• A K Sharma

      Articles written in Pramana – Journal of Physics

    • Realization of an optical interferometer based on holographic optics for real-time testing of phase objects

      A K Aggarwal Sushil K Kaura D P Chhachhia A K Sharma

      More Details Abstract Fulltext PDF

      The paper describes a simple and cost effective method for the realization of an optical interferometer based on holographic optics, which use minimal bulk optical components. The optical arrangement in the proposed method involves a very simple alignment procedure and inexpensive holographic recording material is used in the formation of holographic optical elements. The proposed interferometer set-up is quite suitable for performing optical test studies on phase (transparent) objects in real-time. Recording schemes for the formation of holographic optical elements and the related technique for the realization of the interferometer set-up along with the experimental results have been presented.

    • A 10-Hz terawatt class Ti:sapphire laser system: Development and applications

      A K Sharma J Smedley T Tsang T Rao

      More Details Abstract Fulltext PDF

      We developed a two-stage Ti:sapphire laser system to generate 16 mJ/80 fs laser pulses at a pulse repetition rate of 10 Hz. The key deriver for the present design is implementing a highly efficient symmetric confocal pre-amplifier and employing a simple, inexpensive synchronization scheme relying only on a commercial digital delay generator. We characterized the amplified pulses in spatial, spectral and temporal domains. The laser system was used to investigate various nonlinear optical processes, and to modify the optical properties of metal and semiconductor surfaces. We are currently building a third amplifier to boost the laser power to the multi-terawatt range.

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