1. 114 nm broadband all-fiber nonlinear polarization rotation mode locked-laser and time-stretch optical coherence tomography

    114 nm broadband all-fiber nonlinear polarization rotation mode locked-laser and time-stretch optical coherence tomography

    We propose and demonstrate an all-fiber Er-doped mode-locked laser with a 3-dB spectrum of 114 nm by using nonlinear polarization rotation (NPR), which to the best of our knowledge is the first realization to date of such a broad spectrum without any spatial optical devices. The repetition rate and pulse width of the laser are 183.6 MHz and 3.7 ps, respectively. Such an all-fiber NPR mode-locked laser is then applied in time-stretch optical coherence tomography. The axial resolution is 12.1 µm. The all-fiber high speed broadband swept laser based on the time stretching technique has compact structure ...

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