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CARS spectrum detection system and method based on line width adjustment

A spectrum detection and linewidth technology, applied in the field of laser spectroscopy, can solve the problem of being unable to be small and portable, and achieve the effects of compact structure, widening range and low cost

Active Publication Date: 2021-01-29
武汉光谷航天三江激光产业技术研究院有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the current CARS spectroscopy technology mostly uses two or more laser light sources, one of which is used as pump light, and the other laser (usually produced by dye laser or OPO) is used as Stokes light. One laser beam is used as the probe light (or the pump light is used as the probe light at the same time), so at least two lasers or at least one laser and one OPO are required to provide the input laser, and it is not yet small and portable

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  • CARS spectrum detection system and method based on line width adjustment
  • CARS spectrum detection system and method based on line width adjustment
  • CARS spectrum detection system and method based on line width adjustment

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Embodiment 1

[0039] Such as figure 1 As shown, the embodiment of the present invention provides a CARS spectral detection system based on linewidth adjustment, which includes a narrow linewidth seed source laser 1 connected in sequence in an optical path, a laser linewidth adjustment device, a coupling optical path, a pumping optical path, and a gain Light path and detection light path. The narrow linewidth laser generated by the narrow linewidth seed source laser 1 is used as the seed laser, and the linewidth becomes wider after passing through the laser linewidth adjustment device, which affects the backward SBS (stimulated Brillouin scattering, in the process of light scattering, A beam frequency is When the light wave passes through the state, gaseous or solid medium, if there is a component in the scattering spectrum that has a certain frequency shift relative to the incident light , the frequency shift of inelastic scattering corresponds to the frequency of lattice vibration ph...

Embodiment 2

[0042] Such as figure 2 As shown, another embodiment of the present invention is similar to the implementation structure principle, and it has designed the laser line width adjustment device in detail, and the laser line width adjustment device includes a white noise generation source 13, an RF amplifier 15, an adjustable microwave attenuator 14 and Electro-optic modulator 2. Wherein, the white noise generating source 13 is used as a signal source to emit a random electrical signal, the voltage is finely adjusted through the adjustable microwave attenuator 14, and the radio frequency is amplified through the RF amplifier 15, and the amplified noise signal passes through the electro-optical modulator 2 generates an additional optical carrier, which interacts with the seed laser generated by the narrow-linewidth seed source laser 1, and can adjust the linewidth of the seed laser, thereby affecting the backward SBS and SRS intensity ratios. Preferably, the voltage is 32 V, and ...

Embodiment 3

[0048] Such as image 3 As shown, in one embodiment of the present invention, the Raman gain spectrum range of gain fiber 6 is very wide, if Stokes light spectral range cannot cover measured component Stokes light characteristic spectral line, in circulator 5 A section of photonic crystal fiber 16 can be added between the focusing lens 10 to generate supercontinuum white light with wider line width, so as to broaden the range of species measured by the compact CARS spectrometer light source device and detection system.

[0049] This embodiment shows that the present invention has the advantages of small size, low cost, the ability to obtain a collinear light source for a CARS spectrometer without adjustment and high beam quality, and the system is stable and reliable.

[0050] Such as Figure 4 As shown, another embodiment of the present invention provides a CARS spectrum detection method based on linewidth adjustment, comprising the following steps:

[0051] S100: The narro...

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Abstract

The invention discloses a CARS spectrum detection system based on line width adjustment, and the system comprises a narrow-line-width seed source laser (1) and a laser line width adjustment device which are sequentially connected in an optical path; the laser line width adjustment device comprises a white noise generation source (13), an adjustable microwave attenuator (14), an RF amplifier (15),an electro-optical modulator (2), a pump optical path, a coupling optical path, a gain optical path, and a detection optical path, wherein the detection optical path comprises a focusing lens (10), ameasurement cell (11), and a CARS optical detector (12). According to the CARS spectrum detection system based on line width adjustment, the line width of seed laser is adjusted through the laser linewidth adjustment device, and the backward SBS and SRS intensity ratio generated in the optical fiber is adjusted through the method of changing the length of the gain optical fiber, so that the CARSspectrum detection system meets the optimal pump light and Stokes light intensity ratio required by a CARS spectrum measurement device, the light beam quality is good, the spatial resolution of CARS spectrum detection can be improved, and the system has the advantages of being free of light path adjustment, stable, reliable and the like.

Description

technical field [0001] The invention belongs to the application field of the laser spectrum field, and more specifically relates to a CARS spectrum detection system and method based on line width adjustment, which are used to realize a compact CARS spectrometer without adjusting the optical path. Background technique [0002] CARS spectroscopy is a nonlinear laser spectroscopy technique that uses the Raman activity of molecules to obtain spectral signals of molecules in gaseous, liquid and solid states. The CARS signal light is located in the short-wave direction of the pump light, which can avoid fluorescence interference; the directionality is good, which is convenient for collection; and the signal intensity is high, which is convenient for detecting trace species; therefore, CARS spectroscopy is very useful in biological imaging, temperature field measurement and species detection. There are a wide range of applications. [0003] However, the current CARS spectroscopy t...

Claims

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Application Information

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IPC IPC(8): G01N21/65G01J3/44G01J3/02
CPCG01J3/0213G01J3/0218G01J3/44G01N21/65
Inventor 袁红杨笛吴鹏武春风李强姜永亮刘厚康宋祥韩鎏徐志
Owner 武汉光谷航天三江激光产业技术研究院有限公司
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