Overwrite LPG fabrication data vs model

The transmission spectra of a 40 mm 109.5 µm period LPG during fabrication, recorded after 1, 2, 3, 4, 5, 6, 7 and 8 cycles of 5s exposures.The modelled spectra of an LPG with 109.5 um period with increasing delta. Using the approach of Erdogan, the coupled mode equations were solved numerically to allow the transmission spectrum of the LPG to be simulated, where the value of dncore varies from 2x10-6 to 3x10-5 in steps of 4x10-6, showing good agreement with the form of the experimental data. Data all included showing the tracked position of the LP18 band both in wavelength and intensity.