Open AccessCompensation of group velocity mismatching of three pulses in femtosecond optical parametric amplification
Author(s) -
Jing Ma,
Ruobing Zhang,
Weili Zhang,
Qingyue Wang
Publication year - 2005
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.54.755
Subject(s) - femtosecond , optics , optical parametric amplifier , group velocity , parametric statistics , physics , phase matching , pulse (music) , phase (matter) , bandwidth (computing) , wavelength , laser , materials science , optical amplifier , mathematics , telecommunications , computer science , statistics , quantum mechanics , detector
For avoiding adverse effect arising from group velocity mismatching in parametri c amplification, a new method is presented, in which we combine pulse front slan t and noncollinear phase matching to completely compensate group velocity mismat ching of three pulses, in femtosecond optical parametric amplification (OPA). Th e change of the phase matching angle, the pulse front slant angle and the noncol linear angle with the signal wavelength are calculated, when group velocity matc hing of three pulses is achieved in BBO crystal type_Ⅰ and typeⅡ phase matching configurations. The effect of group velocity matching of three pulses on the spatial walk_off length, the parametric gain and the parametric bandwidth is analyzed. The results indicate that, using this method can make matching of gro up velocities of three pulses, when tuned continuously in both BBO type_I and Ⅱ phase matching femtosecond OPA, and thus the effective interaction length of th ree pulses is increased considerably. This calculation method and the analysis r esults provided a theoretical guidance for obtaining parametric pulses with high er gain and shorter duration.