19 December 2003 Approaching the transform limit for x-ray laser pulses
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Below saturation, X-ray laser output shows a reduction in pulse duration and frequency bandwidth as the gain-length product increases. Above saturation, both quantities can be expected to rebroaden. The duration of gain can be close to an order-of-magnitude longer than the output pulse duration. With gain-length products just below saturation, X-ray lasing at 13.9 nm in nickel-like silver has been measured with a pulse duration Δt of 3 - 4 ps and an estimated frequency bandwidth Δv of 5×1011 Hz. Such values imply that the pulses are close to transform limited with Δt Δv ≈ 1.5. Measurements of x-ray laser pulse-lengths and gain duration will described in this paper.
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Greg J. Tallents, Greg J. Tallents, Yousef Abou-Ali, Yousef Abou-Ali, Matthew Edwards, Matthew Edwards, Quanli Dong, Quanli Dong, Pritesh Mistry, Pritesh Mistry, Geoffrey J. Pert, Geoffrey J. Pert, Arif Demir, Arif Demir, Ciaran L. S. Lewis, Ciaran L. S. Lewis, Annie Klisnick, Annie Klisnick, Philippe Zeitoun, Philippe Zeitoun, "Approaching the transform limit for x-ray laser pulses", Proc. SPIE 5197, Soft X-Ray Lasers and Applications V, (19 December 2003); doi: 10.1117/12.505912; https://doi.org/10.1117/12.505912

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