Open AccessEXPERIMENT AND THEORY ON DIFFRACTION FROM LASER-INDUCED PHASE-HOLE IN POLYMER FI LM
Author(s) -
Liyong Ren,
Baoli Yao,
Xun Hou,
Wenhui Yi,
Minqiang Wang
Publication year - 2000
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.49.1973
Subject(s) - diffraction , optics , beam (structure) , laser , materials science , phase (matter) , fresnel diffraction , laser beam quality , laser beams , physics , quantum mechanics
Concentric diffraction rings with bright center in the far field and dark center in the near field of the probe beam were experimentally observed when a strong pump laser beam (526nm) and a weak probe laser beam (632.8nm) cross under the no nlinear medium film (Polypyrrylarylenemethine/polyvinyl film).Based on Fresnel-K irchhoff diffraction integral equation,this phenomenon can be explained by the d iffraction effect of the probe beam from the laser-induced phase-hole in the non linear medium caused by the pump beam.The numeric calculations give good agreeme nt with the experimental results.