THORLABS INT-POL-1300, Руководство по эксплуатации

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3 Detailed Description
INT-POL-1300 / page 6
3 Detailed Description
3.1 General Principle of Operation
The Thorlabs INT-POL-1300 is a subassembly to be used in polarization sensitive
swept source Fourier domain OCT systems and other applications. It contains two
polarization beam splitters and two balanced detectors.
The S and P polarization states of the optical input signals are split using polarization
beamsplitters (PBS). The split inputs are directed into two balanced detectors, one
for each SOP. These balanced photodetectors subtract the two optical input signals
from each other resulting in the cancellation of common mode noise. This allows
small changes on the signal path to be extracted from the interfering noise floor for
each SOP independently.
The INT-POL-1300 enables to extract additional information about the birefringence
of the sample by calculating the phase retardation between the two balanced outputs.
The INT-POL-1300 is powered by the included external power supply (

12 V,
250 mA) via a PICO M8 power connector.
Figure 2 shows a functional block diagram of the INT-POL-1300.
Figure 2: Functional block diagram of the INT-POL-1300