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Sum-frequency and modulation transfer spectrum-based 1,572nm frequency stabilization system and method

A frequency stabilization and spectrum technology, applied in the field of 1572nm frequency stabilization system, achieves the effect of simple device, high frequency stabilization accuracy and large absorption coefficient

Active Publication Date: 2018-02-02
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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Problems solved by technology

There is no method to achieve 1572nm frequency stabilization by using the sum-frequency technology and the hyperfine spectral lines of iodine molecules

Method used

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  • Sum-frequency and modulation transfer spectrum-based 1,572nm frequency stabilization system and method

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with the embodiments and accompanying drawings, but the protection scope of the present invention should not be limited thereby. see figure 1 , figure 1 It is a structural block diagram of the 1572nm frequency stabilization system based on sum-frequency and modulation transfer spectrum of the present invention. As shown in the figure, the 1572nm frequency stabilization system based on sum-frequency technology and modulation transfer spectrum includes a 1064nm laser, a 1064nm beam splitter, and a 532nm frequency doubling crystal , 532nm beam splitter, 532nm electro-optic phase modulator, 532nm first collimator lens, 532nm polarization beam splitter prism, first iodine cell, 532nm first collimator lens, 532nm focusing mirror, 532nm photodetector, first mixer , the first signal generator, the first electronic servo system, 1572nm laser, 1572nm beam splitter, wavelength division multiplexer, 634nm sum fre...

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Abstract

The invention discloses a sum-frequency and modulation transfer spectrum-based 1,572nm frequency stabilization system apparatus which can be applied to CO<2> gas concentration detection laser radar. The frequency stabilization system comprises a 1,064nm laser, a 1,064nm beam splitter, 532nm frequency doubling crystal, a 532nm beam splitter, a 532nm electric-optical phase modulator, a 532nm first collimation lens, a 532nm polarized beam-splitting prism, a first iodine pool, a 532nm first collimation lens, a 532nm focusing lens, a 532nm photoelectric detector, a first frequency mixer, a first signal generator, a first electronic servo system, a 1,572nm laser, a 1,572nm beam splitter, a wavelength division multiplexer, 634nm sum-frequency crystal, a 634nm beam splitter, a 634nm electric-optical phase modulator, a 634nm first collimation lens, a 634nm polarized beam-splitting prism, a second iodine pool, a 634nm second collimation lens, a 634nm focusing lens, a 634nm photoelectric detector, a second frequency mixer, a second signal generator and a second electronic servo system. Direct utilization of a CO<2> long-absorption-pool frequency stabilization system is avoided, so that the size is reduced; and in addition, the iodine molecule fine absorption spectrum is narrower than CO<2> molecule absorption line, so that frequency stability is improved.

Description

technical field [0001] The invention belongs to the technical field of laser frequency stabilization, in particular to 2 1572nm frequency stabilization system based on sum frequency and modulation transfer spectrum in laser sources that require stable laser frequency in concentration measurement lidar. Background technique [0002] CO 2 Gas concentration detection has become a crucial part of atmospheric environment monitoring in recent years. for CO 2 At present, gas concentration detection mostly adopts the method of integral path differential absorption lidar, and the wavelengths are mainly 1.5 micron and 2 micron. This method can realize all-day real-time detection, but requires very high frequency stability of the laser. Traditional frequency stabilization methods use CO 2 The absorption line is used as a frequency reference, and the method of frequency modulation is used to achieve frequency stabilization, but in the 1.5 micron band CO 2 The coefficient of is low...

Claims

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Application Information

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IPC IPC(8): H01S3/13
CPCH01S3/13H01S3/1305
Inventor 陈卫标杜娟陈迪俊刘继桥侯霞
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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