An agile laser with ultra-low frequency noise and high sweep linearity.
We report on a fiber-stabilized agile laser with ultra-low frequency noise. The frequency noise power spectral density is comparable to that of an ultra-stable cavity stabilized laser at Fourier frequencies higher than 30 Hz. When it is chirped at a constant rate of approximately 40 MHz/s, the max non-linearity frequency error is about 50 Hz peak-to-peak over more than 600 MHz tuning range. The Rayleigh backscattering is found to be a significant frequency noise source dependent on fiber length, chirping rate and the power imbalance of the interferometer arms. We analyze this effect both theoretically and experimentally and put forward techniques to reduce this noise contribution.
Jiang
Haifeng
H
Laboratoire National de Métrologie et d'Essais-Système de Références Temps-Espace, Observatoire de Paris, UPMC and CNRS, 61 Avenue de l'Observatoire, 75014 Paris, France. jiang.haifeng@obspm.fr
Kéfélian
Fabien
F
Lemonde
Pierre
P
Clairon
André
A
Santarelli
Giorgio
G
D003198:Computer Simulation; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D007834:Lasers; D016014:Linear Models