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"Dispersion, coherence and noise of Fourier domain mode locked lasers" Benjamin R. Biedermann, Wolfgang Wieser, Christoph M. Eigenwillig, Thomas Klein, Robert HuberOptics Express 17, 9947 (2009) Abstract: 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 to a 10x narrowing compared to the intra-cavity optical bandpass filter. A relative intensity noise of -133dBc/Hz or 0.2% at 100MHz detection bandwidth during sweep operation is observed. For optimum peration, the filter drive frequency has to be set within 2ppm or 120mHz at 51kHz. BMO authors (in alphabetic order): Benjamin Biedermann Christoph Eigenwillig Robert Huber Thomas Klein Wolfgang Wieser Assoziierte Projekte: Optical Coherent Ranging and Optical Coherence Tomography (OCT): Imaging and profilometry with rapidly frequency swept laser sources Fourier Domain Mode Locking (FDML): Spectral mode locking in optics and applications  WWW-Version |
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Letzte Änderung: 2016-09-14 13:34
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