High-quality organic 4-dimethylamino-N-methyl-4-stilbazolium tosylate (DAST) crystals for THz wave generation

Hiroaki Adachi, Tetsuo Taniuchi, Masashi Yoshimura, Srinivasan Brahadeeswaran, Teruaki Higo, Masayuki Takagi, Yusuke Mori, Takatomo Sasaki, Hachiro Nakanishi

Research output: Contribution to journalArticlepeer-review

46 Citations (Scopus)


Using the Slope Nucleation Method (SNM) and highly purified materials along with an optimized growth program, we produced high-quality organic 4-dimethylamino-N-methyl-4-stilbazolium tosylate (DAST) crystals. The growth method greatly improved crystallinity. The difference frequency mixing, based on the KTiOPO4 (KTP)-optical parametric oscillator (OPO), generated a coherent, tunable, THz wave in the range of 2 to 30 THz using DAST crystals. These superior DAST crystals also extended the THz generation time. We achieved a constant THz energy output for over 10 h, whereas conventional DAST crystals had reduced the THz wave output in less than 1 hour. We anticipate increased use of DAST crystals for THz generation because of superior performance.

Original languageEnglish
Pages (from-to)L1121-L1123
JournalJapanese Journal of Applied Physics, Part 2: Letters
Issue number8 B
Publication statusPublished - 2004 Aug 15
Externally publishedYes


  • Crystal growth
  • DAST
  • Nonlinear optics
  • Organic material
  • Terahertz generation

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)


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