Total optical Rb frequency marking method and system

A rubidium frequency standard and optical technology, which is applied in the field of all-optical rubidium frequency standard method and its system, can solve the problems that the performance is easily affected by the mechanical structure and precision, weight and volume limitations, etc., so as to avoid the influence of the mechanical system and reduce the weight The effect of high volume and frequency locking precision

Inactive Publication Date: 2004-08-25
SOUTH CHINA NORMAL UNIVERSITY
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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 excit...

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  • Total optical Rb frequency marking method and system
  • Total optical Rb frequency marking method and system
  • Total optical Rb frequency marking method and system

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Embodiment Construction

[0021] The present invention will be further described in detail below in conjunction with the drawings and embodiments.

[0022] Such as figure 1 with 2 As shown, a ∧-shaped atom three-level system, if the frequency is ω 13 And ω 23 The laser makes the ultrafine energy levels of the ground state of atoms |1> and |2> couple with the optical energy level |3>, and there will be a coherent resonance phenomenon between the energy levels |1> and |2>. In addition, if the pump laser used is modulated by a pulse with a repetition frequency of υ, and its pulse width τ satisfies ω 12 τ≤1, then whenever n2πυ=ω 12 (Where n = 1, 2, 3...), the coherence generated by each pulse will strengthen each other, so that between the energy levels |1> and |2> there will be a center frequency of ω 12 The sharp coherent resonance can obtain a very narrow resonance line. On the atomic frequency standard, the use of this ultra-fine coherent resonance can not only obtain a much narrower discriminating spectr...

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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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Application Information

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IPC IPC(8): G02F1/00H01S5/00
Inventor 孙番典杨世琪刘琼发孙汪典吴先球周卫星
Owner SOUTH CHINA NORMAL UNIVERSITY
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