Open AccessPhase-matched frequency conversion below 150 nm in KBe_2BO_3F_2
Author(s) -
Tomoharu Nakazato,
Isao Itō,
Yohei Kobayashi,
Xiaoyang Wang,
Chuangtian Chen,
S. Watanabe
Publication year - 2016
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.24.017149
Subject(s) - phase matching , optics , sapphire , second harmonic generation , sum frequency generation , materials science , nonlinear optics , wavelength , high harmonic generation , laser , phase (matter) , harmonic , radiation , frequency conversion , spectral line , physics , electrical engineering , quantum mechanics , astronomy , engineering
Sum frequency mixing has been demonstrated below 150 nm in KBeBO 3 F 2 by using the fundamental with its fourth harmonic of a 6 kHz Ti: sapphire laser system. The wavelength of 149.8 nm is the shortest ever obtained to our knowledge by phase matching in nonlinear crystals. The output powers were 3.6 μW at 149.8 nm and 110 μW at 154.0 nm, respectively. The phase matching angles measured from 149.8 to 158.1 nm are larger by 3-4 degrees than those expected from the existing Sellmeier equation. The measured transmission spectra of KBeBO 3 F 2 crystals support the generation of coherent radiation below 150 nm.