CN-224231600-U - Femtosecond pulse laser light wire control system

Abstract

The utility model discloses a femtosecond pulse laser light wire control system which comprises a laser transmitter, a power meter, a target chamber, a light beam collector, a vacuum pump, an optical fiber probe and an optical fiber spectrometer, wherein a reflecting mirror I and a diaphragm are arranged between the laser transmitter and the power meter, a convex lens I is arranged between the reflecting mirror II and the target chamber, a light transmitting hole is arranged on one side of the target chamber and is opposite to the optical fiber probe, the convex lens II is arranged between the light transmitting hole and the optical fiber probe, the optical fiber probe is connected with the optical fiber spectrometer through an optical fiber, and the optical fiber spectrometer is connected with an upper computer, wherein the vacuum pump is communicated with the inside of the target chamber. The utility model can adjust the size of the laser beam, can controllably adjust the length of the laser light wire, and can obtain the influence of different environments on the spectral signal to noise ratio, thereby providing a stable and reliable basis for the subsequent controllable LIBS experiment.

Inventors

• HAN NING
• ZHAO PEIQIAN
• Fan Genrui
• CHEN SHUYU
• LIU LINLIN
• LIN SHIBIN

Assignees

• 重庆建安仪器有限责任公司

Dates

Publication Date

20260512

Application Date

20250418

Claims (4)

1. 1. The femtosecond pulse laser light wire control system is characterized by comprising a laser transmitter, a power meter, a target chamber, a light beam collector, a vacuum pump, an optical fiber probe and an optical fiber spectrometer; The laser beam collecting device comprises a laser transmitter, a power meter, a reflector I, a diaphragm, a reflector II, a convex lens I, a beam collector, a lens I and a lens I, wherein the light outlet of the laser transmitter is opposite to the power meter, the reflector I is arranged between the laser transmitter and the power meter and is used for reflecting a laser beam; The optical fiber probe is connected with an optical fiber spectrometer through an optical fiber, the optical fiber spectrometer is used for being connected with an upper computer so as to transmit collected data to the upper computer, wherein the light hole is sealed by a transparent material, and the vacuum pump is communicated with the inside of the target chamber and used for adjusting the air pressure in the target chamber.
2. 2. The femtosecond pulse laser light wire control system as set forth in claim 1, wherein the target chamber is filled with nitrogen.
3. 3. The femtosecond pulse laser light wire control system of claim 1, wherein the reflector I and the reflector II are high-reflection mirrors or total reflection mirrors.
4. 4. The femtosecond pulse laser light wire control system of claim 1, wherein the laser beam emitted by the laser emitter has an included angle with a plane of the reflecting mirror I, and the laser beam reflected by the reflecting mirror I has an included angle with the plane of the reflecting mirror II.

Description

Femtosecond pulse laser light wire control system Technical Field The utility model relates to the technical field of optical detection, in particular to a femtosecond pulse laser light wire control system. Background The Laser Induced Breakdown Spectroscopy (LIBS) technology is one of the current detection means for measuring trace elements and performing nondestructive inspection, and the femtosecond pulse laser is focused to reach extremely high power density so as to further bombard target substances (gas, liquid and solid), thereby reaching the detection limit and performing qualitative and quantitative analysis on the target substances. The existing LIBS technology measures the molecular breakdown spectrum of target atoms, and the super-strong ultrashort pulse laser Kerr self-focusing effect and the plasma defocusing effect generated by multiphoton ionization generated by molecular atoms reach dynamic balance to generate laser light wires. The ultra-short femtosecond laser optical fiber has the advantages of high power density, long detection distance, real time and rapidness, but in the actual experimental operation process, the boundary effect of the laser optical fiber is affected due to the influence of laser beam edge jitter and the like, meanwhile, the pulse laser focusing optical fiber is unstable, the light spot edge jitter has a certain influence on the spectrum, the length of the optical fiber cannot be regulated stably and reliably according to the needs in the current experimental process, the influence experiment of different environments on the spectrum cannot be realized according to the needs, and the subsequent LIBS experiment is also affected. Disclosure of utility model Aiming at the defects existing in the prior art, the utility model aims to solve the technical problems existing in the prior art and provide a femtosecond pulse laser optical fiber control system which can adjust the size of a laser beam, can controllably adjust the length of the laser optical fiber and can acquire the influence of different environments on the spectral signal to noise ratio, thereby providing a stable and reliable basis for the follow-up controllable LIBS experiment. In order to solve the technical problems, the technical scheme adopted by the utility model is that the femtosecond pulse laser light wire control system is characterized by comprising a laser emitter, a power meter, a target chamber, a light beam collector, a vacuum pump, an optical fiber probe and an optical fiber spectrometer; The laser beam collecting device comprises a laser transmitter, a power meter, a reflector I, a diaphragm, a reflector II, a convex lens I, a beam collector, a lens I and a lens I, wherein the light outlet of the laser transmitter is opposite to the power meter, the reflector I is arranged between the laser transmitter and the power meter and is used for reflecting a laser beam; The optical fiber probe is connected with an optical fiber spectrometer through an optical fiber, the optical fiber spectrometer is used for being connected with an upper computer so as to transmit collected data to the upper computer, wherein the light hole is sealed by a transparent material, and the vacuum pump is communicated with the inside of the target chamber and used for adjusting the air pressure in the target chamber. Further, the target chamber is filled with nitrogen gas. Further, the reflecting mirror I and the reflecting mirror II are both high reflecting mirrors or total reflecting mirrors. Further, the laser beam emitted by the laser emitter has an included angle with the plane of the reflecting mirror I, and the laser beam reflected by the reflecting mirror I has an included angle with the plane of the reflecting mirror II. Compared with the prior art, the utility model has the following advantages: 1. The light beam (light spot) edge jitter can be reduced by adjusting the light speed diameter through the diaphragm, so that the pulse laser focusing light wire has better stability, light spots with different sizes can be clamped, the excitation ionization molecules and the spectrum intensity information of examples are controlled, and the LIBS spectrum analysis experiment work is more stable and reliable. 2. Through controlling cavity atmospheric pressure size, can make LIBS breakdown spectroscopy experiment realize improving and adjust for LIBS spectral resolution further effectively improves, and can carry out the influence experiment of different atmospheric pressure density gases to spectral signal to noise ratio, provides the basis for follow-up spectral analysis experiment. Drawings Fig. 1 is a schematic diagram of the structure of the present utility model. In the figure, the laser comprises a 1-laser emitter, a 2-power meter, a 3-target chamber, a 4-light beam collector, a 5-vacuum pump, a 6-optical fiber probe, a 7-optical fiber spectrometer, an 8-reflecting mirror I, a 9-diaphragm, a 10-reflecting mirror II,