Efficient, high photostability, high brightness, co-polymer solid state dye lasers

Shirin M. Giffin Department of Physics, University of Otago, PO Box 56, Dunedin, New Zealand E-mail: [email protected]

William J. Wadsworth Department of Physics, University of Otago, PO Box 56, Dunedin, New Zealand E-mail: [email protected]

Iain T. McKinnie Department of Physics, University of Otago, PO Box 56, Dunedin, New Zealand E-mail: [email protected]

Anthony D. Woolhouse Industrial Research Limited, Gracefield Research Centre, Lower Hutt, New Zealand

Gerald J. Smith Industrial Research Limited, Gracefield Research Centre, Lower Hutt, New Zealand

Tim G. Haskell Industrial Research Limited, Gracefield Research Centre, Lower Hutt, New Zealand

Abstract

We report an investigation of the laser beam quality, efficiency and photostability of rhodamine 590 solid state dye lasers with hosts based upon 2-hydroxyethylmethacrylate and methylmethacrylate P(HEMA:MMA) co-polymers and modified methylmethacrylate (MPMMA) polymers with ethanol and dimethylsulphoxide additives. Highest efficiencies were obtained with MPMMA, with slope efficiencies of up to 44% (corresponding to 61% optical-optical conversion) measured for ethanolic MPMMA. P(HEMA:MMA) hosts gave superior photostability, with the highest normalized photostability of 240 GJ mol⁻¹ obtained for a P(HEMA:MMA) 1:1 rod. A simple resonator has been used to compensate the effects of thermal lensing and pump mode-mismatch, resulting in optimized beam quality for MPMMA lasers.

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Efficient, high photostability, high brightness, co-polymer solid state dye lasers

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