Tight focusing and blue shifting of millijoule femtosecond pulses from a conical axicon amplifier.

نویسندگان

  • W M Wood
  • G Focht
  • M C Downer
چکیده

We focus millijoule femtosecond pulses to a spot radius of 2 microm after amplification free of phase-front distortion in a Nd:YAG-pumped conical axicon dye cell. Peak focal intensities reach 10(16) W/cm(2) , creating an intense spark that is caused by air breakdown at the focus. Intensity-dependent blue shifts of the pulse spectrum as large as 11 nm are observed as a result of temporally asymmetric self-phase modulation in the air-breakdown plasma.

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عنوان ژورنال:
  • Optics letters

دوره 13 11  شماره 

صفحات  -

تاریخ انتشار 1988