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PT-OCT instrumentation. The light from a superluminescent diode (SLD) is split between a reference and sample arm using a 50:50 fiber coupler (50:50). The photothermal excitation is provided by a Titanium:Sapphire laser (Ti:Sapphire) that is amplitude modulated by an acousto-optic modulator (AOM). HWP: Half-wave plate. PC: Polarization compensation.
