Comparison of thermal management techniques for semiconductor disk lasers

S. Giet, A. Kemp, D. Burns, S. Calvez, M.D. Dawson, S. Suomalainen, A. Harkonen, M. Guina, O. Okhotnikov, M. Pessa

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Semiconductor Disk Lasers (SDLs) are compact lasers suitable for watt to multi-watt direct generation in the 670- 2350nm waveband and frequency-doubled operation in the ultraviolet and visible regions. This is, however, critically dependent on the thermal management strategy used as, in this type of laser, the pump is absorbed over micrometer lengths and the gain and loss are temperature sensitive. In this paper, we compare the two heat dissipation techniques that have been successfully deployed to-date: the "thin device" approach where the semiconductor active mirror is bonded onto a heatsink and its substrate subsequently removed, and the "heatspreader" technique where a high thermal conductivity platelet is directly bonded onto the active part of the unprocessed epilayer. We show that for SDLs emitting at 1060nm with pump spots of ~80m diameter, the heatspreader approach outperforms the thin-device alternative, with the best results being obtained with a diamond heatspreader. Indeed, the thermal resistances are measured to be 4.9, 10.4 and 13.0 K/W for diamond-bonded, SiC-bonded and flip-chip devices respectively. It is also observed, as expected, that the thermal management strategy indirectly affects the optimum output coupling and thus the overall performance of these lasers.
LanguageEnglish
Pages687115
JournalProceedings of SPIE the International Society for Optical Engineering
Volume6871
DOIs
Publication statusPublished - 2008

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Thermal Management
Videodisks
Temperature control
Semiconductors
Diamond
Semiconductor materials
Laser
Lasers
Diamonds
Flip chip devices
Pumps
lasers
Strombus or kite or diamond
Epilayers
Pump
Platelets
Heat losses
Heat resistance
diamonds
Thermal conductivity

Cite this

Giet, S. ; Kemp, A. ; Burns, D. ; Calvez, S. ; Dawson, M.D. ; Suomalainen, S. ; Harkonen, A. ; Guina, M. ; Okhotnikov, O. ; Pessa, M. / Comparison of thermal management techniques for semiconductor disk lasers. In: Proceedings of SPIE the International Society for Optical Engineering. 2008 ; Vol. 6871. pp. 687115.
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Comparison of thermal management techniques for semiconductor disk lasers. / Giet, S.; Kemp, A.; Burns, D.; Calvez, S.; Dawson, M.D.; Suomalainen, S.; Harkonen, A.; Guina, M.; Okhotnikov, O.; Pessa, M.

In: Proceedings of SPIE the International Society for Optical Engineering, Vol. 6871, 2008, p. 687115.

Research output: Contribution to journalArticle

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T1 - Comparison of thermal management techniques for semiconductor disk lasers

AU - Giet, S.

AU - Kemp, A.

AU - Burns, D.

AU - Calvez, S.

AU - Dawson, M.D.

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AU - Harkonen, A.

AU - Guina, M.

AU - Okhotnikov, O.

AU - Pessa, M.

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N2 - Semiconductor Disk Lasers (SDLs) are compact lasers suitable for watt to multi-watt direct generation in the 670- 2350nm waveband and frequency-doubled operation in the ultraviolet and visible regions. This is, however, critically dependent on the thermal management strategy used as, in this type of laser, the pump is absorbed over micrometer lengths and the gain and loss are temperature sensitive. In this paper, we compare the two heat dissipation techniques that have been successfully deployed to-date: the "thin device" approach where the semiconductor active mirror is bonded onto a heatsink and its substrate subsequently removed, and the "heatspreader" technique where a high thermal conductivity platelet is directly bonded onto the active part of the unprocessed epilayer. We show that for SDLs emitting at 1060nm with pump spots of ~80m diameter, the heatspreader approach outperforms the thin-device alternative, with the best results being obtained with a diamond heatspreader. Indeed, the thermal resistances are measured to be 4.9, 10.4 and 13.0 K/W for diamond-bonded, SiC-bonded and flip-chip devices respectively. It is also observed, as expected, that the thermal management strategy indirectly affects the optimum output coupling and thus the overall performance of these lasers.

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