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Proceedings Paper

High-power operation of 1cm laser diode bars on funryu heat sink cooled by fluorinated-refrigerant
Author(s): Satoru Oishi; Hirofumi Miyajima; Noriyasu Suzuki; Tomoyuki Natsume; Toru Fujita; Koji Nishida; Hironobu Kurino; Ryusuke Okamoto; Nobuto Kageyama; Nobutaka Suzuki; Takayuki Uchiyama; Hirofumi Kan
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Paper Abstract

We investigated the properties of fluorinated refrigerants for high-power laser diode bars mounted on a funryu heat sink. The thermal conductivity of fluorinated refrigerants is about ten times lower than that of water, but they are less corrosive to funryu heat sinks. Using 3M's "Fluorinet" FC77 and "Novec" HFE-7300 and comparing them with water as refrigerants, we developed a new fluorinated refrigerant cooling device that is suitable for removing heat from highpower LDs and LD modules. This device achieved CW light-output power from a 1-cm LD bar equivalent to that for a cooling device using ion-exchange water. With HFE-7300 as the refrigerant, we achieved over 100 W of output power at a drive current of CW 120 A and over 1.5 kW for a stacked-LD module operated at a constant current of 55 A in continuous-wave (CW) mode. High-power LD bars subjected to lifetime testing under these conditions have been successfully running for over 15,000 consecutive hours.

Paper Details

Date Published: 23 February 2009
PDF: 8 pages
Proc. SPIE 7198, High-Power Diode Laser Technology and Applications VII, 71980E (23 February 2009); doi: 10.1117/12.808703
Show Author Affiliations
Satoru Oishi, Hamamatsu Photonics K.K. (Japan)
Hirofumi Miyajima, Hamamatsu Photonics K.K. (Japan)
Noriyasu Suzuki, Hamamatsu Photonics K.K. (Japan)
Tomoyuki Natsume, Hamamatsu Photonics K.K. (Japan)
Toru Fujita, Hamamatsu Photonics K.K. (Japan)
Koji Nishida, Hamamatsu Photonics K.K. (Japan)
Hironobu Kurino, Hamamatsu Photonics K.K. (Japan)
Ryusuke Okamoto, Hamamatsu Photonics K.K. (Japan)
Nobuto Kageyama, Hamamatsu Photonics K.K. (Japan)
Nobutaka Suzuki, Hamamatsu Photonics K.K. (Japan)
Takayuki Uchiyama, Hamamatsu Photonics K.K. (Japan)
Hirofumi Kan, Hamamatsu Photonics K.K. (Japan)

Published in SPIE Proceedings Vol. 7198:
High-Power Diode Laser Technology and Applications VII
Mark S. Zediker, Editor(s)

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