10-W cw, 5000-hour-lifetime monolithic AlGaAs laser-diode arrays

1990 ◽  
Author(s):  
Masamichi Sakamoto ◽  
David F. Welch ◽  
John G. Endriz ◽  
Erik P. Zucker ◽  
Donald R. Scifres
Keyword(s):  
Laser Diode ◽  
Laser Diode Arrays

High Power Laser Diode Arrays for Pumping Solid State Laser and Pumping Characteristics

1996 ◽  
Vol 24 (Supplement) ◽  
pp. 85-88
Author(s):  
H. Kan ◽  
T. Kanzaki ◽  
H. Miyajima ◽  
Y. Ito ◽  
K. Matsui ◽  
...  
Keyword(s):  
Solid State ◽  
Laser Diode ◽  
High Power ◽  
Solid State Laser ◽  
High Power Laser ◽  
Power Laser ◽  
State Laser ◽  
Laser Diode Arrays ◽  
High Power Laser Diode

Uniform high power nine and 18 element individually addressable laser diode arrays

1991 ◽  
Vol 27 (5) ◽  
pp. 464 ◽  
Author(s):  
D.W. Nam ◽  
R.R. Craig ◽  
D.G. Mehuys ◽  
D.F. Welch
Keyword(s):  
Laser Diode ◽  
High Power ◽  
Laser Diode Arrays

The reliability of the laser diode arrays

2006 ◽  
Author(s):  
Aleksey Vasilyev ◽  
Elisavet Troupaki ◽  
Graham R. Allan ◽  
Nasir B. Kashem ◽  
Mark A. Stephen
Keyword(s):  
Laser Diode ◽  
Laser Diode Arrays

Microchannel-cooled heatsinks for high-average-power laser diode arrays

1993 ◽  
Author(s):  
William J. Benett ◽  
Barry L. Freitas ◽  
Dino R. Ciarlo ◽  
Raymond J. Beach ◽  
Steven B. Sutton ◽  
...  
Keyword(s):  
Laser Diode ◽  
Average Power ◽  
High Average Power ◽  
Power Laser ◽  
Laser Diode Arrays

High Heat Flux Boiling Heat Transfer for Laser Diode Arrays

2016 ◽  
Author(s):  
Todd M. Bandhauer ◽  
Taylor A. Bevis
Keyword(s):  
Heat Transfer ◽  
Thermal Management ◽  
Laser Diode ◽  
Boiling Heat Transfer ◽  
Single Phase ◽  
Laser Diodes ◽  
Heat Fluxes ◽  
Transfer Coefficients ◽  
Heat Transfer Coefficients ◽  
Laser Diode Arrays

The principle limit for achieving higher brightness of laser diode arrays is thermal management. State of the art laser diodes generate heat at fluxes in excess of 1 kW cm−2 on a plane parallel to the light emitting edge. As the laser diode bars are packed closer together, it becomes increasingly difficult to remove large amounts of heat in the diminishing space between neighboring diode bars. Thermal management of these diode arrays using conduction and natural convection is practically impossible, and, therefore, some form of forced convective cooling must be utilized. Cooling large arrays of laser diodes using single-phase convection heat transfer has been investigated for more than two decades by multiple investigators. Unfortunately, either large fluid temperature increases or very high flow velocities must be utilized to reject heat to a single phase fluid, and the practical threshold for single phase convective cooling of laser diodes appears to have been reached. In contrast, liquid-vapor phase change heat transport can occur with a negligible increase in temperature and, due to a high enthalpy of vaporization, at comparatively low mass flow rates. However, there have been no prior investigations at the conditions required for high brightness edge emitting laser diode arrays: >1 kW cm−2 and >10 kW cm−3. In the current investigation, flow boiling heat transfer at heat fluxes up to 1.1 kW cm−2 was studied in a microchannel heat sink with plurality of very small channels (45 × 200 microns) using R134a as the phase change fluid. The high aspect ratio channels (4.4:1) were manufactured using MEMS fabrication techniques, which yielded a large heat transfer surface area to volume ratio in the vicinity of the laser diode. To characterize the heat transfer performance, a test facility was constructed that enabled testing over a range of fluid saturation temperatures (15°C to 25°C). Due to the very small geometric features, significant heat spreading was observed, necessitating numerical methods to determine the average heat transfer coefficient from test data. This technique is crucial to accurately calculate the heat transfer coefficients for the current investigation, and it is shown that the analytical approach used by many previous investigations requires assumptions that are inadequate for the very small dimensions and heat fluxes observed in the present study. During the tests, the calculated outlet vapor quality exceeded 0.6 and the base heat flux reached a maximum of 1.1 kW cm−2. The resulting experimental heat transfer coefficients are found to be as large a 58.1 kW m−2 K−1 with an average uncertainty of ±11.1%, which includes uncertainty from all measured and calculated values, required assumptions, and geometric discretization error from meshing.

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