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Experimental Validation of a Simple Approximation to Determine the Linewidth of a Laser from its Frequency Noise Spectrum
Résumé Laser frequency fluctuations can be characterized either comprehensively by the frequency noise spectrum or in a simple but incomplete manner by the laser linewidth. A formal relation exists to calculate the linewidth from the frequency noise spectrum, but it is laborious to apply in practice. We recently proposed a much simpler geometrical approximation applicable to any arbitrary frequency noise spectrum. Here we present an experimental validation of this approximation using laser sources of different spectral characteristics. For each of them, we measured both the frequency noise spectrum to calculate the approximate linewidth and the actual linewidth directly. We observe a very good agreement between the approximate and directly measured linewidths over a broad range of values (from kilohertz to megahertz) and for significantly different laser line shapes.
   
Mots-clés Instrumentation, measurement, and metrology; Lasers; Fluctuations, relaxations, and noise; Linewidth
   
Citation Bucalovic, N., Dolgovskiy, V., Schori, C., Thomann, P., Di Domenico, G., & Schilt, S. (2012). Experimental Validation of a Simple Approximation to Determine the Linewidth of a Laser from its Frequency Noise Spectrum. Applied Optics, 51(20), 4582-4588.
   
Type Article de périodique (Anglais)
Date de publication 2-7-2012
Nom du périodique Applied Optics
Volume 51
Numéro 20
Pages 4582-4588
URL http://www.opticsinfobase.org/ao/abstract.cfm?uri=ao-51-2...
Liée au projet Fundamental metrology with laser-cooled atoms and optical...