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Efficient Terahertz Pulse Generation in Laser-Induced Gas Plasmas

100%

Löffler T., Kress M., Thomson M., Roskos H.

Acta Physica Polonica A

2005

vol. 107

issue 1

99-108

In this contribution, we review the development of sources for far-infrared (terahertz) radiation based on laser-generated gas plasmas. We describe several generation mechanisms based on ponderomotive forces, external field screening, and optical second-harmonic biasing. These methods are compared with the standard techniques with respect to the achievable terahertz pulse energy.

Few-Cycle Laser Pulses: The Carrier-Envelope Phase, Its Role in the THz Emission from Laser-Generated Plasmas and a New Way to Measure It

52%

Kress M., Löffler T., Thomson M., Roskos H., Dörner R., Gimpel H., Zrost K., Ergler T., Moshammer R., Morgner U., Ullrich J.

Acta Physica Polonica A

2008

vol. 113

issue 3

769-776

Terahertz emission from laser-generated air plasmas has recently been identified as an interesting source for THz radiation. High intensities and a large bandwidth of the THz pulses can be achieved. We briefly review several mechanisms which were employed to generate the quasi-static dipole moment needed for the optical rectification process. This leads us to a discussion of a specific application of THz emission from an air plasma, namely the investigation of the carrier-envelope phase of few-cycle optical pulses. Such pulses of a duration of less than 10 fs induce a spatial charge asymmetry in the plasma directly via non-linear tunneling ionization. The asymmetry, and with it the emission of the THz radiation from the plasma, depend on the carrier-envelope phase, with the consequence that one can determine the phase by measurement of the amplitude and polarity of the THz pulse.

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2 Acta Physica Polonica A

1 2008

1 2005

2 Kress M.

2 Löffler T.

2 Roskos H.

2 Thomson M.

1 Dörner R.

1 Ergler T.

1 Gimpel H.

1 Morgner U.

1 Moshammer R.

1 Ullrich J.

1 Zrost K.

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Efficient Terahertz Pulse Generation in Laser-Induced Gas Plasmas

Few-Cycle Laser Pulses: The Carrier-Envelope Phase, Its Role in the THz Emission from Laser-Generated Plasmas and a New Way to Measure It