Biomedical Engineering Reference
In-Depth Information
FIGURE 2.58
Picture of the module. (Courtesy of Princeton Optronics [PO] and Dr. Chuni Ghosh. With
permission.)
FIGURE 2.59
Diagram of a 3 and 8 W illuminator
(808 nm). The dimensions of the illumina-
tor is 2 × 2 × 2″ and uses 15 W input power
for 3 W output and 40 W for 8 W output.
The beam divergence is 16°. (Courtesy of
Princeton Optronics [PO] and Dr. Chuni
Ghosh. With permission.)
strained-compensated using GaAsP barriers. The active region is followed
by a high-reflecting P-type DBR. A high-aluminum content layer is placed
near the first pair of the P-DBR to later form the oxide aperture. The place-
ment and design of the aperture are critical to minimize optical losses and
current spreading. Band-gap engineering (including modulation doping) is
used to design low-resistivity DBRs with low-absorption losses.
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