Analysis of FDML lasers with meter range coherence
Tom Pfeiffer, Wolfgang Draxinger, Wolfgang Wieser, Thomas Klein,, Markus Petermann, Robert Huber
TL;DR
This paper presents a dispersion-compensated FDML laser operating at 3.2 MHz with meter-range coherence, enabling long-range volumetric OCT of moving objects, advancing high-speed optical coherence tomography technology.
Contribution
Development of a dispersion-compensated FDML laser with meter-range coherence at 3.2 MHz sweep rate for long-range OCT applications.
Findings
Achieved meter-range coherence in FDML laser
Enabled volumetric long-range OCT of moving objects
Demonstrated high-speed OCT with improved coherence
Abstract
FDML lasers provide sweep rates in the MHz range at wide optical bandwidths, making them ideal sources for high speed OCT. Recently, at lower speed, ultralong-range swept-source OCT has been demonstrated1, 2 using a tunable vertical cavity surface emitting laser (VCSEL) and also using a Vernier-tunable laser. These sources provide relatively high sweep rates and meter range coherence lengths. In order to achieve similar coherence, we developed an extremely well dispersion compensated Fourier Domain Mode Locked (FDML) laser, running at 3.2 MHz sweep rate and 120 nm spectral bandwidth. We demonstrate that this laser offers meter range coherence and enables volumetric long range OCT of moving objects.
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