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Schematic configuration for laser locking. The laser beam is from a diode laser to photoassociate molecules from cold atoms. The fluorescence yield from the trapped atoms is collected by a convex lens and then detected by an APD. The laser absolute and relative frequency are measured with wavelength meter and confocal Fabry-Pérot cavity, respectively. The inset shows the sketch of the relevant energy levels for photoassociation of cold cesium atoms.
(Color) (a) shows time evolution of the fluorescence with turning photoassociation (PA) laser on and off. (b) shows an ultrahigh resolution trap loss fluorescence spectrum of the vibrational state of the long-range state. PA laser intensity is and scan rate is . The dashed curves are the results of multipeak Gaussian fit. (c) is the corresponding derivative line shape. Laser modulation frequency is and wavelength modulation index is about 2. (d) are the noise power spectra of cold atoms fluorescence and electronic noise of detection system. The inset shows the fraction at ultralow frequency. (e) and (f) show dependences of on modulation index and modulation frequency, respectively. The red curve is a fit of the raw data.
Experimental results of the frequency stabilization using the rotational transition. (a) shows the typical error signal with the feedback loop to the laser on or off. (b) shows the frequency stability described by the square root of the Allan variance .
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