Principle layout of a photodiode circuit. Unit C1 serves as a current-to-voltage converter. A1 is a voltage amplifier.
(Color online) The main noise sources as functions of the conversion factor , converting photocurrent to voltage.
The GEO600 dark-port photodetector design used until the end of 2005. The european symbol for coils is used as shown in the legend.
LIGO photodetector design.
VIRGO photodetector design.
GEO600 new photodetector design. The resonant circuits L1/C1 and L2/C2 and the signal extraction around them are just two examples. If the sequence of L and C is altered, the shape of the response changes at frequencies different from the resonant frequency. A transformer (as L2/L2a) can be used to provide an optimized signal size.
(Color online) Measurement of signal sizes at three radio frequencies, for the old and new GEO600 photodetector designs. The signal sizes are measured as a function of the laser power.
Measurement of transfer functions from a photodiode test input to different points of the new photodetector circuit.
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