Advanced Centre of Research in High Energy Materials (ACRHEM)

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Browsing Advanced Centre of Research in High Energy Materials (ACRHEM) by Author "Bhar, Gopal C."
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    Generation of ultraviolet radiation with wide angular tolerance in cesium lithium borate crystal
    ( 2000-01-01) Bhar, Gopal C. ; Kumbhakar, Pathik ; Chaudhary, Anil K.
    Tangential phase-matching has been realised in cesium lithium borate (CLBO) crystal for the first time for the generation of fourth harmonic (266 nm) of Nd:YAG and third harmonic (226.7 nm) of a dye laser radiation by second harmonic generation and sum-frequency mixing with the angular tolerance as large as 22 mrad and 21 mrad respectively, over one of the interacting beams. An energy conversion efficiency of 15% for fourth harmonic generation is obtained with a 5.5 mm thick crystal and with the average pump powers only 170 and 70 mW. A set of Sellmeier dispersion equations for the CLBO crystal have also been formulated.
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    Highly efficient deep ultraviolet generation by sum-frequency mixing in a BBO crystal pair
    ( 2002-01-01) Bhar, Gopal C. ; Kumbhakar, Pathik ; Chatterjee, Udit ; Chaudhary, Anil K. ; Kokh, Alexander
    Generation of deep ultraviolet radiation at 210 nm by Type-I third harmonic generation is achieved in a pair of BBO crystals with conversion efficiency as high as 36%. The fundamental source is the dye laser radiation pumped by the second harmonic of a Q-switched Nd: YAG laser. A walk-off compensated configuration with the BBO crystal pair has enabled us to realize such a high conversion efficiency in the interaction.