Superposition of two independent FDML lasers

Christin Grill, Simon Lotz, Torben Blomker, Mark Schmidt, Wolfgang Draxinger, Jan Philip Kolb, Christian Jirauschek, Robert Huber


Fourier domain mode locking (FDML) is a laser operating regime, which was developed in 2005 [1]. The output of this laser is a train of optical wavelength sweeps, equivalent to extremely chirped pulses with an optical bandwidth of up to 25 THz and frequency tuning rates of >10 19 Hz/s. This laser type was developed for optical coherence tomography [2] , but found recently more and more applications like LiDAR [3] , Raman microscopy [4] or two-photon microscopy [5]. The laser's coherence properties are relevant for a better understanding of the FDML laser itself and its applications. Because of the wide sweep range and high tuning rate, the laser linewidth cannot be measured with an RF spectrometer. Superposition with a narrowband continuous wave laser only yields phase information for small fractions of the sweep [6]. However, beat signal measurements between two independent FDML lasers with equal sweep range and direction can give information about the complete sweep.

Original languageEnglish
Title of host publication2021 Conference on Lasers and Electro-Optics & European Quantum Electronics Conference
Publication date06.2021
Publication statusPublished - 06.2021


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