Abstract
We present a method of noise suppression of laser diodes by an unbalanced Michelson fiber interferometer. The unstabilized laser source is represented by compact planar waveguide external cavity laser module, ORIONTM (Redfern Integrated Optics, Inc.), working at 1540.57 nm with a 1.5-kHz linewidth. We built up the unbalanced Michelson interferometer with a 2.09 km-long arm based on the standard telecommunication single-mode fiber (SMF-28) spool to suppress the frequency noise by the servo-loop control by 20 dB to 40 dB within the Fourier frequency range, remaining the tuning range of the laser frequency.
Highlights
Generation of the length of etalons and measurement of the lengths of passive Fabry-Perot cavities [1,2] or their displacement [3,4] is limited by the vibration of mirrors, thermal fluctuations, speed of lock-loops and by noise
We present a frequency noise suppression of the ORIONTM laser module [14] using an unbalanced Michelson fiber interferometer and servo-loop control
The frequency noise data of the laser were recorded and collected from the Fourier frequency signal (or single sideband frequency noise (SSB)) on the RF signal analyzer (RFSA), and they were analyzed on a computer
Summary
Generation of the length of etalons and measurement of the lengths of passive Fabry-Perot cavities [1,2] or their displacement [3,4] is limited by the vibration of mirrors, thermal fluctuations, speed of lock-loops and by noise. Sensors 2015, 15 cavity, but the tunable range of the stabilized laser source is limited to the tuning range of the length of the ultrastable cavity. The linewidth of the typical cavity mode reaches below kHz and MHz, which correspond to pm to nm uncertainty in the cavity length. The measurement of the displacement of the Fabry-Perot cavities could be made by a tunable laser with sub-kHz to sub-MHz linewidth with an optical reference laser with better or the same linewidth [6,7]
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