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We propose Type-II SHG-autocorrelation as a simple and robust tool for high-dynamic range pulse-contrast measurements of sub-μJ energy, high-repetition rate pulses. We demonstrate dynamic ranges of the autocorrelation of over 10^7 with input energies of 55 nJ at 1 MHz repetition rate. The device allows temporal resolutions of 25 fs over a wide scanning range of 1100 ps, supporting input wavelengths from 700-1200 nm. The technique provides the perfect tool for wide use pulse-contrast measurement and optimization, possibly enabling a more effective use of pulse energy in peak power driven material processing applications.
Matthias Baudisch,Mateusz Ibek,Edlef Büttner, andPeter Staudt
"High-dynamic range pulse-contrast measurements for wide use in scientific applications and laser development", Proc. SPIE PC11991, Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XXII, PC119910S (1 April 2022); https://doi.org/10.1117/12.2607732
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Matthias Baudisch, Mateusz Ibek, Edlef Büttner, Peter Staudt, "High-dynamic range pulse-contrast measurements for wide use in scientific applications and laser development," Proc. SPIE PC11991, Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XXII, PC119910S (1 April 2022); https://doi.org/10.1117/12.2607732