Real-time holographic gratings recorded in Norland Optical Adhesive 65 and yellow eosin

We recorded real time holographic gratings in a photosensitive liquid material. This material is Norland Optical Adhesive (NOA 65®) mixed with yellow eosin dye. The NOA 65® is a clear, colorless, liquid photopolymer that cures when is exposed to ultraviolet light (UV) but when is mixed with yellow eosin becomes sensitive to visible region. To record the gratings we used the interference between two diode laser, obtaining gratings by refraction index changes. We use two different wavelengths, for recording the gratings and its highest diffraction efficient was obtained when the grating was illuminated with a wavelength.