Real-time depth-resolved holographic imaging using photorefractive MQW devices

Summary form only given. Using an "image plane" holographic set up, holograms were written in photorefractive MQW devices using a mode-locked Ti:sapphire laser, which produced 100-fs pulses at 830-nm wavelength. The input pulse train was split into approximately equal average power object and reference beams. The object beam was reflected off the US Air Force test chart, which was imaged 1:1 onto the MQW device, where it interfered with the reference beam. The reference and object beam path lengths were interferometrically matched to within the coherence length of the femtosecond pulses (/spl sim/80 /spl mu/m), such that a hologram could be written. Thus the depth resolution was determined by the coherence length of the femtosecond laser pulse. The holographic imaging was "real-time" with a response time much faster than the frame rate of the CCD camera.