Model 2520INT Quick Start Guide
Getting Started
2-3
Figure 2-2
Electrical connections
Connections to DUT
Free space operation and alignment considerations
For free space operation, position the Model 2520INT as close as possible to the DUT.
Proper alignment of the Model 2520INT to the light source under test is important for
optimum optical power measurement. Key considerations include divergent beams, colli-
mated beams, and full beam collection.
Divergent beams
Devices such as diode chips and bars have divergent beams. As shown in
, the
beam diameter increases as distance from the source increases. If improperly placed, the
port could block some of the entrance beam and lead to inaccurate power measurement.
To avoid inaccurate measurements, the large and small divergence angles of a diode laser
source should be aligned as indicated by the markings at the sphere entrance port.
CURRENT
OUTPUT
CAT I
DETECTOR 1
DETECTOR 2
BIAS
CURRENT
INPUT
HI
LO
ISOLATION FROM EARTH: 10V MAX.
VOLTAGE
SENSE
HI
LO
Model 2520
Testhead
Detector
!
!
Model 2520INT
Integrating Sphere
7078-TRX
Triax Cable
Detector
