Laser intensity stability control device and method for Rydberg atom microwave electric field intensity meter

Abstract

The invention discloses a laser intensity stability control device and method for a Rydberg atom microwave electric field intensity meter. An electro-optical liquid crystal retarder is used for realizing stable control on the light intensity of coupling light and detection light of the Rydberg atom microwave electric field intensity meter, so that the measuring precision of the Rydberg atom microwave electric field intensity meter is improved. According to the method, the laser intensity stability of the Rydberg atom microwave electric field intensity meter is improved; the integration of a laser system is facilitated; and the method is clear in principle, simple in structure and easy to implement and apply.

Description

technical field [0001] The invention relates to the field of laser intensity control. More specifically, it relates to a device and method for stabilizing laser intensity of a Rydberg atomic microwave electric field intensity meter. Background technique [0002] The Rydberg atomic microwave electric field intensity meter is a new type of microwave electric field intensity meter, which uses the EIT-AT splitting effect of the Rydberg atom to trace the microwave electric field intensity measurement to the frequency in the SI unit, making the microwave electric field intensity measurement Not only has high accuracy, but also realizes self-calibration. [0003] The Rydberg atomic microwave electric field intensity meter is based on the EIT-AT effect of Rydberg atoms, which is extremely sensitive to the laser intensity, and the stability of the laser intensity plays a vital role in the accuracy of the measurement results. Usually, the Rydberg atomic microwave electric field inte...

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Problems solved by technology

[0004] At present, there are two methods for stabilizing the laser intensity: one is to control the output laser intensity of the laser through direct feedback control of the laser current port. The typical laser intensity stability is 10 -2 The stable control of the laser light intensity will cause the change of the laser frequency; the second is to use the external intensity modulation method to achieve stable control of the laser intensity through feedback control of external optical devices (acousto-optic modulators, etc.). Stability at 10 -3 This method does not affect the laser frequency, but the existing traditional methods are difficult to meet the needs of high-precision Rydberg atomic electric field intensity meters for laser intensity stabilization in terms of stability, integration, and laser intensity stabilization speed.

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