chanelink logo
CHANELINK
English

Enhanced laser heterodyne spectroscopy contributes to the measurement of atmospheric greenhouse gases

1065
2023-10-25 15:48:05
See translation

The research team led by Professor Gao Xiaoming of the Chinese Academy of Sciences Hefei Institute of Physical Sciences has improved the measurement accuracy of atmospheric greenhouse gases by using erbium-doped fiber amplifier assisted laser heterodyne radiometer.

The study was published in the Journal of Optics and was selected as an editor's selection.

LHR is renowned for its high sensitivity and spectral resolution, and has become the next generation of lightweight satellite payloads. However, during the scanning process, signals measured by heterodyne radiometers often encounter issues such as reduced baseline slope and signal-to-noise ratio, which can affect measurement accuracy.

In this study, researchers developed a near-infrared laser heterodyne spectroscopy detection scheme based on EDFA.
By adjusting the EDFA for automatic power control, researchers successfully amplified and stabilized the power of the local oscillator DFB laser, thereby significantly reducing baseline fluctuations. This optimization significantly improves the accuracy of the processed atmospheric transmission spectrum.

By using EDFA with automatic power locking function, the LHR can be operated in a state dominated by shot noise during scanning. By eliminating errors caused by baseline slope, EDFA assisted LHR significantly improves its performance.

"This optimization enables LHR to operate in a state dominated by shot noise during the scanning process, "said team member Dr. Li Jun.

In the experimental measurement of atmospheric CO, EDFA assisted LHR was used for the transmission spectrum, and the signal-to-noise ratio of the heterodyne signal was increased by three times.

"These results demonstrate the effectiveness of EDFA assisted LHR in achieving higher accuracy and precision in atmospheric gas measurement, "Dr. Li said.

The team stated that this discovery can improve ground level LHR remote sensing and enhance greenhouse gas knowledge and monitoring.

Related Recommendations

  • The University of California has developed a pioneering chip that can simultaneously carry lasers and photonic waveguides

    A team of computer and electrical engineers at UC Santa Barbara, in collaboration with several colleagues at Caltech and another colleague at Anello Photonics, has developed a first-of-its-kind chip that can carry both laser and photonic waveguides. In a paper published in the journal Nature, the team describes how they made the chip and how it worked during testing.With the advent of integrated c...

    2023-08-10
    See translation

  • Using laser welding technology to manufacture rotor shafts at the speed of light

    How can EMAG Laser Technology accelerate the production of critical powertrain components using its flagship product ELC 6 system?The rapid popularity of electric vehicles worldwide indicates that production planners must increase their efforts in producing key components of electric vehicles, particularly the rotor shaft. The importance of the rotor shaft as the core component for converting elec...

    2024-07-17
    See translation

  • Measurement of Fine Structure and Spin Interaction of Quantum Materials through TriVista High Resolution Spectral Measurement System

    backgroundThe Jörg Debus team from the Technical University of Dortmund in Germany is dedicated to researching optical quantum information processing and quantum sensing in materials with potential applications. The team mainly studies the fine structure of materials under light fields, such as quantum dots, quantum effects of two-dimensional materials, semiconductor defects in diamonds, and ...

    2024-03-11
    See translation

  • Industrial blue light laser developer Nuburu adds new director

    Not long ago, Nuburu, the developer of industrial blue light lasers, encountered a personnel change controversy. The departure of two senior executives from its board of directors resulted in a shortage of board members, and the originally scheduled special meeting for financing proposals was forced to be cancelled as a result. Recently, Nuburu announced two new director appointments that will tak...

    01-10
    See translation

  • Significant progress has been made in the manufacturing and measurement of EUV lithography light source collection mirrors

    Summary:To filter out infrared light from the driving light source in the extreme ultraviolet lithography (EUVL) light source system, a rectangular grating structure needs to be fabricated on the surface of the collection mirror. However, the collection mirror grating usually undergoes deformation during the manufacturing process, resulting in a decrease in filtering efficiency. The process errors...

    04-02
    See translation