Electro-Optic Measurement Using High-Quality 4-dimethylamino-N-methyl-4-stilbazolium Tosylate(DAST) Crystal.

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  • Adachi Hiroaki
    Department of Electrical Engineering and Venture Business Laboratory, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
  • Nagaoka Kazuaki
    Department of Electrical Engineering and Venture Business Laboratory, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
  • Tsunesada Fumi
    Department of Electrical Engineering and Venture Business Laboratory, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
  • Yoshimura Masashi
    Department of Electrical Engineering and Venture Business Laboratory, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
  • Mori Yusuke
    Department of Electrical Engineering and Venture Business Laboratory, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
  • Sasaki Takatomo
    Department of Electrical Engineering and Venture Business Laboratory, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
  • Sasaki Ai-ichiro
    NTT Microsystem Integration Laboratories, NTT Corporation, 3-1 Morinosato, Wakamiya, Atsugi, Kanagawa 243-0198, Japan
  • Nagatsuma Tadao
    NTT Microsystem Integration Laboratories, NTT Corporation, 3-1 Morinosato, Wakamiya, Atsugi, Kanagawa 243-0198, Japan
  • Ochiai Yuta
    Synthesis Technology Research Laboratories, Daiichi Pure Chemicals Co., Ltd., 2117 Muramatsu, Tokai, Ibaraki 319-1182, Japan
  • Fukasaku Noboru
    Synthesis Technology Research Laboratories, Daiichi Pure Chemicals Co., Ltd., 2117 Muramatsu, Tokai, Ibaraki 319-1182, Japan

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We evaluated the electro-optic (EO) properties of 4-dimethylamino-N-methyl-4-stilbazolium tosylate (DAST) crystals by external EO probing. The EO signal power obtained from the DAST crystal increased by 8 dB compared to that obtained from the KTiOPO4 (KTP) crystal at 90 kHz. The larger EO signal power obtained from the DAST crystal was almost constant at low frequencies (30 Hz to 90 kHz), whereas the KTP crystal could not respond below 180 Hz. We also observed excellent signals at all measured points due to the high crystallinity of the crystal grown by the slope nucleation method (SNM).

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