Dispersion, coherence and noise of Fourier domain mode locked lasers - opticsinfobase.org -Optical Coherence Tomography News

Dispersion, coherence and noise of Fourier domain mode locked lasers

opticsinfobase.org May 29 2009 Tunable Sources

We report on the effect of chromatic dispersion on coherence length and noise of Fourier Domain Mode Locked (FDML) lasers. An FDML laser with a sweep range of 100nm around 1550nm has been investigated. Cavity configurations with and without dispersion compensation have been analyzed using different widths of the intra-cavity optical band-pass filter. The measurements are compared to non-FDML wavelength swept laser sources. Based on these observations, a simple model is developed providing a connection between timing, photon cavity lifetime and characteristic time constant of the filter. In an optimized configuration, an instantaneous laser linewidth of 20pm is observed, corresponding ...
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