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2500INT Integrating Sphere
The Model 2500INT Integrating Sphere is the latest addition to
Keithley's growing line of solutions for LIV (light-current-volt-
Enables direct optical power measurement in watts with the Model 2502
age) testing . When connected via a low noise triax cable to the
Model 2502 Dual Photodiode Meter included in Keithley's LIV
Test System, the integrating sphere allows the system to make
direct measurements of optical power, with results expressed
in watts . The integrating sphere simplifies production testing of
laser diodes (LDs), light emitting diodes (LEDs), and other opti-
cal components by eliminating common optical power measure-
ment problems related to detector alignment, beam profile,
polarization, and back reflection .
Choice of Three Detector Types
The Model 2500INT is available with a silicon (2500INT-2-Si),
germanium (2500INT-2-Ge), or cooled indium gallium arsenide
(InGaAs) detector (2500INT-2-IGAC), each calibrated with the
sphere . Spheres equipped with cooled indium gallium arse-
nide detectors include a controller to regulate the detector's
temperature .
unaffected by DuT beam Profile
Laser diodes can produce non-gaussian beam profiles, which
can lead to inaccurate optical power measurements due to
underfill or overfill of the detector . While a number of methods
are available to correct for underfill and overfill, these methods
can add to the overall inaccuracy of the measurement .