Gratings in Structured Optical Fibres

<table>Grating induced into fibre core at 21.5<sup>°</sup> incident
writing beam to the 0<sup>°</sup> axis. Large birefringence is observed (<svg height="16.012501" id="M23" style="vertical-align:-0.1638pt" version="1.1" viewbox="0 0 70.150002 16.012501" width="70.150002" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
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<g transform="matrix(.012,-0,0,-.012,56.775,7.587)"><path d="M535 230h-483v50h483v-50z" id="x2212"></path></g><g transform="matrix(.012,-0,0,-.012,63.76,7.587)"><path d="M456 178h-96v-72q0 -51 12.5 -62.5t72.5 -16.5v-27h-256v27q65 5 78 17t13 62v72h-260v28q182 271 300 426h40v-407h96v-47zM280 225v295h-2q-107 -148 -196 -295h198z" id="x34"></path></g>
</svg>).</table>

Laser Chemistry

Gratings in Structured Optical Fibres

Figure 8