Nanosecond Photodetectors
General Features and Principles • 13
oscilloscopes, for instance, have only 10-MHz to 100-
MHz bandwidth. When you select the 10-k
Ω
resistor,
the speed is RC limited, and the response speed will
typically be
≥
50 ns.
Figure 5:
Typical pulse
response for
the (a) Model
1621 and (b)
Model 1623
photodetectors
0
2
4
6
8
10
Time (ns)
(a) Model 1621
0
2
4
6
8
10
Time (ns)
(b) Model 1623
A 0.15-ps pulse at 1.06 µm was used to test the
photodetectors, and the output was measured
using a 12-GHz oscilloscope.
162x nanosec revB.fm Page 13 Friday, August 17, 2001 5:51 PM
