HIGH-ENERGY FEMTOSECOND LASER INDUCED COLLATERAL DAMAGES ON SILICON AND GLASS

2006 ◽  
Vol 42 (supp) ◽  
pp. 44 ◽  
Author(s):  
Yanshen WANG
Keyword(s):  
Femtosecond Laser ◽  
High Energy

Wavelength tunable, high energy femtosecond laser pulses directly generated from large-mode-area photonic crystal fiber

2012 ◽  
Vol 285 (10-11) ◽  
pp. 2715-2718 ◽  
Author(s):  
Chi Zhang ◽  
Yu-ying Zhang ◽  
Ming-lie Hu ◽  
Si-jia Wang ◽  
You-jian Song ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Femtosecond Laser ◽  
Photonic Crystal Fiber ◽  
Laser Pulses ◽  
High Energy ◽  
Femtosecond Laser Pulses ◽  
Large Mode Area ◽  
Crystal Fiber ◽  
Wavelength Tunable ◽  
Mode Area

scholarly journals Space-Selective Control of Functional Crystals by Femtosecond Laser: A Comparison between SrO-TiO2-SiO2 and Li2O-Nb2O5-SiO2 Glasses

Crystals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 979
Author(s):  
Xuan He ◽  
Qiming Liu ◽  
Matthieu Lancry ◽  
François Brisset ◽  
Bertrand Poumellec
Keyword(s):  
Femtosecond Laser ◽  
Second Harmonic ◽  
Scanning Speed ◽  
High Energy ◽  
Femtosecond Laser Irradiation ◽  
Laser Polarization ◽  
Electron Backscattered Diffraction ◽  
Sio2 Glass ◽  
Significant Difference ◽  
Induced Crystallization

We report on space-selective crystallization of congruent and polar Sr2TiSi2O8 crystals in a stoichiometric SrO-TiO2-SiO2 glass induced by (1030 nm, 300 fs) femtosecond laser irradiation. This allows us to compare with non-congruent laser-induced crystallization of polar LiNbO3 in non-stoichiometric Li2O-Nb2O5-SiO2 glass and gain information on the mechanism of nanocrystals orientation with the laser polarization that we pointed out previously. Using scanning electron microscopy (SEM), second harmonic generation (SHG), and electron backscattered diffraction (EBSD), we studied the laser-induced crystallization according to the laser processing parameters (pulse energy, pulse repetition rate, scanning speed). We found (1) a domain where the laser track is filled with crystals not perfectly textured (low energy), (2) a domain where an amorphous volume remains surrounded by a crystallized shell (high energy). This arises from Sr out-diffusion and may give rise to the crystallization of both SrTiO3 and Sr2TiSi2O8 phases at low speed. In the one-phase domain (at higher speed), the possibility to elaborate a tube with a perfect Fresnoite texture is found. A significant difference in size and morphology whereas the crystallization threshold remains similar is discussed based on glass thermal properties. Contrarily to Li2O-Nb2O5-SiO2 (LNS) glass, no domain of oriented nanocrystallization controlled by the laser polarization has been found in SrO-TiO2-SiO2 (STS) glass, which is attributed to the larger crystallization speed in STS glass. No nanogratings have also been found that is likely due to the congruency of the glass.

scholarly journals High energy and average power femtosecond laser for driving mid-infrared optical parametric amplifiers

2013 ◽  
Vol 38 (15) ◽  
pp. 2746 ◽  
Author(s):  
P. Malevich ◽  
G. Andriukaitis ◽  
T. Flöry ◽  
A. J. Verhoef ◽  
A. Fernández ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Average Power ◽  
High Energy ◽  
Parametric Amplifiers ◽  
Mid Infrared ◽  
Optical Parametric ◽  
Optical Parametric Amplifiers

scholarly journals Femtosecond Laser Pulses Amplification in Crystals

Crystals ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 347
Author(s):  
Dabu
Keyword(s):  
Femtosecond Laser ◽  
Laser Pulses ◽  
High Energy ◽  
Femtosecond Laser Pulses ◽  
Phase Matching ◽  
Chirped Pulse ◽  
Nonlinear Crystals ◽  
Pulse Amplification ◽  
Chirped Pulse Amplification ◽  
Laser Crystals

This paper describes techniques for high-energy laser pulse amplification in multi-PW femtosecond laser pulses. Femtosecond laser pulses can be generated and amplified in laser media with a broad emission spectral bandwidth, like Ti:sapphire crystals. By chirped pulse amplification (CPA) techniques, hundred-Joule amplified laser pulses can be obtained. Multi-PW peak-power femtosecond pulses are generated after recompression of amplified chirped laser pulses. The characteristics and problems of large bandwidth laser pulses amplification in Ti:sapphire crystals are discussed. An alternative technique, based on optical parametric chirped pulse amplification (OPCPA) in nonlinear crystals, is presented. Phase-matching conditions for broad bandwidth parametric amplification in nonlinear crystals are inferred. Ultra-broad phase matching bandwidth of more than 100 nm, able to support the amplification of sub-10 fs laser pulses, are demonstrated in nonlinear crystals, such as Beta Barium Borate (BBO), Potassium Dideuterium Phosphate (DKDP), and Lithium Triborate (LBO). The advantages and drawbacks of CPA amplification in laser crystals and OPCPA in nonlinear crystals are discussed. A hybrid amplification method, which combines low-medium energy OPCPA in nonlinear crystals with high energy CPA in large aperture laser crystals, is described. This technique is currently used for the development of 10-PW laser systems, with sub-20 fs pulse duration and more than 1012 intensity contrast of output femtosecond pulses.

The Influence of DOS Effects on Ablation Properties in High Energy Femtosecond Laser Ablation Process

2011 ◽  
Vol 689 ◽  
pp. 11-15 ◽  
Author(s):  
Hui Li Wei ◽  
Feng Mao ◽  
Xin Yu Tan ◽  
Xiang Ping Huang ◽  
Zhao Wang ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Femtosecond Laser ◽  
Femtosecond Laser Ablation ◽  
High Energy ◽  
Gold Target ◽  
Laser Ablation Process ◽  
Electron Phonon Coupling ◽  
Melting Threshold ◽  
Electronic Heat ◽  
The Relationship

The numerical simulation of high-energy femtosecond laser ablation on metal target is studied in this paper. Based on the two-temperature model (TTM), a new model considering the effects of the electron density of states (DOS) on electronic heat capacity, electron-phonon coupling coefficient and electronic thermal conductivity is established. As an example of gold target, the relationship between the melting threshold and the thickness of gold films is numerically calculated. Our result is more consistent with the experimental datum in contrast to the results without considering the DOS effects. This shows that the revised TTM of high-energy femtosecond laser ablation (i.e. DOS-TTM) is more reasonable compared with general used TTM.

Tunable mid-infrared, high-energy femtosecond laser source for glyco-prtein structure analysis

2006 ◽  
Author(s):  
Tomohiro Imahoko ◽  
Zhigang Zhang ◽  
Tetuo Ando ◽  
Koji Yoshida ◽  
Norihiro Inoue ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Structure Analysis ◽  
High Energy ◽  
Laser Source ◽  
Mid Infrared

High-energy femtosecond laser pulse compression in single- and multi-ionization regime of rare gases: experiment versus theory

2013 ◽  
Vol 111 (1) ◽  
pp. 75-87 ◽  
Author(s):  
T. Auguste ◽  
C. Fourcade Dutin ◽  
A. Dubrouil ◽  
O. Gobert ◽  
O. Hort ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Femtosecond Laser ◽  
Femtosecond Laser Pulse ◽  
Pulse Compression ◽  
High Energy ◽  
Rare Gases ◽  
Experiment Versus

Influence of Electron-Phonon Coupling Coefficient on Properties in Femtosecond Laser Ablation

2015 ◽  
Vol 814 ◽  
pp. 144-149 ◽  
Author(s):  
Ran Xiang ◽  
Xin Yu Tan ◽  
Hui Li Wei
Keyword(s):  
Laser Ablation ◽  
Femtosecond Laser ◽  
Electron Temperature ◽  
Coupling Coefficient ◽  
Femtosecond Laser Ablation ◽  
High Energy ◽  
Rapid Decline ◽  
Phonon Coupling ◽  
Electron Phonon Coupling ◽  
Coupling Time

Thermodynamics effects generated by femtosecond laser ablation are very important. In this work, the numerical simulation of high-energy femtosecond laser ablation especially the electro-phonon coupling coefficient influence of high-energy femtosecond laser ablation on metal target was studied. A new two-temperature model (TTM) which considered the effects of electron density of states (DOS) on electron-phonon coupling coefficient was first established, then the temperature evolvement for electron and lattice in different electro-phonon coupling coefficient G, and the effect of G on electron temperature and lattice temperature and electron-phonon coupling time were emphatically analyzed. The results showed that the electron-phonon coupling coefficient strongly affected the surface electron temperature and coupling time in the femtosecond laser ablation. The smaller the electron-phonon coupling coefficient was, the more the energy transmission from electronic to ion subsystem. As a result, the smaller the value of electron-phonon coupling coefficient, a more rapid decline for the temperature of electronic sub-system achieved. This work will offer help for the future investigation of material fabrication by femtosecond laser ablation.

Holographic femtosecond laser manipulation for advanced material processing

2016 ◽  
Vol 5 (1) ◽  
Author(s):  
Satoshi Hasegawa ◽  
Yoshio Hayasaki
Keyword(s):  
Material Processing ◽  
Femtosecond Laser ◽  
Laser Processing ◽  
High Speed ◽  
Large Scale ◽  
High Energy ◽  
Material Surface ◽  
Two Photon ◽  
Computer Generated Hologram ◽  
Femtosecond Laser Processing

AbstractParallel femtosecond laser processing using a computer-generated hologram displayed on a spatial light modulator, known as holographic femtosecond laser processing, provides the advantages of high throughput and high-energy use efficiency. Therefore, it has been widely used in many applications, including laser material processing, two-photon polymerization, two-photon microscopy, and optical manipulation of biological cells. In this paper, we review the development of holographic femtosecond laser processing over the past few years from the perspective of wavefront and polarization modulation. In particular, line-shaped and vector-wave femtosecond laser processing are addressed. These beam-shaping techniques are useful for performing large-area machining in laser cutting, peeling, and grooving of materials and for high-speed fabrication of the complex nanostructures that are applied to material-surface texturing to control tribological properties, wettability, reflectance, and retardance. Furthermore, issues related to the nonuniformity of diffraction light intensity in optical reconstruction and wavelength dispersion from a computer-generated hologram are addressed. As a result, large-scale holographic femtosecond laser processing over 1000 diffraction spots was successfully demonstrated on a glass sample.

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