie ◽  
Wei Chu ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Silica Glass ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Fused Silica ◽  
Time Resolved ◽  
Transient Plasma ◽  
Fused Silica Glass

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.

Time-resolved and energy-dispersed spin excitation in ferromagnets and clusters under influence of femtosecond laser pulses

2009 ◽  
Vol 105 (7) ◽  
pp. 07D305 ◽  
Author(s):  
T. Hartenstein ◽  
G. Lefkidis ◽  
W. Hübner ◽  
G. P. Zhang ◽  
Y. Bai
Keyword(s):  
Femtosecond Laser ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Spin Excitation ◽  
Time Resolved

Time-resolved shadowgraphs and morphology analyses of aluminum ablation with multiple femtosecond laser pulses

2018 ◽  
Vol 27 (7) ◽  
pp. 077901 ◽  
Author(s):  
Zehua Wu ◽  
Nan Zhang ◽  
Xiaonong Zhu ◽  
Liqun An ◽  
Gangzhi Wang ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Time Resolved
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