Correlated self-heterodyne method for ultra-low-noise laser linewidth measurements
Zhiquan Yuan, Heming Wang, Peng Liu, Bohan Li, Boqiang Shen, Maodong Gao, Lin Chang, Warren Jin, Avi Feshali, Mario Paniccia, John E. Bowers, Kerry J. Vahala
Abstract
Narrow-linewidth lasers are important to many applications spanning precision metrology to sensing systems. Characterization of these lasers requires precise measurements of their frequency noise spectra. Here we demonstrate a correlated self-heterodyne (COSH) method capable of measuring frequency noise as low as 0.01 Hz 2 /Hz at 1 MHz offset frequency. The measurement setup is characterized by both commercial and lab-built lasers, and features low optical power requirements, fast acquisition time and high intensity noise rejection.
Topics & Concepts
Laser linewidthOpticsMetrologyHeterodyne (poetry)LaserPhase noiseNoise (video)Heterodyne detectionRelative intensity noiseMaterials sciencePhysicsSemiconductor laser theoryOptoelectronicsComputer scienceAcousticsImage (mathematics)Artificial intelligenceAdvanced Fiber Laser TechnologiesPhotonic and Optical DevicesMechanical and Optical Resonators