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In-situ recorded holographic lenses for near-infrared diode lasers

In the present work, we use a holographic material sensitized in the near-infrared (850 nm) region for in-situ recording a hologram, which is then used for focusing a near infrared laser beam. The holographic lens was fabricated using a Holographic Photopolymer Dispersed Liquid Crystal (H-PDLC) a mixture of an acrylate monomer, near infrared photosensitizing complex and different liquid crystals. Two approaches, involving these H-PDLCs, are used to create the holographic lens. First we utilize a Titanium-Sapphire laser (pumped by a Verdi laser) beam in order to demonstrate the efficiency of the approach. Secondly we fabricate another holographic lens by means of a commercial diode laser operating at 830 nm. Different characteristics of the recorded holograms, such as their angular and position tolerance, focal length, beam profile, are studied. Aberrations such as chromatic aberration, spherical aberration, astigmatism and comas are also analyzed.