Journal
APPLIED PHYSICS LETTERS
Volume 77, Issue 25, Pages 4112-4114Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1329323
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We report guiding of intense (I=1.3 +/-0.7x10(17) W/cm(2)) 80 fs laser pulses with negligible spectral distortion through 1.5-cm-long preformed helium plasma channels. Channels were formed by axicon-focused laser pulses of either 0.3 J energy, 100 ps duration, after preionizing a 200-700 Torr backfill of He gas to n(e)similar to 10(16) cm(-3) with a pulsed electrical discharge; or 0.6-1.1 J energy, 400 ps duration, which required neither preionization nor intentional impurities for seeding. Transverse interferometry showed that He was fully ionized on the channel axis in both cases. Identical femtosecond pulses suffered substantial ionization-induced blueshifts after propagating through Ar and Ne channels of similar dimensions. (C) 2000 American Institute of Physics. [S0003-6951(00)04648-9].
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