Total optical Rb frequency marking method and system

Abstract

The invention is an all-optical Rb frequency standard method and system. The method: firstly, adjusting the pump laser to the wavelength corresponding to Rb D2 line; then modulating semiconductor laser by radio signal to produce optical component needed to excite coherent resonance, and using two proper side bands to excite Rb 0-0 ultrafine coherent resonant transition; when the frequency of fine crystal oscillator deviates, the atomic system outputs a deviation correcting signal to control VCO, to make the VCO return to original frequency. The system is composed of semiconductor laser diode, Rb atomic physical system, optical signal detecting and amplifying device and high-precision constant temperature VCO, which are linked with one another. It uses Rb atomic coherent resonant transition chart line to identify the frequency, and the frequency locking is higher; needs no mechanical exciting system, avoiding the effect of mechanical system; uses commercial fractional laser diode as excitation source.

Description

Technical field [0001] The invention relates to the technical field of semiconductor lasers, in particular to an all-optical rubidium frequency standard method and system thereof. Background technique [0002] Rubidium frequency standard (rubidium atomic frequency standard) is a high-precision, high-stability frequency reference signal source. It uses the energy level transition spectrum of rubidium to discriminate and lock the high-precision constant-temperature voltage-controlled crystal oscillator so that its output frequency can reach a high degree of stability. It is suitable for time, frequency measurement, satellite positioning, radio navigation, and digital communication networks. Application fields such as synchronization, as well as many other aspects of scientific research and high-level higher education teaching needs. [0003] The traditional rubidium frequency standard discriminates the frequency with the linear absorption spectrum of rubidiu...

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Problems solved by technology

[0003] The traditional rubidium frequency standard uses the linear absorption spectral line of rubidium atoms for frequency identification, and the corresponding spectral line width is relatively wide; the spectral lamp in the form of high-frequency electrodeless discharge exciting rubidium bubbles to emit light is used as the optical excitation source, and special rubidium lamps and electrodeless discharge are required. Power supply; use a mechanical microwave resonator to act on the microwave signal that excites the transition to the rubidium absorbing bubble; the performance is easily affected by the mechanical structure and precision, and the weight and volume are also limited

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