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Generation and measurement of >108 intensity contrast ratio in a relativistic kHz chirped-pulse amplified laser |
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| Authors: | K-H Hong B Hou J A Nees E Power G A Mourou |
| Institution: | (1) Center for Ultrafast Optical Science and FOCUS Center, University of Michigan, 2200 Bonisteel Blvd., Ann Arbor, MI48109, USA;(2) Advanced Photonics Research Institute, Gwangju Institute of Science and Technology (GIST), 1 Oryong-dong, Buk-gu, Gwangju, 500-712, Republic of Korea |
| Abstract: | We report on the generation and measurement of a > 108 contrast ratio between main pulse and amplified spontaneous emission (ASE) from a relativistic kHz chirped-pulse amplified laser. We have enhanced the ASE contrast ratio as much as > 400 times by employing a pulse cleaner composed of a μJ preamplifier and a saturable absorber. A third-order cross-correlator with a dynamic range of > 109 and a scanning range of up to 4 ns has been developed for the contrast measurement. Detailed analysis of the cross-correlation trace shows that the random noise of spectral phase generates 20-ps pedestal structure starting from 10−6 level of the main pulse. |
| Keywords: | PACS 42 65 Re 42 25 Kb |
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