• J K Mittal

      Articles written in Pramana – Journal of Physics

    • Development of a 16 kHz repetition rate, 110 W average power copper HyBrID laser

      R Biswal P K Agrawal G K Mishra S V Nakhe S K Dixit J K Mittal

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      This paper presents the design and performance analysis of an indigenously developed 110 W average output power copper HyBrID laser operating at 16 kHz pulse repetition rate. The laser active medium was confined within a fused silica tube of $\sim 6$ cm diameter and $\sim 200$ cm active length. An in-house developed high-power ($\sim 10$ kW) solid-state pulser was used as the electrical excitation source. A simple estimation of deposited electrical power, at the laser head, was carried out and based on it, the laser tube efficiency was found to be 2.9% at 70 W and 2.2% at 110 W laser power levels.

    • Development of insulated gate bipolar transistor-based power supply for elemental copper vapour laser

      R K Mishra S V Nakhe G N Tiwari J K Mittal

      More Details Abstract Fulltext PDF

      The elemental copper vapour laser is a widely used laser from a family of metal vapour lasers for applications such as dye laser pumping, micromachining etc. In this paper, we report the development and performance of IGBT-based pulsed power supply that replaced conventional thyratron-based power supply for 4.7 cm diameter, 150 cm long copper vapour laser. The laser tube delivered an average power of 51 W, which with conventional power supply was giving 40 W. The IGBT-based power supply offers considerable reduction in the running cost of the laser. It is more user-friendly when compared with the conventional power supply.

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