Guiding of high intensity ultrashort laser pulses in plasma channels produced with the dual laser pulse Ignitor-Heater technique.

Journal Article · Thu Jul 01 04:00:00 EDT 1999 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.58867· OSTI ID:692540

Volfbeyn, P; Leemans, W P ^[1]

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1. LBNL, Berkeley, California 94720 (United States)

We present results of experimental investigations of laser guiding in plasma channels. A new technique for plasma channel creation, the Ignitor-Heater scheme is proposed and experimentally tested in hydrogen and nitrogen. It makes use of two laser pulses. The Ignitor, an ultrashort ({lt}100 fs) laser pulse, is brought to a line focus using a cylindrical lens to ionize the gas. The Heater pulse (160 ps long) is used subsequently to heat the existing spark via inverse Bremsstrahlung. The hydrodynamic shock expansion creates a partially evacuated plasma channel with a density minimum on axis. Such a channel has properties of an optical waveguide. This technique allows creation of plasma channels in low atomic number gases, such as hydrogen, which is of importance for guiding of highly intense laser pulses. The channel density was diagnosed with time resolved longitudinal interferometry. From these measurements the plasma temperature was inferred. The guiding properties of the channels were tested by injecting a {gt}5{times}10{sup 17}&hthinsp;W/cm{sup 2}, 75 fs laser pulse. {copyright} {ital 1999 American Institute of Physics.}

• Sponsoring Organization: USDOE
• OSTI ID: 692540
• Report Number(s): CONF-980742--
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 472; ISSN 0094-243X; ISSN APCPCS
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BEAM DYNAMICS
BEAT WAVE ACCELERATORS
ELECTRON BEAMS
LASER RADIATION
LIGHT TRANSMISSION
LINEAR ACCELERATORS
PLASMA
PULSE TECHNIQUES
WAKEFIELD ACCELERATORS