Abstract

Ultraviolet or visible frequency converted diode-pumped solid-state laser is one of the most promising candidates for drilling or trimming of printed circuit boards. To achieve higher throughput, it is essential to enhance average output power at high repetition frequency. Although, more than 20 W 351-nm average output power has been reported with an intracavity-frequency-tripled Nd:YLF laser, it’s pulse repetition frequency was 2.5 kHz,¹ and average output power of high repetition 355-nm beam sources were limited at a level of 5 W.^2,3

© 2001 Optical Society of America