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Applied Physics Letters / Volume 99 / Issue 25 / LASERS, OPTICS, AND OPTOELECTRONICS

Appl. Phys. Lett. 99, 251101 (2011); http://dx.doi.org/10.1063/1.3666855 (3 pages)

Tunable and collimated terahertz radiation generation by femtosecond laser pulses

Hitendra K. Malik and Anil K. Malik

Department of Physics, Indian Institute of Technology Delhi, New Delhi – 110 016, India

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(Received 28 August 2011; accepted 16 November 2011; published online 19 December 2011)

A mechanism is proposed for the generation of tunable terahertz (THz) radiation under the application of two femtosecond laser pulses and an external magnetic field, where quick tunnel ionization is achieved that leads to higher plasma density evolution and large residual current for the efficient THz radiation generation. With the optimization of magnetic field, phase difference, and amplitudes of lasers’ fields, a THz source can be obtained with tunable frequency and power along with a control on the direction of radiation emission.

© 2011 American Institute of Physics

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KEYWORDS and PACS

Keywords

high-speed optical techniques, ionisation, plasma density, plasma heating by laser, terahertz wave generation

PACS

  • 42.65.Re

    Ultrafast processes; optical pulse generation and pulse compression

  • 84.40.-x

    Radiowave and microwave (including millimeter wave) technology

  • 52.80.-s

    Electric discharges

  • 52.25.-b

    Plasma properties

  • 52.50.Jm

    Plasma production and heating by laser beams (laser-foil, laser-cluster, etc.)

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3666855

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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