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 ◽  
...  

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.

2008 ◽  
Vol 91 (3) ◽  
pp. 385-392 ◽  
Author(s):  
N. Jegenyes ◽  
J. Etchepare ◽  
B. Reynier ◽  
D. Scuderi ◽  
A. Dos-Santos ◽  
...  

2019 ◽  
Vol 33 (08) ◽  
pp. 1950061
Author(s):  
K. A. Brekhov ◽  
N. A. Ilyin ◽  
E. D. Mishina ◽  
P. A. Prudkovskii ◽  
G. Kh. Kitaeva

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.


2015 ◽  
Vol 40 (24) ◽  
pp. 5726 ◽  
Author(s):  
Zhaohui Wang ◽  
Bin Zeng ◽  
Guihua Li ◽  
Hongqiang Xie ◽  
Wei Chu ◽  
...  

Photonics ◽  
2020 ◽  
Vol 7 (4) ◽  
pp. 99
Author(s):  
Zhengquan Fan ◽  
Xiang Zhang ◽  
Qi Lu ◽  
Yu Luo ◽  
Qingqing Liang ◽  
...  

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.


2009 ◽  
Vol 105 (7) ◽  
pp. 07D305 ◽  
Author(s):  
T. Hartenstein ◽  
G. Lefkidis ◽  
W. Hübner ◽  
G. P. Zhang ◽  
Y. Bai

2018 ◽  
Vol 27 (7) ◽  
pp. 077901 ◽  
Author(s):  
Zehua Wu ◽  
Nan Zhang ◽  
Xiaonong Zhu ◽  
Liqun An ◽  
Gangzhi Wang ◽  
...  

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