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Abstract
In order to polarize 87Rb vapor effectively with ultranarrow linewidth diode laser, we studied the polarization as a function of some parameters including buffer gas pressure and laser power. Moreover, we also discussed the methods which split or modulate the diode laser frequency so as to pump the two ground hyperfine levels efficiently. We obtained some useful results through numerical simulation. If the buffer gas pressure is so high that the hyperfine structure is unresolved, the polarization is insensitive to laser frequency at peak absorption point so frequency splitting and frequency modulation methods do not show improvement. At low pressure and laser power large enough, where the hyperfine structure is clearly resolved, frequency splitting and frequency modulation methods can increase polarization effectively. For laser diodes, frequency modulation is easily realized with current modulation, so this method is attractive since it does not add any other components in the pumping laser system.
Highlights
INTRODUCTIONSpin state manipulation in vapors of alkali-metal atoms with light has attracted wide attentions and produced many applications, ranging from atomic clock[1] and atomic magnetometer[2,3] to hyperpolarized magnetic resonance imaging[4] and spin filter.[5,6] In most of these applications, the alkali-metal atoms are sealed in glass cells and heated into vapor so as to be optically pumped with resonant light.[2,3,4,5,6,7,8,9,10] The glass cell may contains some kinds of gas, such as noble gas to suppress diffusion, nitrogen to quench radiation trapping
In order to polarize 87Rb vapor effectively with ultranarrow linewidth diode laser, we studied the polarization as a function of some parameters including buffer gas pressure and laser power
If the buffer gas pressure is so high that the hyperfine structure is unresolved, the polarization is insensitive to laser frequency at peak absorption point so frequency splitting and frequency modulation methods do not show improvement
Summary
Spin state manipulation in vapors of alkali-metal atoms with light has attracted wide attentions and produced many applications, ranging from atomic clock[1] and atomic magnetometer[2,3] to hyperpolarized magnetic resonance imaging[4] and spin filter.[5,6] In most of these applications, the alkali-metal atoms are sealed in glass cells and heated into vapor so as to be optically pumped with resonant light.[2,3,4,5,6,7,8,9,10] The glass cell may contains some kinds of gas, such as noble gas to suppress diffusion, nitrogen to quench radiation trapping.
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