Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Keiichi Horimoto and Takahiro Tsukada and Yasuhiro Noi and Toru Mizunami,Second-order nonlinearity and phase matching in thermally poled twin-hole fiber,SPIE Proceedings,0277-786X,SPIE,2004-06-14,5350,,115,https://cir.nii.ac.jp/crid/1874242817758040192,https://doi.org/10.1117/12.528490