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The Strathprints institutional repository is a digital archive of University of Strathclyde research outputs.

Strathprints serves world leading Open Access research by the University of Strathclyde, including research by the Strathclyde Institute of Pharmacy and Biomedical Sciences (SIPBS), where research centres such as the Industrial Biotechnology Innovation Centre (IBioIC), the Cancer Research UK Formulation Unit, SeaBioTech and the Centre for Biophotonics are based.

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Efficient, high repetition-rate femtosecond blue source using a compact Cr:LiSAF laser

Agate, B. and Kemp, A. and Brown, C.T.A. and Sibbett, W. (2002) Efficient, high repetition-rate femtosecond blue source using a compact Cr:LiSAF laser. Optics Express, 10 (16). pp. 824-831. ISSN 1094-4087

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Abstract

We present a practical route to designing a portable femtosecond blue light source that is rugged, compact and battery-powered. An opticaloptical second-harmonic generation (SHG) efficiency of 30% is reported using a diode-pumped, femtosecond Cr:LiSAF laser requiring only ~1.2W of electrical drive. 12mW of blue average power is generated using a 3mm KNbO3 crystal in a simple, single-pass extracavity geometry. The corresponding electrical-blue efficiency of 1% is, to our knowledge, the highest reported efficiency of any femtosecond blue source. Despite conditions of large group velocity mismatch, we show that the temporally-broadened blue pulses remain well within the femtosecond regime, at ~540fs.