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理论研究了基于级联四波混频系统的信噪比(SNR)优化。级联四波混频过程包括相敏和非相敏级联两种方式,其中非相敏级联系统的探测光强度始终被放大,同时SNR始终被降低;而相敏级联系统的探测光强度可以被放大或减小,这取决于两个铷池内光场的总相位调控。在相同增益条件下,相敏级联四波混频系统的有效增益比非相敏级联系统的高。另外,当两个铷池内光场的总相位等于0或者2π时,相敏级联四波混频系统中探测光的强度可以呈最大倍数放大,且SNR也被提高到最大。
The signal-to-noise ratio (SNR) optimization based on cascaded four-wave mixing system is theoretically studied. The cascaded four-wave mixing process includes two methods: phase-sensitive and non-phase-sensitive cascaded, in which the detection light intensity of the non-phase-sensitive cascaded system is always amplified and the SNR is always reduced; meanwhile, the detection light intensity Can be amplified or reduced, depending on the total phase modulation of the light field within the two rubidium cells. Under the same gain conditions, the effective gain of the phase-sensitive cascaded four-wave mixing system is higher than that of the non-phase-sensitive cascaded system. In addition, when the total phase of the optical field in two rubidium cells is equal to 0 or 2π, the intensity of the probe light in the phase-sensitive cascaded four-wave mixing system can be amplified by the maximum magnification and the SNR is also increased to the maximum.