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17 July 2015 High power 355 nm diode-pumped solid-state laser
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Proceedings Volume 9524, International Conference on Optical and Photonic Engineering (icOPEN 2015); 95241A (2015)
Event: International Conference on Optical and Photonic Engineering (icOPEN2015), 2015, Singapore, Singapore
This paper reported a high-power diode-pumped solid-state laser for material processing applications with a target of more than 60 ns pulse width at 355 nm. As known, long pulse width IR laser (around 70-100 ns) is difficult to get high conversion efficiency to UV since the peak power is more than 2 times lower than 20-30 ns laser. However, the unique long pulse width characteristic makes the laser an ideal tool for flexible PCB drilling with 30-50 μm holes and for cutting portable devices. Up to 52.2% IR to UV conversion efficiency was obtained by our novel intra-cavity harmonic generation cavity design. A 9.3W UV output at 30 kHz was demonstrated with compact intra-cavity sum frequency design. Special conduction cooling-designed LD side-pumped module provided 17.8 W fundamental IR output power with AOM q-switching. The UV output pulse width is 76 ns at 30 kHz and 140 ns at 70 kHz. The type I and type II phase matching LBOs were used for intra-cavity harmonic generations of 355 nm. The output characteristics of the IR and the harmonic generations varying with the pulse repetition rate were also investigated. The experimental results are in agreement with the theoretical modelling. This system will also be useful for many material processing applications such as PCB cutting and wafer scribing.
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Yang Yu, Chee Yuen Cheng, Xiaoyuan Peng, and Saw Soon Yong "High power 355 nm diode-pumped solid-state laser", Proc. SPIE 9524, International Conference on Optical and Photonic Engineering (icOPEN 2015), 95241A (17 July 2015);


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