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Acta Sinica Quantum Optica

A Simple Experiment System for Laser Cooling and Trapping ~(87)Rb Atom

WU Haibin

Published Jan 1, 2005• 0 citations
OpenAlex

Abstract

In this paper, a simple setup of laser cooling and trapping of Rb atom is presented. By using the technique of injection locking, we have gained the cooling and trapping laser whose wavelength is 780 nm (single frequency, frequency fluctuation 2 MHz , tunable range～4.5 GHz), and output power is about 60 mW. With applying a magnetic field to the saturated absorption spectrum, the trapping laser frequency which is detuned a desired amount via Zeeman effect is locked. The cooling and trapping of Rb atom is obtained in the MOT.

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Conference on Lasers and Electro-Optics•Nov 27, 2002•4 citations
In this paper, a simple setup of laser cooling and trapping of Rb atom is presented. By using the technique of injection locking, we have gained the cooling and trapping laser whose wavelength is 780 nm (single frequency, frequency fluctuation 2 MHz , tunable range～4.5 GHz), and output power is about 60 mW. With applying a magnetic field to the saturated absorption spectrum, the trapping laser frequency which is detuned a desired amount via Zeeman effect is locked. The cooling and trapping of Rb atom is obtained in the MOT.
We report a frequency stabilization technique of a diode laser in a Doppler-free atomic transition used for obtaining the magneto-optical trapping of Rb atoms. This technique, based on side locking to an atomic transition using a servo controller, is very simple and can be implemented straightforwardly to lock the laser at the red detuned frequency position required for laser cooling experiments. The number of trapped atoms and the temperature of the cold cloud have been determined. The effect of trapping the magnetic field on the cloud radius has also been analyzed.
We report the experimental realization of a 88Sr magneto-optical trap (MOT) operating at the wavelength of 461 nm. The MOT is loaded via a 32 cm long spin-flip type Zeeman slower which enhances the MOT population by a factor of 22. The total laser power available in our experiment is about 300 mW. We have trapped 1.6 × 108 88Sr atoms with a 679nm and 707 nm repumping laser. The two repumping lasers enhance the trap population and trap lifetime by factors of 11 and 7, respectively. The 88Sr cloud has a temperature of about 2.3 mK, measured by recording the time evolution of the absorption signal.
Abstract The realization of compact high-power narrow-linewidth laser sources in the visible range has been a long-standing interest for the atomic physics community, especially in the field of laser cooling and trapping of alkaline-earth and alkaline-earth-like atoms. We report a simple master-slave injection-locked laser system capable of generating 500 mW at 460.86 nm with a linewidth of 1.6 MHz to realize magneto-optical trapping of strontium atoms on the 5s2 1S0−5s5p 1P15s^{2} \ ^{1}\mathrm {S}_{0}-5s5p \ ^{1}\mathrm {P}_{1}5s2 1S0​−5s5p 1P1​ 5 s 2 1 S 0 - 5 s 5 p 1 P 1 transition. The master laser used is an external cavity diode laser built with an anti-reflection coated laser diode in a Littrow configuration and the slave laser is built with a recently launched single mode high power GaN laser diode. We characterized the frequency noise, injection stability, spectral purity and relative intensity noise of the laser system. The reported laser system is used routinely to produce 10710^7107 10 7 strontium atoms at a temperature of 10 mK in a magneto-optical trap. The laser system offers a prominent alternative to the existing frequency-doubled laser systems in terms of cost, design flexibility, electrical power consumption, ease of scaling, intensity stability, and frequency tunability. The proposed system is also an effective solution for space-based experiments where a laser system’s size, weight, and electrical power consumption are crucial design parameters.
Summary form only given. We have constructed a prototype of an /sup 87/Rb fountain clock. We collect 10/sup 10/ /sup 87/Rb atoms in a vapor cell magneto-optic trap (MOT). The laser system for trapping and cooling is entirely solid state--a grating stabilized laser injects a separate slave laser for each of the six beams of the MOT. We launch the atoms by frequency shifting the three downward propagating laser beams and then increasing the detuning and gradually reducing the intensity of the slave lasers to adiabatically cool the atoms to low temperatures in the fountain.