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Kolb, Jan Philip; Klein, Thomas; Eibl, Mattias; Pfeiffer, Tom; Wieser, Wolfgang; Huber, Robert (2016): Megahertz FDML Laser with up to 143nm Sweep Range for Ultrahigh Resolution OCT at 1050nm. Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XX, 15-17 February 2016, San Francisco, California, United States.
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We present a new design of a Fourier Domain Mode Locked laser (FDML laser), which provides a new record in sweep range at similar to 1 mu m center wavelength: At the fundamental sweep rate of 2x417 kHz we reach 143nm bandwidth and 120nm with 4x buffering at 1.67MHz sweep rate. The latter configuration of our system is characterized: The FWHM of the point spread function (PSF) of a mirror is 5.6 mu m (in tissue). Human in vivo retinal imaging is performed with the MHz laser showing more details in vascular structures. Here we could measure an axial resolution of 6.0 mu m by determining the FWHM of specular reflex in the image. Additionally, challenges related to such a high sweep bandwidth such as water absorption are investigated.