scholarly journals Study of the time-resolved emission spectra of the ejected plume generated by ultrashort laser ablation of graphite

2015 ◽  
Vol 64 (21) ◽  
pp. 214201
Author(s):  
Feng Pei-Pei ◽  
Wu Han ◽  
Zhang Nan
Keyword(s):  
Laser Ablation ◽  
Emission Spectra ◽  
Time Resolved ◽  
Ultrashort Laser

Spectrum analysis of plasma produced by pulsed laser ablation of GaAs

2007 ◽  
Vol 73 (2) ◽  
pp. 231-239 ◽  
Author(s):  
AI HUA LIU
Keyword(s):  
Laser Ablation ◽  
Ambient Pressure ◽  
Pulsed Laser ◽  
Emission Spectra ◽  
Diagnostic Technique ◽  
Pulsed Laser Ablation ◽  
Stark Broadening ◽  
Experimental Conditions ◽  
Time Resolved ◽  
Excited Atoms

Abstract.A time-resolved diagnostic technique was used to investigate the emission spectra from the plasmas produced by 1.06 μm, 10 ns pulsed laser ablation of semiconductor GaAs. The characteristics of the species in plasma produced at different ambient pressure were analyzed. The full width at half maximum of the spectral line was measured and analyzed according to obtained spectra of the excited atoms; several line broadening factors were estimated according to our experimental conditions and the results indicate that the Stark broadening is the main broadening mechanism. Under the assumption of local thermodynamic equilibrium, the time evolution of electron number density was deduced from the Stark broadening measurements.

scholarly journals Generation and evolution of plasma during femtosecond laser ablation of silicon in different ambient gases

2013 ◽  
Vol 31 (3) ◽  
pp. 539-545 ◽  
Author(s):  
Zhandong Chen ◽  
Qiang Wu ◽  
Ming Yang ◽  
Baiquan Tang ◽  
Jianghong Yao ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Femtosecond Laser ◽  
Emission Spectra ◽  
Femtosecond Laser Ablation ◽  
Coulomb Repulsion ◽  
Time Resolved ◽  
Monovalent Ions ◽  
Ambient Gases ◽  
Ambient Gas ◽  
Deposition Effect

AbstractGeneration and evolution of plasma during femtosecond laser ablation of silicon are studied by steady-state and time-resolved spectroscopy in air, N2, SF6, and under vacuum. The plasma is generated faster than 200 ps (time resolution of our experiment) after excitation and mainly contains atoms and monovalent ions of silicon. Time-resolved spectra prove that silicon ions are faster than the silicon atoms which may be attributed to Coulomb repulsion and a local electric field when they are ejected from the silicon surface. During plasma evolution, ambient gas causes a confinement effect that enhances the dissociation of ambient gas molecules and the re-deposition of the removed material and leads to higher intensity and longer lifetime of the emission spectra. In SF6, a chemical reaction increases the plasma density and weakens the re-deposition effect. The different processes during plasma evolution strongly influence microstructure formation.

Optical, electrochemical and third-order nonlinear optical studies of triphenylamine substituted zinc phthalocyanine

2016 ◽  
Vol 20 (08n11) ◽  
pp. 1173-1181 ◽  
Author(s):  
Narra Vamsi Krishna ◽  
Puliparambil Thilakan Anusha ◽  
S. Venugopal Rao ◽  
L. Giribabu
Keyword(s):  
Nonlinear Optical ◽  
Emission Spectra ◽  
Optical Emission ◽  
Soret Band ◽  
Laser Pulses ◽  
Zinc Phthalocyanine ◽  
Third Order ◽  
Time Resolved ◽  
Nlo Properties ◽  
Scan Data

Zinc phthalocyanine possessing triphenylamine at its peripheral position has been synthesized and its optical, emission, electrochemical and third-order nonlinear optical (NLO) properties were investigated. Soret band was broadened due to the presence of triphenylamine moiety. Electrochemical properties indicated that both oxidation and reduction processes were ring centered. Emission spectra were recorded in different solvents and the fluorescence yields obtained were in the range of 0.02–0.17 while the time-resolved fluorescence data revealed radiative lifetimes of typically few ns. Third-order NLO properties of this molecule have been examined using the Z-scan technique with picosecond (ps) and femtoseocnd (fs) pulses. Closed and open aperture Z-scan data were recorded with 2 ps/1 50 fs laser pulses at a wavelength of 800 nm and NLO coefficients were extracted from both the data. Our data clearly suggests the potential of this molecule for photonics applications.

Time-resolved measurements of sodium emission in the plume generated by laser ablation of myocardium tissue

2004 ◽  
Author(s):  
Hanriete P. de Souza ◽  
Egberto Munin ◽  
Carlos Eduardo de Vilhena Paiva ◽  
Leandro P. Alves ◽  
Marcela L. Redigolo ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Time Resolved ◽  
Time Resolved Measurements

Ultrashort laser ablation of bulk copper targets: Dynamics and size distribution of the generated nanoparticles

2014 ◽  
Vol 115 (24) ◽  
pp. 243301 ◽  
Author(s):  
N. Tsakiris ◽  
K. K. Anoop ◽  
G. Ausanio ◽  
M. Gill-Comeau ◽  
R. Bruzzese ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Size Distribution ◽  
Ultrashort Laser

scholarly journals Time-Resolved Quadrupole Mass Spectrometric Studies on Pulsed Laser Ablation of TiO2

1999 ◽  
Vol 18 (3) ◽  
pp. 99-109 ◽  
Author(s):  
Yongxin Tang ◽  
Zhenhui Han ◽  
Qizong Qin
Keyword(s):  
Laser Ablation ◽  
Continuous Wave ◽  
Center Of Mass ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Ionic Species ◽  
Mass Spectrometric ◽  
Quadrupole Mass ◽  
Time Resolved ◽  
Ambient Oxygen

Pulsed laser ablation of TiO2 at 355 nm and 532 nm has been investigated using an angleand time-resolved quadrupole mass spectrometric technique. The major ablated species include O (m/e = 16), O2 (m/e = 32), Ti (m/e = 48), TiO (m/e = 64) and TiO2 (m/e = 80). The time-of-flight (TOF) spectra of ablated species are measured for the ionic and neutral ablated species, and they can be fitted by a Maxwell – Boltzmann (M – B) distribution with a center-of-mass velocity. The measured angular distributions of the ionic species (O+ and Ti+) and the neutral species (O and Ti) can be fitted with cos⁡nθ and a cos⁡θ + (1−a)cos⁡nθ, respectively. In addition, a continuous wave oxygen molecular beam is introduced into the ablated plume, and the enhancement of the signal intensities of TiO is observed. It implies that the ablated Ti atoms/ions species can react with ambient oxygen molecules in the gas phase. In the meanwhile, the physicochemical mechanism of pulsed laser ablation of TiO2 is discussed.

Time-resolved electron imaging of femtosecond laser ablation

2005 ◽  
pp. 825-827
Author(s):  
Yasuaki Okano ◽  
Yoichiro Hironaka ◽  
Ken-ichi Kondo ◽  
Kazutaka G. Nakamura
Keyword(s):  
Laser Ablation ◽  
Femtosecond Laser ◽  
Femtosecond Laser Ablation ◽  
Time Resolved ◽  
Electron Imaging
Sign in / Sign up

Export Citation Format

Share Document