Jpn. J. Appl. Phys. 43 (2004) pp. 5269-5272  |Previous Article| |Next Article|  |Table of Contents|
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Single-Wavelength 5.6 kW Direct Diode Laser with a High-Efficiency Beam Combination

Hirofumi Miyajima, Hirofumi Kan, Xin Gao, Takayuki Uchiyama, Teruo Hiruma, Masanobu Yamanaka¹ and Yasukazu Izawa¹

(Received March 8, 2004; accepted April 30, 2004; published August 10, 2004)

Our group developed a new optical system equipped with a slit mirror to combine the output power from two LD stack modules (30 bars each) and focus them into a single beam. The new device realized a CW output power of more than 3 kW with a transfer efficiency of 92%. Furthermore, by combining beams from two added stack modules to the main optical path using polarization coupling, we have achieved a CW output power of 5.6 kW with a single wavelength of 808 nm. The focused spot size was 2.4 mm×0.5 mm (the power intensity was 467 kW/cm²) at a practical focal length of 100 mm. The transfer efficiency from the LD output to the focal spot was estimated to be 86.5%. The total energy efficiency against the input electricity was approximately 45%. This value is the highest ever reported in a high-power LD applied to material processing, and a full threefold higher than that of the diode-pumped Nd:YAG laser, a device heretofore known to be highly efficient (at around 15%).

URL: http://jjap.jsap.jp/link?JJAP/43/5269/
DOI: 10.1143/JJAP.43.5269

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