Krishna K Jagtap
Articles written in Pramana – Journal of Physics
Volume 75 Issue 5 November 2010 pp 991-998 Conributed Papers
Kiton red S dye: Photophysical, photostability, photothermal and narrow-band laser performances using different solvents
Krishna K Jagtap Alok K Ray S K Pardeshi K Dasgupta
Many aspects of photophysical, photostability and laser properties of kiton red S dye remain unresolved, particularly for pumping with 578 nm radiation of CVL and 532 nm output of Nd:YAG lasers, and these are studied using different alcohol- and water-based binary solvents. Our results show that methanol is better suited for low and high-repetition-rate KRS dye lasers because of its superior laser efficiency, photostability as well as photothermal properties.
Volume 82 Issue 2 February 2014 pp 277-281 Contributed Papers
Taming fluorescence yield of dye insensitive to temperature by non-covalent complex with the host CB for aqueous dye lasers
Monika Gupta Krishna K Jagtap V Sudarsan Alok K Ray
Quantum yield of fluorescence (QYF) of widely used Rhodamine (RhB) dye in ethanol and water was observed to decrease rapidly with increase in temperature of the dye solutions, which was correlated to enhanced torsional motion of its flexible diethylamino groups. This is harmful for its use in high-average power dye lasers, pumped by copper vapour laser (CVL) or diodepumped solid-state green laser (DPSSGL), in which bulk temperature of the dye solution was found to increase due to the heat generated by circulation pumps and non-radiative decay processes of excited dye molecules. The QYF of RhB dye in water was found to be not sensitive to temperature in the practical operating region 16–25°C of dye laser by adopting supramolecular route to form an inclusion complex of RhB with the container molecule cucurbituril (CB).
Volume 97, 2023
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