Influence of the beam-focus size on femtosecond laser-induced damage threshold in fused silica

2008 ◽  
Author(s):  
N. Sanner ◽  
B. Bussiere ◽  
O. Utéza ◽  
A. Leray ◽  
T. Itina ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Damage Threshold ◽  
Fused Silica ◽  
Laser Induced Damage

scholarly journals Observation and analysis of structural changes in fused silica by continuous irradiation with femtosecond laser light having an energy density below the laser-induced damage threshold

2014 ◽  
Vol 5 ◽  
pp. 1334-1340 ◽  
Author(s):  
Wataru Nomura ◽  
Tadashi Kawazoe ◽  
Takashi Yatsui ◽  
Makoto Naruse ◽  
Motoichi Ohtsu
Keyword(s):  
Molecular Structure ◽  
Energy Density ◽  
Femtosecond Laser ◽  
Laser Light ◽  
Damage Threshold ◽  
Fused Silica ◽  
Optical Component ◽  
Continuous Irradiation ◽  
Silica Substrate ◽  
Laser Induced Damage

The laser-induced damage threshold (LIDT) is widely used as an index for evaluating an optical component’s resistance to laser light. However, a degradation in the performance of an optical component is also caused by continuous irradiation with laser light having an energy density below the LIDT. Therefore, here we focused on the degradation in performance of an optical component caused by continuous irradiation with femtosecond laser light having a low energy density, i.e., laser-induced degradation. We performed an in situ observation and analysis of an increase in scattering light intensity in fused silica substrates. In experiments conducted using a pulsed laser with a wavelength of 800 nm, a pulse width of 160 fs and pulse repetition rate of 1 kHz, we found that the scattered light intensity increased starting from a specific accumulated fluence, namely, that the laser-induced degradation had a threshold. We evaluated the threshold fluence F t as 6.27 J/cm2 and 9.21 J/cm2 for the fused silica substrates with surface roughnesses of 0.20 nm and 0.13 nm in R a value, respectively, showing that the threshold decreased as the surface roughness increased. In addition, we found that the reflected light spectrum changed as degradation proceeded. We analyzed the details of the degradation by measuring instantaneous reflectance changes with a pump–probe method; we observed an increase in the generation probability of photogenerated carriers in a degraded silica substrate and a damaged silica substrate and observed a Raman signal originating from a specific molecular structure of silica. From these findings, we concluded that compositional changes in the molecular structure occurred during degradation due to femtosecond laser irradiation having an energy density below the LIDT.

scholarly journals Investigation of laser-induced damage threshold improvement mechanism during ion beam sputtering of fused silica

2017 ◽  
Vol 25 (23) ◽  
pp. 29260 ◽  
Author(s):  
Mingjin Xu ◽  
Feng Shi ◽  
Lin Zhou ◽  
Yifan Dai ◽  
Xiaoqiang Peng ◽  
...  
Keyword(s):  
Ion Beam ◽  
Damage Threshold ◽  
Fused Silica ◽  
Ion Beam Sputtering ◽  
Beam Sputtering ◽  
Laser Induced Damage

Wavelength dependence of femtosecond laser-induced damage threshold of optical materials

2015 ◽  
Vol 117 (22) ◽  
pp. 223103 ◽  
Author(s):  
L. Gallais ◽  
D.-B. Douti ◽  
M. Commandré ◽  
G. Batavičiūtė ◽  
E. Pupka ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Optical Materials ◽  
Damage Threshold ◽  
Wavelength Dependence ◽  
Laser Induced Damage

Femtosecond laser induced damage threshold (LIDT) of 3D nanolithography made micro- and nano-optical elements

2019 ◽  
Author(s):  
Agnė Butkutė ◽  
Linas Jonušauskas ◽  
Darius Gailevičius ◽  
Vygantas Mizeikis ◽  
Mangirdas Malinauskas
Keyword(s):  
Femtosecond Laser ◽  
Damage Threshold ◽  
Optical Elements ◽  
Laser Induced Damage

scholarly journals Laser-Induced Point Defects in Fused Silica Irradiated by UV Laser in Vacuum

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Xiaoyan Zhou ◽  
Xinda Zhou ◽  
Jin Huang ◽  
Qiang Cheng ◽  
Fengrui Wang ◽  
...  
Keyword(s):  
Point Defects ◽  
Fluorescence Spectra ◽  
Uv Spectroscopy ◽  
Damage Threshold ◽  
Laser Pulses ◽  
Fused Silica ◽  
Third Harmonic ◽  
Structural Modifications ◽  
Laser Induced Damage ◽  
Induced Defects

High-purity fused silica irradiated by third harmonic of the Nd:YAG laser in vacuum with different laser pulse parameters was studied experimentally. Laser-induced defects are investigated by UV spectroscopy, and fluorescence spectra and correlated to the structural modifications in the glass matrix through Raman spectroscopy. Results show that, for laser fluence below laser-induced damage threshold (LIDT), the absorbance and intensity of fluorescence bands increase with laser energies and/or number of laser pulses, which indicates that laser-induced defects are enhanced by laser energies and/or number of laser pulses in vacuum. The optical properties of these point defects were discussed in detail.

Ultraviolet-infrared femtosecond laser-induced damage in fused silica andCaF2crystals

2006 ◽  
Vol 73 (5) ◽  
Author(s):  
T. Q. Jia ◽  
H. X. Chen ◽  
M. Huang ◽  
F. L. Zhao ◽  
X. X. Li ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Fused Silica ◽  
Laser Induced Damage

The polarization-dependence of femtosecond laser damage threshold inside fused silica

2008 ◽  
Vol 91 (3-4) ◽  
pp. 597-599 ◽  
Author(s):  
D. Liu ◽  
Y. Li ◽  
M. Liu ◽  
H. Yang ◽  
Q. Gong
Keyword(s):  
Femtosecond Laser ◽  
Damage Threshold ◽  
Fused Silica ◽  
Polarization Dependence ◽  
Laser Damage Threshold ◽  
Laser Damage
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