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Spatio-temporal modification of femtosecond focal spot under tight focusing condition
Jeong, Tae Moon,Weber, Stefan,Le Garrec, Bruno,Margarone, Daniele,Mocek, Tomas,Korn, Georg The Optical Society 2015 Optics express Vol.23 No.9
<P>The focusing property of a focal spot of a femtosecond laser pulse is presented under tight focusing conditions (below f-number of 1). The spatial and temporal intensity distributions of a focused electric field are calculated by vector diffraction integrals and coherent superposition method. The validity of the calculation method is examined by comparing the intensity distribution obtained under a high f-number condition to that obtained with the fast Fourier transform method that assumes the scalar paraxial approximation. The spatial and temporal modifications under tight focusing conditions are described for a focused femtosecond laser pulse. The calculation results show that a peak intensity of about 2.5x10(24) W/cm2 can be achievable by tightly focusing a 12-fs, 10 PW laser pulse with a f/0.5 parabolic optic. The precise information on intensity distributions of a femtosecond focal spot obtained under a tight focusing condition will be crucial in assessing a focused intensity and in describing the motion of charged particles under an extremely strong electric field in ultra-relativistic and/or relativistic laser matter-interaction studies.</P>
Generation of Radially or Azimuthally Polarized Laser Beams in a Yb:YAG Thin-disc Laser
오예진,박인철,박은경,Jiri Muzik,Yuya Koshiba,Pawel Sikocinski,Martin Smrz,Tomas Mocek,정훈,김지원 한국광학회 2024 Current Optics and Photonics Vol.8 No.4
A high-power Yb:YAG thin-disc laser with radial or azimuthal polarization incorporating an intracavity S-waveplate is reported. Depending on the rotational angle of the S-waveplate placed in the cavity, a Yb:YAG thin-disc laser yields 10.8 W and 10.2 W of continuous-wave outputs with radial and azimuthal polarization for an incident pump power of 131 W, corresponding to slope efficiencies of 22.9% and 23.7%, respectively. The output characteristics for each polarization state were investigated in detail by analyzing the insertion loss and the mode overlap efficiency due to the S-waveplate. Further prospects for power scaling will be discussed.
Generation of Radially or Azimuthally Polarized Laser Beams in a Yb:YAG Thin-disc Laser
Ye Jin Oh,In Chul Park,Eun Kyoung Park,Jiri Muzik,Yuya Koshiba,Pawel Sikocinski,Martin Smrz,Tomas Mocek,Hoon Jeong,Ji Won Kim 한국광학회 2024 Current Optics and Photonics Vol.8 No.4
A high-power Yb:YAG thin-disc laser with radial or azimuthal polarization incorporating an intracavity S-waveplate is reported. Depending on the rotational angle of the S-waveplate placed in the cavity, a Yb:YAG thin-disc laser yields 10.8 W and 10.2 W of continuous-wave outputs with radial and azimuthal polarization for an incident pump power of 131 W, corresponding to slope efficiencies of 22.9% and 23.7%, respectively. The output characteristics for each polarization state were investigated in detail by analyzing the insertion loss and the mode overlap efficiency due to the S-waveplate. Further prospects for power scaling will be discussed.