Phase-matched frequency conversion below 150 nm in KBe_2BO_3F_2 Nakazato, Tomoharu ; Ito, Isao ; Kobayashi, Yohei ; Wang, Xiaoyang ; Chen, Chuangtian ; Watanabe, Shuntaro Abstract Publication: Optics Express Pub Date: July 2016 DOI: 10.1364/OE.24.017149 Bibcode: 2016OExpr..2417149N