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This invention dynamically balances the light incident on differential detectors in MO recording. This improves the SNR of the system.
English (United States)
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Electronically Controlled Halfwave Plate for MO Recording
This invention dynamically balances the light incident on differential detectors
in MO recording. This improves the SNR of the system.
In order for differential detection to be optimally effective in optical recording,
the light incident must be balanced between the two detectors. In current
systems, this is done manually with a halfwave plate. Changing lasers or discs
requires either sub-optimal performance or readjustment of halfwave plate.
The proposed electronic controlled light balance consists of a transmission
LCD and a feedback network to control the polarization of the light. The
polarization vector of light can be altered in transmission through the LCD by
changing the bias voltage.
In an optical system with differential detection, the difference signal is
bandlimited and used to control the bias voltage through an electronic feedback
The low pass filter that bandlimits the signal should have a very low (5 - 10
hz) cutoff frequency to minimize any possibility of effecting data detection.
The LCD acts as a halfwave plate, rotating the polarization vector at the
polarizing beam splitter to maintain DC balance and a high common mode
rejection ration. Any induced birefringence can be compensated for with a
quarterwave plate, and any possible signal decrease is made up for by lowering