New holographic recording material: bromothymol blue dye with rosin

Abstract The characterisation of a solution made up of bromothymol blue (BTB) combined with rosin and diluted in isopropyl alcohol, as a holographic recording material was carried out. This process was based on the recording of diffraction grating, under a range of recording parameters such as: BTB concentration, rosin concentration, a range of interference angles for grating generation, as well as a range of illumination wavelengths, and finally a study of the development process using a range of development times. The holographic gratings produced using this material show a high sensitivity to blue and blueish green illumination (λ=457, 476 and 488 nm), i.e. using an Argon Ion laser as well as a high-spatial resolution of the order of 1100 l/mm, thus demonstrating that it is feasible to obtain other HOEs using the proposed material.