Abstract
A high-power small-sized optical head which adopts a laser diode (LD) pumped Nd: yttrium aluminum garnet (YAG) laser (maximum power: 16 W) for a laser-induced thermal-transfer printing system was developed. The size of the developed optical head is 10 cm (width) × 15 cm (depth) × 3 cm (height); the maximum power of an optical spot that can be obtained is 1.2 W. Stable characteristics of pulse width modulation and rise-time using the acousto/optic modulator (AOM) are confirmed experimentally. Digital high-definition image printing was evaluated at the 3 µs laser pulse by the developed head. The system achieved a more than 10-fold speed increase over our previous system which adopted a 100 mW laser diode. In addition, a good high-definition digital image was confirmed. In this paper, we describe the optical design and optical characteristics of the high-power small-sized optical head, which adopts a laser diode pumped Nd:YAG laser; we also present experimental results of the digital high-definition image.
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