Biomedical Engineering Reference
In-Depth Information
250
200
150
100
50
0
0
50
100
150
200
250
300
Current (A)
FIGURE 2.46
Picture of high-power 5 mm × 5 mm 2-D VCSEL array mounted on a micro-cooler and measure
CW output power and voltage at a constant heat-sink temperature. Roll-over power is >230 W.
(Courtesy of Princeton Optronics [PO] and Dr. Chuni Ghosh. With permission.)
1000
100
800
80
Output power OUT (W)
600
60
50.4%
PCE (%)
420 W
400
40
200
20
976 cm VCSEL array chip
0.22 cm 2 emission area
0
0
0
500
1000
1500
2000
Electrical power IN (W)
FIGURE 2.47
Power versus current for a small VCSEL 2-D array under different QCW regimes. These arrays
exhibit power densities of >4.2 kW/cm 2 . (Courtesy of Princeton Optronics [PO] and Dr. Chuni
Ghosh. With permission.)
arrays with water pump and a radiator cooling like that of a car engine.
Figure 2.48 shows such a setup in which a radiator and water pump is used
to cool a 120 W array of VCSELs. The result of the cooling arrangement is
compared with a chiller cooling and shown in Figure 2.43.
Figure 2.49a shows the performance of a 120 W VCSEL array with fan-
radiator cooling with water temperature at 45°C versus cooling with a
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