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Q-switched operation of a Nd:YCOB laser is demonstrated. A Nd:YCOB crystal was end-pumped by laser diodes operating at a wavelength of 0.8μm and with a peak power of 22W, and Q-switching was achieved by the spinning disc technique. Pulses that were as short as 50ns and with up to 0.5mJ of energy were obtained. After optimization, a threshold of 0.5mJ and a slope efficiency of 13% were achieved.
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