@ARTICLE{ iet:/content/journals/10.1049/el_19870239, author = {M.C. Farries}, author = {P.ST.J. Russell}, author = {M.E. Fermann}, author = {D.N. Payne}, keywords = {spectral bandwidth;self written grating;0.5 percent;fused SiO2;second harmonic generation in fibre;second order nonlinear susceptibility grating;SHG;phase-matched generation of second-harmonic;weak non-phase-matched SH signal;axially periodic pattern of colour centres;quadrupole polarisation;mechanism;}, ISSN = {0013-5194}, language = {English}, abstract = {A mechanism for phase-matched generation of second-harmonic (SH) light in an optical fibre has been experimentally and theoretically studied. A weak non-phase-matched SH signal, created via the quadrupole polarisation, initiates the self-writing of an axially periodic pattern of colour centres which is postulated to lead to the growth of a χ (2) grating. The grating (at the phase-match period) gives rise to SH generation at efficiencies of 0.5%. The spectral bandwidth of this χ (2) grating is 0.24 nm.}, title = {Second-harmonic generation in an optical fibre by self-written χ(2) grating}, journal = {Electronics Letters}, issue = {7}, volume = {23}, year = {1987}, month = {March}, pages = {322-324(2)}, publisher ={Institution of Engineering and Technology}, copyright = {© The Institution of Electrical Engineers}, url = {https://digital-library.theiet.org/;jsessionid=4r8if1eblq9nm.x-iet-live-01content/journals/10.1049/el_19870239} }