We have achieved a high-quality beam generation wih highly efficient quasi-cw Nd:YAG laser over 1-kW with a novel side-pumping configuration using micro-lens free diode-stacks as a part of "Advanced Photon Processing and Measurement Technologies" program. We have demonstrated a power scaling of Nd:YAG rod laser over 1 kW while maintaining high-beam-quality and high-efficiency by cascaded-coupling of two identical bifocusing compensation resonators. Laser power of 1050W was obtained with the beam quality of M2 = 8 at the electric-to-optical efficiency of 23%. In this work, we also demonstrated the focusing ability of less than 50 μm diameter on the focal plane by using a f50mm lens (N.A. 0.2). Moreover, with driving AO-Q switch in burst mode operation, over 2MW pulse peek is demonstrated.
We have achieved a high-quality beam generation with highly efficient quasi-cw Nd:YAG laser over 1-kW with a novel side-pumping configuration using micro-lens free diode-stacks as a part of "Advanced Photon Processing and Measurement Technologies" program. We have demonstrated a power scaling of Nd:YAG rod laser over 1-kW while maintaining high-beam-quality and high-efficiency by cascaded-coupling of two identical bifocusing compensation resonators. Laser power of 1050W was obtained with the beam quality of M2 = 8 at the electric-to-optical efficiency of 23%. In this work, we also demonstrated the focusing ability of less than 50 μm diameter on the focal plane by using a f50 mm lens (N.A. 0.2).
KEYWORDS: Nd:YAG lasers, Diode pumped solid state lasers, Copper, Laser drilling, High power lasers, Solid state lasers, Laser processing, Rod lasers, Resonators, Neodymium
We have proposed a highly efficient and high-brightness quasi-cw Nd:YAG rod laser with a novel-side-pumping design using micro-lens free diode-stacks. We achieved 320W output power with 28-% electrical-to-optical efficiency, which is, to our knowledge, the highest efficiency reported for diode- pumped solid-state lasers. We generated the high quality beam of M2equals4 with the output power of 500W while maintaining the electrical-to-optical efficiency of 20%. We also demonstrated through-hole formation of 1mm thick copper plate using the high brightness laser beam and successfully obtained round holes with the diameter of less than 40 micrometers .
We obtained the 266nm UV power of 23W by fourth-harmonic generation using a high-brightness high-power all-solid- state green laser and a high-quality CLBO crystal. This value is, to our knowledge, the highest UV power below 300nm wavelength. Moreover, the UV-power variation was negligibly small by using high-crystal CLBO crystals.
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