High temporal contrast frontend with optical parametric amplifier for high powerful femtosecond laser

Li, Yanyan; Guo, Xiaotong; Zou, Xiao Ping; Xu, Yi; Leng, Yuxin

doi:10.1016/j.optlastec.2013.10.012

Cited by 3 publications

(1 citation statement)

References 16 publications

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“…Pulse contrasts of several ultrafast lasers have been improved to 10 -11 by using double chirped-pulse amplifier and cross-polarized wave [5][6][7][8], or saturable absorber [9]. In addition, pulse contrasts of frontends in Orion and PHELIX facilities achieve 10 -11 by using short pulse optical parametric amplifiers [10,11].…”

Section: Introductionmentioning

confidence: 99%

Diagnostics of pulse contrast for petawatt laser in SGII

et al. 2015

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Pulse contrast is an important parameter for ultrafast pulses. It shall be 10 8 or higher in order to avoid effect from noise before main pulse. Diagnostics with cross-correlation can achieve high temporal resolution such as ~7fs.Cross-correlation has advantage in pulse contrast measurement than autocorrelation because it can distinguish noise before or after main pulse. High dynamic range is also essential in pulse contrast measurement. Cross-correlation signal from a single shot is converted into a signal series through fiber array, which can be analyzed by a set of a PMT and an oscilloscope. Noise from nonlinear crystal and scatter needs decrease to improve dynamic range. And pulse power is also discussed in pulse contrast experiments. Time delay τ is generated by travel stage in measurement for repetition pulses.Then energy instability will generate error in this measurement. In measurement for single shot pulse, time delay τ is generated by slant angle of beams. The scanning procession is completed with thousands parts of beam section within a single shot, and error will generated from no uniformity in near field. Performance test of pulse contrast measurement is introduced in subsequent sections. Temporal resolution is testified by self-calibration. Dynamic range is judged by a parallel flat. At last pulse contrast of petawatt laser is diagnosed by a single shot cross-correlator with high confidence. The ratio is 10 -6 at 50ps before main pulse, and 10 -4 at 10ps before main pulse.

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Section: Introductionmentioning

confidence: 99%

Diagnostics of pulse contrast for petawatt laser in SGII

et al. 2015

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Experimental demonstration of broadband femtosecond optical parametric amplification based on YCOB crystal at near critical wavelength degeneracy

Guo

Leng

et al. 2016

Optics Communications

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High efficiency cross-polarized wave filter for non-vacuum transmission

Rong-Feng¹,

Xing-Tai²,

Yan-Ying³

et al. 2017

Acta Phys. Sin.

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Development of high-peak power laser system encounters difficulties in producing the pulses with high temporal contrast. To increase the pulse temporal contrast ratio, a nonlinear filter based on crossed-polarized wave (XPW) generation is proposed. The XPW generation relies on a third-order nonlinear process occurring in a nonlinear medium, such as barium fluorite (BaF2) crystal. The XPW process is quite straightforward:a linearly polarized laser pulse is focused on BaF2 crystal positioned between two orthogonally polarizers, high power main pulses due to nonlinear polarization rotation can pass through the second polarizer, while low power unconverted pre-and post-pulses are filtered by the second polarizer. With the XPW technique, pulse contrast can be enhanced by several orders of magnitude. Furthermore, XPW spectrum can be broaden by a factor with respect to the initial spectrum. This efficient pulse cleaner presents many advantages and has proved to be a simple and reliable pulse filter operating in a double chirped pulse amplification system. Most of previous XPW experiments utilize short focal systems or work off focus due to an intensity limit in the crystal (BaF2). These drawbacks result in a lower conversion efficiency (lower than 10%) when using a single crystal. Dual crystal setup is capable of achieving efficiency more than 20%, yet the configuration restricts the crystal separation to a millimeter level. The use of long focus lens in the XPW device is capable of reaching higher efficiency, with BaF2 crystal positioned in the focal plane. Hence for milljoule pulses, the setup distance increases to tens of meters, resulting in a complicated system and cumbersome configuration. Considering these limitations, a compact, highly efficient and stable XPW generation using dual-lens system suitable for non-vacuum transmission is presented. The measured nonlinear accumulated phase shows little deterioration of pulse quality. With a compact dual lens system, we realize an excellent XPW conversion of above 22% (internal efficiency of 30%) with using double BaF2 crystals, while a femtosecond laser pulse can experience a spectrum broadening up to a factor of 1.78. The dual-lens configuration overcomes the crystal separation limit, and conversion efficiency exceeds 20% for a crystal separation from 13 cm to 22 cm, which is conducible to flexibility and robustness. The stability for the setup to generate shorter pulses with very high contrast or compensate for spectral gain narrowing in the preamplifier is ensured due to the dual-lens focusing system.

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High temporal contrast frontend with optical parametric amplifier for high powerful femtosecond laser

Cited by 3 publications

References 16 publications

Diagnostics of pulse contrast for petawatt laser in SGII

Diagnostics of pulse contrast for petawatt laser in SGII

Experimental demonstration of broadband femtosecond optical parametric amplification based on YCOB crystal at near critical wavelength degeneracy

High efficiency cross-polarized wave filter for non-vacuum transmission

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