Heavy-water-based solutions of rhodamine dyes: photophysical properties and laser operation |
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Authors: | S Sinha AK Ray S Kundu S Sasikumar K Dasgupta |
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Institution: | (1) Laser and Plasma Tech. Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India, IN |
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Abstract: | Photophysical properties of heavy-water-based rhodamine dye solutions have been investigated, with a view to assess the suitability
of heavy water as a solvent for high-power, high-repetition-rate dye lasers and amplifiers. We have measured the quantum yield
of fluorescence of the commonly used dyes rhodamine-6G, rhodamine-B and kiton-red, dissolved in heavy water, ethanol and normal
water. The performance of a heavy-water-based pulsed rhodamine-6G dye laser has been investigated in broadband, as well as
in narrowband wavelength-tunable resonator configurations, yielding laser efficiencies comparable to those achieved with ethanolic
solutions of the same dye. We have also studied the thermo-optic properties of normal and heavy water, using the Z-scan technique.
Finally, photodegradation rates for laser dyes have been compared in heavy water, normal water and ethanol. Our results establish
heavy water as a solvent superior to both ethanol and normal water, on account of the lower thermo-optic effects and the higher
photostability of rhodamine dyes when dissolved in heavy water.
Received: 8 February 2002 / Published online: 8 August 2002 |
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Keywords: | PACS: 42 55 Mv 42 65 Jx 61 80 Ba |
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