High-repetition-rate grazing-incidence pumped x-ray laser operating at 18.9 nm |
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Authors: | Keenan R Dunn J Patel P K Price D F Smith R F Shlyaptsev V N |
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Institution: | Lawrence Livermore National Laboratory, Livermore, California 94551, USA. |
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Abstract: | We have demonstrated a 10 Hz Ni-like Mo x-ray laser operating at 18.9 nm with 150 mJ total pump energy by employing a novel pumping scheme. The grazing-incidence scheme is described, where a picosecond pulse is incident at a grazing angle to a Mo plasma column produced by a slab target irradiated by a 200 ps laser pulse. This scheme uses refraction of the short pulse at a predetermined electron density to increase absorption to pump a specific gain region. The higher coupling efficiency inherent to this scheme allows a reduction in the pump energy where 70 mJ long pulse energy and 80 mJ short pulse energy are sufficient to produce lasing at a 10 Hz repetition rate. Under these conditions and by optimizing the delay between the pulses, we achieve strong amplification and close to saturation for 4 mm long targets. |
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