Development of two-micron multi-pulse laser for remote sensing

2020 Fiscal Year Final Research Report

• Project/Area Number: 19K15471
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 30020:Optical engineering and photon science-related
• Research Institution: National Institute of Information and Communications Technology
• Principal Investigator: Aoki Makoto 国立研究開発法人情報通信研究機構, 電磁波研究所リモートセンシング研究室, 研究員 (40744652)
• Project Period (FY): 2019-04-01 – 2021-03-31
• Keywords: 差分吸収ライダー / ライダー / リモートセンシング / パルスレーザ / Tm,Ho:YLF

Outline of Final Research Achievements

An eye-safe two-micron multi-pulse laser and its wavelength locking technique have been developed for simultaneously measuring various meteorological parameters. The diode-side-pumped Tm,Ho:YLF master oscillator power amplifier (MOPA) was developed. A Q-switched pulse energy of 105.4 mJ was achieved at a pulse repetition frequency of 100 Hz, corresponding to an average output power of 10.54 W. The wavelength locking technique for the pulse laser was realized by using a combination of the Pound-Drever-Hall (PDH) and optical phase-locked loop (OPLL) techniques. In terms of the spectral absorption characteristics, the optimal wavelengths for water vapor measurement were selected to be 2050.550 and 2051.103 nm. The long-term wavelength stability of the locked laser of < 0.2 pm, which corresponds to 14 MHz, was achieved.

Free Research Field

光計測

Academic Significance and Societal Importance of the Research Achievements

本研究の実施により、パルスレーザ開発において従来の世界最高出力（7.28 W）の100 mJ級Tm,Ho共添加固体レーザの出力を凌駕するレーザ（10.54 W）の開発に成功した。
本研究で開発を進めた装置をさらに発展させれば、マルチ気象データ（風、水蒸気、温度、大気微量成分等）を広範囲かつ同時に観測できる。そのため、同装置を実用化できれば、現代社会の様々な課題（豪雨災害、地球環境問題、カーボンニュートラル等）の解決に貢献することが可能である。