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Laser frequency modulation noise measurement by recirculating delayed self-heterodyne method

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Abstract

I propose and demonstrate the use of the recirculating delayed self-heterodyne (DSH) method for measuring FM noise power spectral densities (PSDs), which are the most fundamental measure characterizing the spectral purity of laser sources. By analyzing the DSH beat signals with 1, 10, and 160km delays, the FM noise PSD of a narrow- linewidth fiber laser is evaluated for Fourier frequency range between 10Hz and 100kHz, which exhibits flicker noise as the dominant contribution.

© 2011 Optical Society of America

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