We demonstrate intense pulse guiding in efficient femtosecond end-pumped waveguides generated in clustered gases. This novel scheme provides a route to significantly lower on-axis plasma density (<10¹⁸ cm^-3) more than is feasible in conventional hydrodynamic plasma waveguides. Self-focused propagation and strong absorption of intense femtosecond laser pulses are used to produce long centimeter scale channels in an argon cluster jet, and a subsequent pulse is guided with 3×10¹⁷ W cm^-2 intensity and ~50% coupling efficiency. Preliminary results with hydrogen clusters also show guiding.
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Kumarappan et al. (2005) studied this question.
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