Figure 2

(a) LPG resonance wavelength shift (left axis) and visibility changes (right axis) during the full observation period (both irradiation and relaxation phases); (b) dose absorbed by the grating during the experiment.

(a) LPG resonance wavelength shift (left axis) and visibility changes (right axis) during the full observation period (both irradiation and relaxation phases); (b) dose absorbed by the grating during the experiment.