Double APD Detection System

In the Nanonics Double APD Detection system, the optical signal generated by the Nanonics NSOM head and captured by any microscope objective is split in half and sent to the two APDs. Such a configuration is used when one needs to obtain simultaneous information about different optical properties of a sample. 
For example, one can orient the two APDs at right angles with respect to each other and attach the appropriate filters to obtain simultaneous dual polarization NSOM measurements. Alternatively, one can simultaneously obtain a reflection image at the wavelength of the excitation laser and a fluorescent image at the wavelength that was excited by the laser.



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