Multiple Filamentation Effects on THz Radiation Pattern from Laser Plasma in Air

An experimental study of few filaments interaction impact on the terahertz radiation pattern has demonstrated that interaction of two close propagating beams leads to formation of a superfilament-like structure with on-axis terahertz yield. Mutual delay between two beamlets tilts the output intensity front of THz emission.

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Photothermal, Photoelectric, and Photothermoelectric Effects in Bi-Sb Thin Films in the Terahertz Frequency Range at Room Temperature

Photonics ◽

10.3390/photonics8030076 ◽

2021 ◽

Vol 8 (3) ◽

pp. 76

Author(s):

Mikhail K. Khodzitsky ◽

Petr S. Demchenko ◽

Dmitry V. Zykov ◽

Anton D. Zaitsev ◽

Elena S. Makarova ◽

...

Keyword(s):

Thin Films ◽

Terahertz Radiation ◽

Room Temperature ◽

Voltage Drop ◽

Radiation Detection ◽

Radiation Detectors ◽

Thz Radiation ◽

Terahertz Frequency ◽

Frequency Range ◽

Terahertz Frequency Range

The terahertz frequency range is promising for solving various practically important problems. However, for the terahertz technology development, there is still a problem with the lack of affordable and effective terahertz devices. One of the main tasks is to search for new materials with high sensitivity to terahertz radiation at room temperature. Bi1−xSbx thin films with various Sb concentrations seem to be suitable for such conditions. In this paper, the terahertz radiation influence onto the properties of thermoelectric Bi1−xSbx 200 nm films was investigated for the first time. The films were obtained by means of thermal evaporation in vacuum. They were affected by terahertz radiation at the frequency of 0.14 terahertz (THz) in the presence of thermal gradient, electric field or without these influences. The temporal dependencies of photoconductivity, temperature difference and voltage drop were measured. The obtained data demonstrate the possibility for practical use of Bi1−xSbx thin films for THz radiation detection. The results of our work promote the usage of these thermoelectric materials, as well as THz radiation detectors based on them, in various areas of modern THz photonics.

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Experimental study of laser beam transmission and power accounting in a large scale length laser plasma

Physics of Plasmas ◽

10.1063/1.874218 ◽

2000 ◽

Vol 7 (8) ◽

pp. 3388-3398 ◽

Cited By ~ 8

Author(s):

J. D. Moody ◽

B. J. MacGowan ◽

R. L. Berger ◽

K. G. Estabrook ◽

S. H. Glenzer ◽

...

Keyword(s):

Experimental Study ◽

Laser Beam ◽

Laser Plasma ◽

Large Scale ◽

Beam Transmission ◽

Scale Length

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Double-pulse THz radiation bursts from laser-plasma acceleration

Physics of Plasmas ◽

10.1063/1.2366546 ◽

2006 ◽

Vol 13 (11) ◽

pp. 113107 ◽

Cited By ~ 2

Author(s):

R. A. Bosch

Keyword(s):

Laser Plasma ◽

Double Pulse ◽

Thz Radiation ◽

Plasma Acceleration ◽

Laser Plasma Acceleration

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Thermal Analysis of Cornea Heated with Terahertz Radiation

Applied Sciences ◽

10.3390/app9050917 ◽

2019 ◽

Vol 9 (5) ◽

pp. 917

Author(s):

Wenquan Liu ◽

Yuanfu Lu ◽

Rongbin She ◽

Guanglu Wei ◽

Guohua Jiao ◽

...

Keyword(s):

Heat Transfer ◽

Thermal Analysis ◽

Terahertz Radiation ◽

Thermal Effects ◽

Thermal Damage ◽

Treatment Approach ◽

Thz Radiation ◽

Beam Radius ◽

Corneal Tissue ◽

Temperature Distributions

We numerically investigate the thermal effects in a cornea illuminated by terahertz radiation. By modifying the bioheat and Arrhenius equations, we studied the heat-transfer and temperature distributions in the corneal tissue, and evaluated the potential thermal damage. The influence of the beam radius and power density are discussed. We also estimated the effective cornea-collagen shrinkage region, and evaluated the degree of thermal damage in the cornea. We expect this work to open up a novel effective and safe thermal-treatment approach based on THz radiation for cornea reshaping in the field of ophthalmology.

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