Summary
We experimentally demonstrate the amplification of optical-fieldionization soft x-ray lasers in krypton cluster jets at pump energy of only 200 mJ. With the employment of small f-number optics, nature diffraction and ionizationinduced refraction in plasmas can be suppressed to enable the pump pulse producing a longer column of gains provided the focal position is optimized. A simple wave propagation code is developed to study and optimize the laser propagation in optical-field driven plasmas. Good agreements between experimental observations and simulations are found. The further enhancement of Kr x-ray laser output at 32.8 nm is achieved by guiding the pump beam in the optically preformed plasma waveguide. More than 4 times of x-ray photons are generated from pure Kr plasma waveguide at the same pump energy. Significant reductions of the pump energy make these pumping configurations favorable for practical high-repetitionrate operations.
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Chou, MC., Hung, TS., Lin, JY., Lin, PH., Chen, SY., Wang, J. (2007). Generation of Efficient Optical-Field-Ionization X-Ray Lasers in Cluster Jets. In: Nickles, P., Janulewicz, K. (eds) X-Ray Lasers 2006. Springer Proceedings in Physics, vol 115. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-6018-2_28
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DOI: https://doi.org/10.1007/978-1-4020-6018-2_28
Publisher Name: Springer, Dordrecht
Print ISBN: 978-1-4020-6017-5
Online ISBN: 978-1-4020-6018-2
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