chanelink logo
CHANELINK
English

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

942
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

  • This perovskite solar cell laser equipment company has received another round of financing

    Recently, Lecheng Intelligent Technology (Suzhou) Co., Ltd. (hereinafter referred to as "Lecheng Intelligent") completed a strategic financing round of tens of millions of yuan, which is exclusively invested by Dongfang Fenghai Capital. The financing funds will mainly be used for technology research and development, laboratory construction, and talent recruitment.This is the second round of financ...

    2023-10-10
    See translation

  • The Glory of Laser and the Odyssey of "Deep Technology"

    The British engineering and construction company Metz Group has a delegation in Spain to be responsible for the expansion and renovation of the central laser facility at Rutherford Appleton Laboratory near Oxford. More commonly, the construction of the powerful laser Vulcan 20-20 has just been obtained, with a delivery date of 2029.It will emit a main excitation beam that is billions of times larg...

    2023-12-09
    See translation

  • The acoustooptic modulation of gigawatt level laser pulses in ambient air can be applied to other optical components such as lenses and waveguides

    An interdisciplinary research group, including the German synchrotron radiation accelerator DESY and the Helmholtz Institute in Jena, Germany, reported that invisible gratings made of air not only are not damaged by lasers, but also maintain the original quality of the beam.The relevant research has been published in Nature Photonics under the title of "Acousto opt modulation of gigawatt scale las...

    2023-10-12
    See translation

  • Using attosecond pulses to reveal new information about the photoelectric effect

    Scientists from the Stanford National Accelerator (SLAC) laboratory of the US Department of Energy have revealed new information about the photoelectric effect using attosecond pulses: the delay time of photoelectric emission is as long as 700 attosecond, far exceeding previous expectations. The latest research challenges existing theoretical models and helps to reveal the interactions between ele...

    2024-09-02
    See translation

  • The Asia Photonics Expo will be held in Singapore from February 26th to 28th, 2025

    The Asia Photonics Expo (APE), as an internationally leading comprehensive brand promotion and business negotiation platform for optoelectronics, will be grandly held from February 26 to 28, 2025 at the L1 exhibition hall of the Sands Expo&Convention Centre in Singapore. As the top event in the field of optoelectronics, APE Asia Optoelectronics Expo will focus on cutting-edge innovative techno...

    01-03
    See translation