Excited state atom filter receiving device for pumping laser atom frequency stabilization

Abstract

The invention discloses an excited state atom filter receiving device for pumping laser atom frequency stabilization. The device consists of a receiving telescope (1), an atom filter unit (2), a first photoelectric detector (3) and an atom frequency stabilization pumping laser unit (4). Resonance fluorescence generated by atoms is used for carrying out feedback frequency stabilization on a pumping laser, the work frequency of the pumping laser is stable without drifting, and further, low excited state atom number density and super-fine energy level distribution is stable, so the transmission spectrum type stability and the transmittance of an excited state atom filter are improved.

Description

technical field [0001] The invention relates to background light suppression spectral filter receiving technology, in particular to atomic mechanism ultra-narrow spectral filter receiving technology. Background technique [0002] In an open space laser communication system, the interference of background light is one of the most important factors affecting the signal-to-noise ratio. The transmission bandwidth of commonly used interference filters is usually on the order of nanometers, which is different from the picometer-level or even narrower line of the emitted laser. Compared with the bandwidth of the interference filter, the bandwidth of the interference filter is 3 orders of magnitude wider, so that a large amount of background interference light is mixed into the received signal. In order to better suppress the interference of background light, people use birefringent filters with narrower bandwidth to narrow the bandwidth to the level of angstroms; in order to furthe...

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Problems solved by technology

Since the excited state atomic filter works between the low excited state and the high excited state transition energy level, to make the excited state atomic filter work, first pump the atoms from the ground state to the low excited state with pump light state, the frequency stability of the pump laser directly affects the fluctuation of the atomic number density in the excited state and the density distribution at each hyperfine energy level, and the fluctuation and distribution of the density will directly affect the transmittance of the optical filter And the stability of the filter transmission spectrum makes it difficult to guarantee the transmittance and transmission spectrum of the filter

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