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A small alkali metal optical clock based on modulation transfer spectrum frequency stabilization and its control method

A technology of alkali metals and optical clocks, applied to instruments using atomic clocks, etc., can solve problems such as high and low frequency noise, limitation, laser output frequency and amplitude influence, and achieve the effect of avoiding the interference of low frequency noise

Active Publication Date: 2019-06-07
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the addition of the modulation signal, the laser output frequency and amplitude are affected, and additional noise is introduced
Polarization spectroscopy is an atomic spectroscopy technique that does not require a modulation mechanism to generate an error signal, but its wider bandwidth will introduce higher low-frequency noise, and the actual zero point value will change with changes in optical power and other factors change, and thus limited

Method used

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  • A small alkali metal optical clock based on modulation transfer spectrum frequency stabilization and its control method
  • A small alkali metal optical clock based on modulation transfer spectrum frequency stabilization and its control method
  • A small alkali metal optical clock based on modulation transfer spectrum frequency stabilization and its control method

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Effect test

Embodiment 1

[0034] Such as figure 1As shown, the alkali metal small optical clock based on the modulation transfer spectrum frequency stabilization of this embodiment includes: a laser 1, a first half-wave plate 2, a second half-wave plate 4, a third half-wave plate 12, and a first polarization beam splitter 3. Alkali metal atom, glass bubble 6, second polarization beam splitter prism 9, phase modulator 13, magnetic shielding box 7, photodetector 16, mixer 17, signal generator 18, servo feedback circuit 19 and laser power supply 20 Wherein, the heating element 8 is wound on the outer wall of the glass bubble, and the glass bubble 6 is filled with alkali metal atoms and buffer gas, and the glass bubble 6 is placed in the magnetic shielding box 7; the laser power supply 20 drives the laser 1 to emit laser light; the laser passes through the first half-wave Plate 2 is divided into two laser beams with unequal intensity by the first polarization beam splitter 3, and the intensity of the two l...

Embodiment 2

[0047] In this embodiment, the first attenuator 5 and the second attenuator 14 are respectively placed on the optical path where the probe light and the pump light do not enter the glass bubble, and the light intensities of the probe light and the pump light are independently controlled respectively. The light intensity of the light and the probe light makes the slope at the center frequency of the error signal demodulated by the mixer 17 the largest, so that the locking effect of the laser frequency is optimal. Moreover, a fourth half-wave plate 21 is arranged on the optical path of the pump light, and the fourth half-wave plate adjusts the polarization direction of the linearly polarized pump light to be parallel to the optical axis direction of the phase modulator, thereby ensuring pure phase modulation The occurrence of the process is to avoid the influence of mechanisms such as residual amplitude modulation, and others are the same as in the first embodiment.

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Abstract

The invention discloses an alkali metal small light lock based on modulation transfer spectrum frequency stabilization and a control method thereof. The four technologies of an ultra-narrow linewidth interference filter extended cavity semiconductor laser, a modulation transfer spectrum, a narrow linewidth alkali metal atom transition spectral line and rapid phase modulation feedback are applied in an integrated mode, the high-stability small laser frequency standard is creatively achieved, and laser wavelength emitted by the laser is locked on a transition spectrum of alkali metal atoms; the light intensity of detection light and the light intensity of pump light can be independently controlled to better achieve locking of laser frequency; the modulation transfer spectrum technology can effectively avoid interference of low-frequency noise, and meanwhile a more flat back substrate is arranged. Leap type increase of performance indexes is brought through integrated innovation, the second-order stability of the achieved high-stability small laser frequency standard reaches 10 to 14, and stability indexes exceed all other waveband light frequency quantum frequency standards and length standards of existing international alkali atoms by two orders of magnitude.

Description

technical field [0001] The invention belongs to the technical field of atomic clocks and frequency standards, and in particular relates to a small alkali metal optical clock based on modulation transfer spectrum frequency stabilization and a control method thereof. Background technique [0002] With the rapid development of semiconductor laser technology and the continuous improvement of semiconductor laser performance, semiconductor lasers are widely used in basic research fields such as laser spectroscopy, laser cooling, atomic and molecular physics, and optical frequency atomic clocks. The output frequency of a free-running semiconductor laser is an irregular quantity that changes with time. Affected by fluctuations in parameters such as temperature and current, the frequency will have a large drift and broaden. With the pursuit of higher stability in basic research fields such as optical frequency atomic clocks, higher requirements are placed on the performance of lasers...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G04F5/14
CPCG04F5/14
Inventor 陈景标张盛楠陈大勇缪培贤涂建辉
Owner PEKING UNIV
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