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Conferences > HILAS > 2012 > HT1C > HT1C.2

Contrast Enhancement for Astra-Gemini Laser

Y. Tang, C. J. Hooker, B. Parry, O. V. Chekhlov, S. Hawkes, K. Ertel, R. Pattathil, and J. Collier

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Abstract

We report on the recent progress in the contrast campaign for Astra-Gemini laser. An extensive experimental study shows that the main contributions to the “coherent” contrast feature come from the stretcher gratings. Implementing higher-quality gratings resulted in a significant contrast enhancement. Further enhancement by 4 orders of magnitude was also demonstrated using double plasma mirrors (DPM). In addition, the replica prepulses were greatly suppressed or eliminated by employing the wedged crystals and optics, providing a very clean laser pulse.

© 2012 Optical Society of America

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