Open AccessGroup-velocity-matching relation in the mixing process of broadband third-harmonic generation
Author(s) -
Yuexiang Yang,
Wanguo Zheng,
Wei Han,
Che Ya-Liang,
Jichun Tan,
Yang Xiang,
Huiling Jia
Publication year - 2007
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.56.6468
Subject(s) - broadband , group velocity , mixing (physics) , bandwidth (computing) , nonlinear system , physics , energy conversion efficiency , coupling (piping) , optics , mathematical analysis , materials science , optoelectronics , quantum mechanics , mathematics , telecommunications , computer science , metallurgy
Based on the nonlinear coupling equationsthe relation between group-velocities of 1ω2ω and 3ω waves in the mixing process of broadband third-harmonic generation (THG) is investigated theoretically. The formula of three-wave group-velocity-matching (GVM) is derived. The THG mixing process of ultrashort pulses in Type-Ⅱ KDP crystals is simulated. Obtained results show that both the THG conversion efficiency and the bandwidth reach maximum when the formula is satisfied (i.e., at zero group-velocity mismatch)and drop down rapidly when it's not satisfied. The three-wave GVM formula presented is useful for finding proper nonlinear crystals and choosing effective GVM methods.