Abstract
This paper describes a distributed-feedback laser diode system frequency stabilized by simple saturated absorption technique at 895 nm on the Cs D <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1</sub> line with a linewidth narrower than 1 MHz. This laser source was developed to be used in a compact cesium atomic clock based on coherent population trapping. The frequency stability of the laser system, evaluated by measuring the beat note of two similar laser systems and characterized by Allan deviation, is measured to be lower than 1 × 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-11</sup> for integration times of up to 2000 s, even achieving 4 × 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">12</sup> at 200 s. This laser diode system, mounted in a mechanically stable cage system using easy-to-find commercially available components, remains in locked operation for several weeks without any problem.
Highlights
F REQUENCY-STABILIZED laser diode systems are required and applied variously in different fields for metrological purposes and experiments such as atomic-frequency standards, atomic magnetometers, laser-cooling experiments, high-resolution spectroscopy, coherent optical communications, or accurate geophysical measurements using laser interferometers
This paper reports on frequency stabilization of a commercially available distributed feedback (DFB) diode laser system onto the Cs D1 line at 895 nm using standard saturated absorption method
This wavelength was selected because our laser is devoted to be used in a coherent population trapping (CPT) Cs vapor cell clock [18]
Summary
F REQUENCY-STABILIZED laser diode systems are required and applied variously in different fields for metrological purposes and experiments such as atomic-frequency standards, atomic magnetometers, laser-cooling experiments, high-resolution spectroscopy, coherent optical communications, or accurate geophysical measurements using laser interferometers. By combining saturated absorption techniques to reduce acoustic noise and narrow-linewidth (∼100 kHz) extended-cavity diode lasers (ECDLs) [10]–[12]. This paper reports on frequency stabilization of a commercially available DFB diode laser system onto the Cs D1 line at 895 nm using standard saturated absorption method. This wavelength was selected because our laser is devoted to be used in a coherent population trapping (CPT) Cs vapor cell clock [18]. Typical laser frequency stability performances obtained by stabilization against Cs Doppler-free D1 line at 895 nm have never been clearly reported
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