Home Science What to Know About Air Lasing, The New Tool for Atmospheric Detection?

What to Know About Air Lasing, The New Tool for Atmospheric Detection?

Rapid laser technology provides new techniques for remotely detecting atmospheric pollution and harmful biochemical agents due to their unique advantages of high power, short pulse length, and broad spectral coverage.

In particular, air lasing shows promise in the distant sensitivity of the atmosphere due to its ability to produce magnifying lightless holes in the open air. It is suitable as a space diagnostic probe.

Recently, a team of researchers from the Shanghai Institute of Optics and Fine Mechanics (SIOM) of the Chinese Academy of Sciences (CAS) proposed a Raman spectroscopy assisted by air, which detects volume measurement and simultaneous detection of two greenhouse gases, as well as identification CO2 isotopes. The detection sensitivity is up to 0.03%, and the decrease in signal fluctuations is about 2%.

The work was published in Ultrafast Science on Apr. 8.

The indirect interaction of the femtosecond laser with air molecules stimulates the visual acuity of nitrogen ion molecules. It benefits the seed growth more than 1,000 times, resulting in 428 nm air lasing with a diameter of 13 cm-1.

Meanwhile, the spectral diameter of the pump laser reaches 3800 cm-1 after indirect distribution, which is more than one magnitude greater than the laser diameter of the incident.

It, therefore, fuels the excitement of the vibrations associated with most pollutant cells and greenhouse gases. When air lasing mixes with vibrating molecules, it successfully produces a corresponding Raman scattering. By recording the frequency difference of the Raman signal and the perspective lasing, which are Raman fingerprints, molecular identity information can be determined.

Raman spectroscopy associated with air-lasing-assisted combines the benefits of femtosecond laser and air lasing. The Femtosecond laser has a broad spectral implant and a short pulse length, which can enhance the concurrent vibration of multiple molecules at once. Air lasing has a small spectral width, which allows the separation of the Raman fingers of different molecules. Therefore, this process can meet the multi-component equation and chemical specification requirements.

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