Femtosecond laser excited second harmonic and multiphoton absorption induced UV luminescence generation behaviour of ZnO nanofibers

Optik ◽  
2018 ◽  
Vol 154 ◽  
pp. 320-324
Author(s):  
Rudrashish Panda ◽  
Avanendra Singh ◽  
Rudranarayan Samal ◽  
Sayantan Bhattacharya ◽  
Pratap K. Sahoo ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Second Harmonic ◽  
Multiphoton Absorption ◽  
Uv Luminescence ◽  
Zno Nanofibers

scholarly journals An Optical Frequency Domain Angle Measurement Method Based on Second Harmonic Generation

Sensors ◽  
2021 ◽  
Vol 21 (2) ◽  
pp. 670
Author(s):  
Wijayanti Dwi Astuti ◽  
Hiraku Matsukuma ◽  
Masaru Nakao ◽  
Kuangyi Li ◽  
Yuki Shimizu ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Second Harmonic Generation ◽  
Frequency Domain ◽  
Harmonic Generation ◽  
Measurement Method ◽  
Second Harmonic ◽  
Angle Measurement ◽  
Laser Source ◽  
Optical Frequency ◽  
Measurable Range

This paper proposes a new optical angle measurement method in the optical frequency domain based on second harmonic generation with a mode-locked femtosecond laser source by making use of the unique characteristic of the high peak power and wide spectral range of the femtosecond laser pulses. To get a wide measurable range of angle measurement, a theoretical calculation for several nonlinear optical crystals is performed. As a result, LiNbO3 crystal is employed in the proposed method. In the experiment, the validity of the use of a parabolic mirror is also demonstrated, where the chromatic aberration of the focusing beam caused the localization of second harmonic generation in our previous research. Moreover, an experimental demonstration is also carried out for the proposed angle measurement method. The measurable range of 10,000 arc-seconds is achieved.

scholarly journals Observation of both second-harmonic and multiphoton-absorption-induced luminescence in ZnO

2006 ◽  
Vol 18 (14) ◽  
pp. 1533-1535 ◽  
Author(s):  
D.C. Dai ◽  
S.J. Xu ◽  
S.L. Shi ◽  
M.H. Xie ◽  
C.M. Che
Keyword(s):  
Second Harmonic ◽  
Multiphoton Absorption

Second-harmonic generation in plasmas produced by femtosecond laser pulses

1991 ◽  
Vol 43 (8) ◽  
pp. 4564-4567 ◽  
Author(s):  
T. Engers ◽  
W. Fendel ◽  
H. Schüler ◽  
H. Schulz ◽  
D. von der Linde
Keyword(s):  
Femtosecond Laser ◽  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses

Tunable second harmonic generation from a Kerr-lens mode-locked Yb:YCa 4 O(BO 3 ) 3 femtosecond laser

2017 ◽  
Vol 26 (4) ◽  
pp. 044202
Author(s):  
Zi-Ye Gao ◽  
Jiang-Feng Zhu ◽  
Zheng-Mao Wu ◽  
Zhi-Yi Wei ◽  
Hao-Hai Yu ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic

X-ray production and second-harmonic generation during femtosecond laser microdrilling

2015 ◽  
Vol 120 (2) ◽  
pp. 409-415 ◽  
Author(s):  
V. M. Gordienko ◽  
I. A. Zhvaniya ◽  
I. A. Makarov
Keyword(s):  
Femtosecond Laser ◽  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
X Ray

scholarly journals Stimulated Raman Microscopy Implemented by Three Femtosecond Laser Sources

2021 ◽  
Vol 255 ◽  
pp. 06003
Author(s):  
Rajeev Ranjan ◽  
Maria Antonietta Ferrara ◽  
Luigi Sirleto
Keyword(s):  
Femtosecond Laser ◽  
Stimulated Raman Scattering ◽  
Second Harmonic ◽  
Laser Beams ◽  
Raman Gain ◽  
Harmonic Generator ◽  
Second Harmonic Generator ◽  
Laser Sources ◽  
Fingerprint Region ◽  
Stimulated Raman

In this work, the implementation of a femtosecond Stimulated Raman Scattering microscope, equipped with three femtosecond laser sources: a Titanium-Sapphire (Ti:Sa), an optical parametric oscillator (OPO), and a second harmonic generator (SHG); is presented. Our microscope is designed so that it can cover all the regions of Raman spectra, taking advantage of two possible laser combinations. The first, Ti:Sa and OPO laser beams, which cover the C-H region (>2800 cm-1 ) in stimulated Raman gain (SRG) modality, whereas the second, Ti:Sa and SHG laser beams, covering the C-H region and the fingerprint region in stimulated Raman losses (SRL) modality. The successful realization of the microscope is demonstrated, reporting images of polystyrene beads using both SRL and SRG modalities.

scholarly journals Frequency Doubled CO2 Laser Induced Decomposition of Carbonyl Compounds: Cyclobutanone

1984 ◽  
Vol 4 (1-6) ◽  
pp. 275-285 ◽  
Author(s):  
Mei-Kuen Au ◽  
P. A. Hackett ◽  
M. Humphries ◽  
P. John
Keyword(s):  
Carbonyl Compounds ◽  
Carbon Dioxide Laser ◽  
Second Harmonic ◽  
Multiphoton Absorption ◽  
Carbonyl Groups ◽  
Cyclic Ketones ◽  
Acyl Chlorides ◽  
Frequency Coverage ◽  
Product Array ◽  
Induced Decomposition

This paper reports the first use of radiation derived from a TEA carbon dioxide laser by nonlinear upshifting techniques (second harmonic generation) in initiating multiphoton absorption and dissociation. The frequency doubled CO2 laser has frequency coverage from 2180–1750 cm–1. This frequency region is of importance as it allows pumping of the fundamental stretching modes of organic carbonyl groups (anhydrides, acyl chlorides and strained cyclic ketones), inorganic carbonyl groups, and carbontritium bonds. The laser has been used to excite cyclobutanone in the region of the carbonyl stretch. Efficient multiphoton absorption and two channel dissociation are observed. The product array is consistent with that observed upon excitation at 10 μm.

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.

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