Development of High-Power Quasi-CW Laser Bar Stacks With Enhanced Assembly Structure

We report on our recent development of quasi-continuous-wave 940-nm laser diode (LD) bars with passive cooled type. The 10 LD bar stacks with a narrow pitch of 1.54 mm have demonstrated a high output power of 10.1 kW, corresponding to 1 kW/bar, under 200-μs pulses at 50-Hz operating frequency. The m...

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Bibliographic Details
Published in:IEEE photonics technology letters 2016-05, Vol.28 (9), p.983-985
Main Authors: Kageyama, Nobuto, Uchiyama, Takayuki, Nagakura, Takehito, Torii, Kousuke, Takauji, Motoki, Maeda, Junya, Morita, Takenori, Yoshida, Harumasa
Format: Article
Language:English
Subjects:
Bars
Cooling
Diode lasers
high power
Insulators
laser bars
Power generation
power lasers
Residual stresses
Semiconductor lasers
Thermal expansion
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Summary:We report on our recent development of quasi-continuous-wave 940-nm laser diode (LD) bars with passive cooled type. The 10 LD bar stacks with a narrow pitch of 1.54 mm have demonstrated a high output power of 10.1 kW, corresponding to 1 kW/bar, under 200-μs pulses at 50-Hz operating frequency. The maximum conversion efficiency of 58% has been achieved at an output power of 300 W. In condition of 1000 μs pulses at 10-Hz operating frequency, we have achieved an output power of 0.93 kW and a conversion efficiency of 59%, respectively. We consider that the LD bar stacks are suitable for diode pumped high-energy class solid-state lasers.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2016.2522413