• High Power Laser Science and Engineering
  • Vol. 9, Issue 4, 04000e54 (2021)
Andrey Shaykin, Vladislav Ginzburg, Ivan Yakovlev, Anton Kochetkov, Alexey Kuzmin, Sergey Mironov, Ilya Shaikin, Sergey Stukachev, Vladimir Lozhkarev, Artem Prokhorov, and Efim Khazanov*
Author Affiliations
  • Institute of Applied Physics of the Russian Academy of Sciences, Nizhny Novgorod603950, Russia
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    DOI: 10.1017/hpl.2021.40 Cite this Article
    Andrey Shaykin, Vladislav Ginzburg, Ivan Yakovlev, Anton Kochetkov, Alexey Kuzmin, Sergey Mironov, Ilya Shaikin, Sergey Stukachev, Vladimir Lozhkarev, Artem Prokhorov, Efim Khazanov. Use of KDP crystal as a Kerr nonlinear medium for compressing PW laser pulses down to 10 fs[J]. High Power Laser Science and Engineering, 2021, 9(4): 04000e54 Copy Citation Text show less

    Abstract

    The input pulse of the laser PEARL with energy of 18 J and pulse duration of about 60 fs was compressed to 10 fs after passage through a 4-mm-thick KDP crystal and reflection at two chirped mirrors with sum dispersion of -200 fs2. The experiments were performed for the В-integral values from 5 to 19 without visible damage to the optical elements, which indicates that small-scale self-focusing is not a significant issue. It was shown that, by virtue of the low dispersion of the group velocity, the KDP crystal has some advantages over silica: a larger pulse compression coefficient, especially at a small value of the В-integral (B = 5, …, 9), lower absolute values of chirped mirror dispersion, and also a possibility to control the magnitude of nonlinearity and dispersion by changing crystal orientation.

    1 Introduction

    The power and, hence, the focal intensity of petawatt and multipetawatt lasers are currently limited by the size and damage threshold of compressor diffraction gratings[1]. A multifold power enhancement can be achieved using mosaic gratings in the compressor or several parallel chirped pulse amplification (CPA) channels, each of which ends with a conventional compressor of its own. In these cases, the power of the pulse increases as a result of increasing energy, while its duration remains unchanged. This approach entails a multiple increase in complexity, size, and price. An alternative recently developing approach, within the framework of which power is enhanced due to reduced pulse duration after the compressor, rather than due to energy increase, is free from these drawbacks. This approach has different names/acronyms: thin film compression (TFC)[2], compression after compressor approach (CafCA)[3], or post-compression[4]. The corresponding technique is as follows: the pulse spectrum is broadened as a result of self-phase modulation (SPM) during propagation in a medium with Kerr nonlinearity and is then compressed due to reflection from chirped mirrors (CMs) with negative dispersion.

    Andrey Shaykin, Vladislav Ginzburg, Ivan Yakovlev, Anton Kochetkov, Alexey Kuzmin, Sergey Mironov, Ilya Shaikin, Sergey Stukachev, Vladimir Lozhkarev, Artem Prokhorov, Efim Khazanov. Use of KDP crystal as a Kerr nonlinear medium for compressing PW laser pulses down to 10 fs[J]. High Power Laser Science and Engineering, 2021, 9(4): 04000e54
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