Structural modifications induced by ultrafast IR laser pulses in sapphire

2019 ◽  
Author(s):  
Lingfei JI ◽  
Amina ◽  
Muhammad Uzair ◽  
Tianyang Yan
Keyword(s):  
Laser Pulses ◽  
Structural Modifications ◽  
Ir Laser

scholarly journals 25 TW, two-cycle IR laser pulses via frequency domain optical parametric amplification

2017 ◽  
Vol 25 (22) ◽  
pp. 27706 ◽  
Author(s):  
V. Gruson ◽  
G. Ernotte ◽  
P. Lassonde ◽  
A. Laramée ◽  
M. R. Bionta ◽  
...  
Keyword(s):  
Frequency Domain ◽  
Laser Pulses ◽  
Parametric Amplification ◽  
Optical Parametric Amplification ◽  
Ir Laser ◽  
Optical Parametric

scholarly journals Generation of 16 Micrometer IR Laser by theOptical Pumping of CF4 Gas Molecules

2008 ◽  
Vol 5 (3) ◽  
pp. 457-459
Author(s):  
Baghdad Science Journal
Keyword(s):  
Co2 Laser ◽  
Optical Pumping ◽  
Laser Action ◽  
Laser Pulses ◽  
Tea Co2 Laser ◽  
Ir Laser ◽  
Gas Molecules ◽  
Output Laser

We report here the observation of 16 µm superradiance laser action generated from optical pumping of CF4 gas molecules (which is cooled to 140 Kº by a boil-off liquid-N2) by a TEA-CO2 laser 9R12 line. Output laser pulses of 7 mJ and 200 ns have been obtained.

A New Way To Detect Noncovalently Bonded Complexes of Biomolecules from Liquid Micro-Droplets by Laser Mass Spectrometry

2006 ◽  
Vol 59 (2) ◽  
pp. 109 ◽  
Author(s):  
Nina Morgner ◽  
Hans-Dieter Barth ◽  
Bernhard Brutschy
Keyword(s):  
Mass Spectrometry ◽  
Quantitative Analysis ◽  
Liquid Phase ◽  
Laser Pulses ◽  
Laser Mass Spectrometry ◽  
Native Solution ◽  
On Demand ◽  
Ir Laser ◽  
Intensity Threshold ◽  
Wide Range

A new version of laser mass-spectrometry is presented, which allows the quantitative analysis of specific biocomplexes in native solution. On-demand micro droplets, injected into vacuum, are irradiated by mid IR-laser pulses. Above a certain intensity threshold they explode due to the transmitted energy, setting free a fraction of the charged biomolecules which are then mass-analyzed. Amounts of analyte in the attomolar range may be detected with the ion intensity being linear over a wide range of molarity. Evidence is given that this method is soft, tolerant against various buffers, reflects properties of the liquid phase, and suitable for studying noncovalently bonded specific complexes. This is highlighted by results from antibiotics specifically binding into the minor groove of duplex DNA.

Effect of absorbing coating on ablation of diamond by IR laser pulses

2018 ◽  
Vol 48 (3) ◽  
pp. 244-250 ◽  
Author(s):  
T V Kononenko ◽  
P A Pivovarov ◽  
A A Khomich ◽  
R A Khmel'nitskii ◽  
V I Konov
Keyword(s):  
Laser Pulses ◽  
Ir Laser

Parametric studies on generation of short CO2 laser pulses for IR-laser chemistry

2001 ◽  
Vol 42 (6) ◽  
pp. 535-540
Author(s):  
Akshaya K Nayak ◽  
Venkatachari Parthasarathy ◽  
Sisir K Sarkar
Keyword(s):  
Co2 Laser ◽  
Laser Pulses ◽  
Laser Chemistry ◽  
Ir Laser ◽  
Parametric Studies

scholarly journals IR Laser-Induced Changes to L-adrenaline-D-hydrogentartrate Incorporated in KBr Matrices

2002 ◽  
Vol 20 (2-4) ◽  
pp. 89-98
Author(s):  
Tatijana S. Jovanovic ◽  
Milica R. Bogavac ◽  
Bojan B. Radak ◽  
Milan S. Trtica
Keyword(s):  
Carbon Dioxide ◽  
Energy Density ◽  
Laser Energy ◽  
Laser Pulses ◽  
Laser Energy Density ◽  
Cooh Group ◽  
Temporal Shape ◽  
Ir Laser ◽  
Out Of Plane ◽  
Induced Changes

Changes in the pharmaceutical L-adrenaline-D-hydrogentartrate, incorporated in KBr matrices, induced by a pulsed carbon-dioxide Transversely Excited Atmospheric (TEA) laser, were observed. Modifications of the sample were monitored via infrared spectra. Special attention was devoted to the dependence of the sample changes on the laser energy density used. The irradiation of the pharmaceutical has been performed with two laser lines at wavelengths of about 10.6 µm. The laser lines coincide well with the absorption band of the pharmaceutical, which is assigned to the ring vibrations/out-of-plane OH deformation vibrations, within the carboxyl (COOH) group of L-adrenaline-D-hydrogentartrate. Laser energy densities of 1.20 and 1.70 J/cm2 modified the pharmaceutical/compound. It was found that this modification is in essence a thermal effect. The level of change showed a dependence on the laser energy density, number of accumulated laser pulses and temporal shape of the pulse.

Self-Guided Propagation of Ultrashort IR Laser Pulses in Fused Silica

2001 ◽  
Vol 87 (21) ◽  
Author(s):  
S. Tzortzakis ◽  
L. Sudrie ◽  
M. Franco ◽  
B. Prade ◽  
A. Mysyrowicz ◽  
...  
Keyword(s):  
Laser Pulses ◽  
Fused Silica ◽  
Ir Laser ◽  
Guided Propagation

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.

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