scholarly journals Radiative contribution to thermal grating decay

2021 ◽  
Vol 130 (20) ◽  
pp. 205103
Author(s):  
A. A. Maznev ◽  
S. G. Robertson ◽  
M. P. Short ◽  
K. A. Nelson
Keyword(s):  
Thermal Grating

scholarly journals Laser-induced thermal grating spectroscopy based on femtosecond laser multi-photon absorption

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Maria Ruchkina ◽  
Dina Hot ◽  
Pengji Ding ◽  
Ali Hosseinnia ◽  
Per-Erik Bengtsson ◽  
...  
Keyword(s):  
Continuous Wave ◽  
Laser Pulses ◽  
Photon Absorption ◽  
Gas Flows ◽  
Single Shot ◽  
Photon Excitation ◽  
Fs Laser ◽  
Thermal Grating ◽  
Grating Spectroscopy ◽  
First Time

AbstractLaser-induced grating spectroscopy (LIGS) is for the first time explored in a configuration based on the crossing of two focused femtosecond (fs) laser pulses (800-nm wavelength) and a focused continuous-wave (cw) laser beam (532-nm wavelength). A thermal grating was formed by multi-photon absorption of the fs-laser pulses by $$\hbox {N}_{{2}}$$ N 2 with a pulse energy around 700 $$\upmu $$ μ J ($$\sim $$ ∼ 45 TW/$$\hbox {cm}^{2}$$ cm 2 ). The feasibility of this LIGS configuration was investigated for thermometry in heated nitrogen gas flows. The temperature was varied from room temperature up to 750 K, producing strong single-shot LIGS signals. A model based on the solution of the linearized hydrodynamic equations was used to extract temperature information from single-shot experimental data, and the results show excellent agreement with the thermocouple measurements. Furthermore, the fluorescence produced by the fs-laser pulses was investigated. This study indicates an 8-photon absorption pathway for $$\hbox {N}_{{2}}$$ N 2 in order to reach the $$\hbox {B}^{3}\Pi _{g}$$ B 3 Π g state from the ground state, and 8 + 5 photon excitation to reach the $$\hbox {B}^{2}\Sigma _{u}^{+}$$ B 2 Σ u + state of the $$\hbox {N}_{2}^{+}$$ N 2 + ion. At pulse energies higher than 1 mJ, the LIGS signal was disturbed due to the generation of plasma. Additionally, measurements in argon gas and air were performed, where the LIGS signal for argon shows lower intensity compared to air and $$\hbox {N}_{{2}}$$ N 2 .

scholarly journals Interface thermal behavior in nanomaterials by thermal grating relaxation

2019 ◽  
Vol 131 ◽  
pp. 932-943 ◽  
Author(s):  
Pier Luca Palla ◽  
Sonia Zampa ◽  
Evelyne Martin ◽  
Fabrizio Cleri
Keyword(s):  
Thermal Behavior ◽  
Thermal Grating

Free-carrier and thermal grating effects in gallium phosphide

1992 ◽  
Vol 5 (12) ◽  
pp. 647-649 ◽  
Author(s):  
T. Shimura ◽  
S. A. Boothroyd ◽  
J. Chrostowski
Keyword(s):  
Gallium Phosphide ◽  
Free Carrier ◽  
Thermal Grating

scholarly journals Mid-Infrared Pumped Laser-Induced Thermal Grating Spectroscopy for Detection of Acetylene in the Visible Spectral Range

2016 ◽  
Vol 70 (6) ◽  
pp. 1034-1043 ◽  
Author(s):  
Anna-Lena Sahlberg ◽  
Johannes Kiefer ◽  
Marcus Aldén ◽  
Zhongshan Li
Keyword(s):  
Spectral Range ◽  
Visible Spectral Range ◽  
Mid Infrared ◽  
Thermal Grating ◽  
Grating Spectroscopy

Laser-induced thermal grating effects in flames

1994 ◽  
Vol 19 (21) ◽  
pp. 1681 ◽  
Author(s):  
Skip Williams ◽  
Richard N. Zare ◽  
Larry A. Rahn ◽  
Phillip H. Paul ◽  
Jon W. Forsman
Keyword(s):  
Thermal Grating

scholarly journals AN INVESTIGATION OF LASER INDUCED THERMAL GRATING IN LIQUID CRYSTAL

1984 ◽  
Vol 33 (4) ◽  
pp. 568
Author(s):  
ZHU HUA-NAN ◽  
MI XIN ◽  
YU ZU-HE ◽  
JIN FU-HUI ◽  
FU PAN-MING
Keyword(s):  
Liquid Crystal ◽  
Thermal Grating
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