Ultrafast Time-Resolution and the Beam Quality in Spin-Polarized Pulse-TEM

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  • Kuwahara Makoto
    名古屋大学未来材料・システム研究所 名古屋大学大学院工学研究科
  • Ujihara Toru
    名古屋大学未来材料・システム研究所 名古屋大学大学院工学研究科
  • Asano Hidefumi
    名古屋大学大学院工学研究科
  • Saitoh Koh
    名古屋大学未来材料・システム研究所 名古屋大学大学院工学研究科
  • Tanaka Nobuo
    名古屋大学未来材料・システム研究所 名古屋大学大学院工学研究科

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Other Title
  • スピン偏極パルスTEMにおける超高速時間分解能とそのビーム品質
  • スピンヘンキョク パルス TEM ニ オケル チョウコウソク ジカン ブンカイノウ ト ソノ ビーム ヒンシツ

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Abstract

<p>Pulse beam emission in a spin-polarized pulse-TEM (SP-TEM) was performed using a combination of a semiconductor photocathode and an ultra-short pulse laser, which has an ability of a time-resolved measurement. The photocathode has high quantum efficiency of the order of 10-3 comparing with other metal-type photocathode, which can realized a wide range of the pulse duration from a continuous emission to a pico-second pulse emission. The SP-TEM has several advantages of a high brightness of 3.1×108 A/cm2・sr, a narrow energy width of 114 meV and a long coherence length of 150 nm. In a pulse-mode operation, a pico-second pulse duration was realized with a newly developed ultra-short pulse laser system which consists of a mode-lock Ti-Sapphire laser, a compensator of a group velocity dispersion and a pulse-duration converter. Time-resolved TEM imaging and pulsed interference fringes were also conducted successfully with a stroboscopic acquisition technique. Consequently, in spite of a high current density, the pulsed electron beam emitted from the photocathode has enough coherence to realize a time-resolved holography that can observe phase information in a temporal space.</p>

Journal

  • KENBIKYO

    KENBIKYO 50 (3), 151-155, 2015-12-30

    The Japanese Society of Microscopy

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