Laser frequency stabilization method and its device

A laser and frequency stabilization technology, applied in lasers, laser components, optics, etc., can solve problems such as locking accuracy contradictions, technical difficulties, interference, etc., and achieve improved sensitivity and spectral detection accuracy and stability, and high detection sensitivity , Improve the effect of locking precision

Inactive Publication Date: 2004-12-22
EAST CHINA NORMAL UNIV
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Problems solved by technology

[0006] The object of the present invention is to provide a new laser frequency stabilization method and its device, to solve the requirement of optical modulation frequency equal to the mode interval frequency of the resonator in the noise-immune resonator-enhanced spectroscopy technology, and the frequency should be as high as hundreds of megabytes to 1GHz. Difficult and costly problems; and in ring cavity enhanced modulation transfer spectroscopy, the locking signal between the laser and the resonant cavity and the acquisition of molecular spectral signals in the cavity all come from a modulation frequency. The frequency is faced with the contradiction between the signal / noise ratio of the molecular spectrum and the locking accuracy between the laser and the optical resonator. At the same time, the two servo control signals come from the same beam of light and the same modulation frequency. When used for frequency stabilization servo control, the two servos The control system will generate interference, which affects the performance of the frequency-stabilized laser

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  • Laser frequency stabilization method and its device

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Effect test

Embodiment 1

[0022] frequency is f 0 The laser beam is divided into two beams of light with orthogonal polarization directions by the polarization beam splitter prism, one of which passes through the dual-frequency electro-optic modulator (Δ and δ), correspondingly generating two sets of modulation sidebands, which are respectively used for the relative optical resonator Laser frequency locking and molecular modulation transfer spectroscopy signal detection. The ring cavity adopts a four-mirror ring optical resonator, and the optical phase modulation frequency Δ used to lock the cavity is twice the line width of the ring cavity, so that the sideband is located outside the line width of the cavity, increasing the dispersion signal of the cavity At the same time, the influence of the sideband on the spectral signal is also reduced. When the modulated light beam is coupled to the ring-type optical resonator, the reflected light enters the detector, and then demodulated by the double-balanced...

Embodiment 2

[0024] frequency is f 0 The laser beam is divided into two beams of light with orthogonal polarization directions by the polarization beam splitter prism, one of which passes through the dual-frequency electro-optic phase modulator (Δ and δ), correspondingly generating two sets of modulation sidebands, which are respectively used in the optical resonator Locking of relative laser frequency and signal detection of molecular modulation transfer spectroscopy. The process is basically the same as that in Embodiment 1, except that the optical phase modulation frequency Δ used to lock the cavity is 5 times the line width of the ring cavity, and δ is 0.9 times the line width of the ring.

Embodiment 3

[0026] frequency is f 0 The laser beam is divided into two beams of light with orthogonal polarization directions by the polarization beam splitter prism, one of which passes through the dual-frequency electro-optic phase modulator (Δ and δ), correspondingly generating two sets of modulation sidebands, which are respectively used in the optical resonator Locking of relative laser frequency and signal detection of molecular modulation transfer spectroscopy. The process is basically the same as that in Embodiment 1, except that the optical phase modulation frequency Δ used to lock the cavity is 3 times the linewidth of the ring cavity, and δ is 0.7 times the spectral linewidth.

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Abstract

The invention relates to a laser frequency stabilizing method and a device, especially is a dual-frequency modification ring cavity enhancing and modifying laser frequency stabilizing method and device, which belongs to accurate laser spectrum technology, accurate laser frequency stabilizing technology and accurate gauge standard technology field. The invention divides the laser beam into two orthogonal beams along the polarization direction through the polarization beam divider, one beam is used for the lock between the ring optical resonance cavity and the laser frequency, another beam is used to realize high accuracy lock between the laser frequency and the spectrum. The character of the laser frequency stabilizing device lies in: two radio frequency signals drive an electric-optic modifier to carry on dual-frequency modification to the laser beam, forms two independent servo control system, in order to realize the lock accuracy of the laser frequency.

Description

technical field [0001] The invention relates to a laser frequency stabilization method and a device for realizing the frequency stabilization method, in particular to a dual-frequency modulation ring cavity enhanced modulation transfer laser frequency stabilization method and its device, belonging to precision laser spectrum technology, precision laser frequency stabilization Technical field of technology and precision metrology standards. Background technique [0002] The first generation laser frequency stabilization method is the third harmonic laser frequency stabilization method, and the second generation developed later is the modulation transfer spectrum laser frequency stabilization method. Compared with the third harmonic laser frequency stabilization method, the modulation transfer laser frequency stabilization method has the advantages of high detection sensitivity, small spectral baseline shift, and no frequency modulation of the laser. Using...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/35H01S3/13
Inventor 马龙生毕志毅
Owner EAST CHINA NORMAL UNIV
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