Ultrafast Structural Changes Induced by Femtosecond Laser Pulses

2003 ◽  
pp. 175-214 ◽  
Author(s):  
H. O. Jeschke ◽  
M. E. Garcia
Keyword(s):  
Femtosecond Laser ◽  
Structural Changes ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses

Structural changes accompanying color center formation in lithium fluoride exposed to femtosecond laser pulses

2014 ◽  
Vol 50 (6) ◽  
pp. 625-630 ◽  
Author(s):  
L. I. Bryukvina ◽  
S. V. Lipko ◽  
A. V. Kuznetsov ◽  
E. F. Martynovich
Keyword(s):  
Femtosecond Laser ◽  
Color Center ◽  
Lithium Fluoride ◽  
Structural Changes ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses

Structural changes in BK7 glass upon exposure to femtosecond laser pulses

2010 ◽  
Vol 42 (4) ◽  
pp. 715-718 ◽  
Author(s):  
Douglas J. Little ◽  
Martin Ams ◽  
Simon Gross ◽  
Peter Dekker ◽  
Christopher T. Miese ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Structural Changes ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Bk7 Glass

Ultrafast Laser Induced Structural Modification of Fused Silica—Part I: Feature Formation Mechanisms

2010 ◽  
Vol 132 (6) ◽  
Author(s):  
Siniša Vukelić ◽  
Panjawat Kongsuwan ◽  
Y. Lawrence Yao
Keyword(s):  
Femtosecond Laser ◽  
Material Properties ◽  
Structural Changes ◽  
Three Dimensional ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Fused Silica ◽  
Optical Data ◽  
Formation Mechanisms ◽  
Force Microscopy

Nonlinear absorption of femtosecond-laser pulses enables the induction of structural changes in the interior of bulk transparent materials without affecting their surface. This property can be exploited for transmission welding of transparent dielectrics, three dimensional optical data storages, and waveguides. In the present study, femtosecond-laser pulses were tightly focused within the interior of bulk fused silica specimen. Localized plasma was formed, initiating rearrangement of the network structure. Features were generated through employment of single pulses as well as pulse trains using various processing conditions. The change in material properties were studied through employment of differential interference contrast optical microscopy and atomic force microscopy. The morphology of the altered material as well as the nature of the physical mechanisms (thermal, explosive plasma expansion, or in-between) responsible for the alteration of material properties as a function of process parameters is discussed.

Structural Modification of Amorphous Fused Silica Under Femtosecond Laser Irradiation

2008 ◽  
Author(s):  
S. Vukelic ◽  
B. Gao ◽  
S. Ryu ◽  
Y. L. Yao
Keyword(s):  
Femtosecond Laser ◽  
Material Properties ◽  
Structural Changes ◽  
Three Dimensional ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Fused Silica ◽  
Femtosecond Laser Irradiation ◽  
Optical Data ◽  
Linear Absorption

Non-linear absorption of femtosecond laser pulses enables the induction of structural changes in the interior of bulk transparent materials without affecting their surface. This property can be exploited for the transmission welding of transparent dielectrics, three dimensional optical data storages and waveguides. In the present study, femtosecond laser pulses were tightly focused within the interior of bulk fused silica specimen. Localized plasma was formed, initiating rearrangement of the network structure. The change in material properties were studied through employment of spatially resolved Raman spectroscopy, atomic force microscopy and optical microscopy. The nature of the physical mechanisms responsible for the alteration of material properties as a function of process parameters is discussed.

Ultrafast Laser Induced Structural Modification of Fused Silica—Part II: Spatially Resolved and Decomposed Raman Spectral Analysis

2010 ◽  
Vol 132 (6) ◽  
Author(s):  
Siniša Vukelić ◽  
Panjawat Kongsuwan ◽  
Sunmin Ryu ◽  
Y. Lawrence Yao
Keyword(s):  
Femtosecond Laser ◽  
Structural Changes ◽  
Volume Fraction ◽  
Random Network ◽  
Target Material ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Fused Silica ◽  
Process Conditions ◽  
Spatially Resolved

Nonlinear absorption of femtosecond laser pulses enables the induction of structural changes in the interior of bulk transparent materials without affecting their surface. In the present study, femtosecond laser pulses were tightly focused within the interior of bulk fused silica specimen. Localized plasma was formed, initiating rearrangement of the random network structure. Cross sections of the induced features were examined via decomposition of spatially resolved Raman spectra and a new method for the quantitative characterization of the structure of amorphous fused silica was developed. The proposed method identifies the volume fraction distribution of ring structures within the continuous random network of the probed volume of the target material and changes of the distribution with laser process conditions. Effects of the different process conditions and the material response to different mechanisms of feature generation were discussed as well.

Ultrafast structural changes in germanium triggered by femtosecond laser pulses

2005 ◽  
Author(s):  
Eckhart Förster ◽  
Andreas Morak ◽  
Tino Kämpfer ◽  
Ingo Uschmann ◽  
Ortrud Wehrhan ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Structural Changes ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses

Structural changes in fused silica after exposure to focused femtosecond laser pulses

2001 ◽  
Vol 26 (21) ◽  
pp. 1726 ◽  
Author(s):  
J. W. Chan ◽  
T. Huser ◽  
S. Risbud ◽  
D. M. Krol
Keyword(s):  
Femtosecond Laser ◽  
Structural Changes ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Fused Silica
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