Development of coherent 2-μm differential absorption and wind lidar with laser frequency offset locking technique

2010 ◽  
Author(s):  
S. Ishii ◽  
K. Mizutani ◽  
H. Fukuoka ◽  
T. Ishikawa ◽  
P. Baron ◽  
...  
Keyword(s):  
Laser Frequency ◽  
Frequency Offset ◽  
Differential Absorption ◽  
Wind Lidar

scholarly journals Partial CO2 Column-Averaged Dry-Air Mixing Ratio from Measurements by Coherent 2-μm Differential Absorption and Wind Lidar with Laser Frequency Offset Locking

2012 ◽  
Vol 29 (9) ◽  
pp. 1169-1181 ◽  
Author(s):  
Shoken Ishii ◽  
Kohei Mizutani ◽  
Philippe Baron ◽  
Hironori Iwai ◽  
Ryoko Oda ◽  
...  
Keyword(s):  
Laser Frequency ◽  
Frequency Offset ◽  
Detection Sensitivity ◽  
Single Frequency ◽  
Differential Absorption ◽  
Airborne Measurements ◽  
Dry Air ◽  
Air Mixing ◽  
Wind Lidar

Abstract A coherent 2-μm differential absorption and wind lidar (Co2DiaWiL) with a 2-μm single-frequency Q-switched laser with laser frequency offset locking was used for long-range CO2 measurement. The frequency stabilization of the single-frequency λ on pulsed laser was 1.0 MHz. Experimental horizontal CO2 measurement over a column range of 2.6–5.6 km and 900 shot pairs (1-min integration time) was conducted on 22 October 2009 to examine the detection sensitivity of the Co2DiaWiL. The achieved precision was less than 2.1%. The root-mean-square of the differences between the 30-min CO2 averages measured by the Co2DiaWiL and a ground-based in situ instrument was 0.9% (3.5 ppm). Experimental vertical CO2 measurements were conducted in February 2010 and January and February 2011. The partial CO2 column-averaged dry-air mixing ratios (XCO2) for an altitude between 0.4 and 1.0 km in 2010 and 2011 were 403.2 ± 4.2 and 405.6 ± 3.4 ppm, respectively. In the paper, the Co2DiaWiL results were well validated carefully against those of the airborne in situ instrument; they agreed well within the margin of error. The values of XCO2 measured in presence of cirrus clouds near the tropopause (hard target cases) show a difference of less than 4.1 ppm with the airborne measurements performed on 14 February 2010. This result demonstrates the capability of the Co2DiaWiL to measure XCO2 within a precision better than 1%.

scholarly journals Laser frequency offset locking via tripod-type electromagnetically induced transparency

2014 ◽  
Vol 53 (12) ◽  
pp. 2632 ◽  
Author(s):  
Kang Ying ◽  
Yueping Niu ◽  
Dijun Chen ◽  
Haiwen Cai ◽  
Ronghui Qu ◽  
...  
Keyword(s):  
Electromagnetically Induced Transparency ◽  
Laser Frequency ◽  
Frequency Offset ◽  
Induced Transparency

Effect of laser frequency offset on optical minimum-shift keying transmission system

2008 ◽  
Author(s):  
Han Chen ◽  
Yi Dong ◽  
Hao He ◽  
Weisheng Hu ◽  
Lemin Li
Keyword(s):  
Laser Frequency ◽  
Frequency Offset ◽  
Transmission System ◽  
Shift Keying

scholarly journals Laser frequency offset locking using electromagnetically induced transparency

2007 ◽  
Vol 90 (17) ◽  
pp. 171120 ◽  
Author(s):  
S. C. Bell ◽  
D. M. Heywood ◽  
J. D. White ◽  
J. D. Close ◽  
R. E. Scholten
Keyword(s):  
Electromagnetically Induced Transparency ◽  
Laser Frequency ◽  
Frequency Offset ◽  
Induced Transparency

Laser frequency offset-locking using electromagnetically induced transparency spectroscopy of 85 Rb in magnetic field

2018 ◽  
Vol 27 (9) ◽  
pp. 094205
Author(s):  
Han-Mu Wang ◽  
Hong Cheng ◽  
Shan-Shan Zhang ◽  
Pei-Pei Xin ◽  
Zi-Shan Xu ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Electromagnetically Induced Transparency ◽  
Laser Frequency ◽  
Frequency Offset ◽  
Induced Transparency

Seed laser frequency stabilization for Doppler wind lidar

2012 ◽  
Vol 10 (9) ◽  
pp. 091405-91407 ◽  
Author(s):  
Zhenglan Bian Zhenglan Bian ◽  
Chongde Huang Chongde Huang ◽  
Dijun Chen Dijun Chen ◽  
Jiaobo Peng Jiaobo Peng ◽  
Min Gao Min Gao ◽  
...  
Keyword(s):  
Laser Frequency ◽  
Frequency Stabilization ◽  
Seed Laser ◽  
Laser Frequency Stabilization ◽  
Wind Lidar ◽  
Doppler Wind Lidar

Modulation-free laser frequency offset locking using buffer gas-induced resonance

2013 ◽  
Vol 11 (10) ◽  
pp. 100201-100203 ◽  
Author(s):  
Guoqing Yang Guoqing Yang ◽  
Yunfei Xu) Yunfei Xu) ◽  
Qiang Lin Qiang Lin ◽  
Han Zhang Han Zhang
Keyword(s):  
Laser Frequency ◽  
Frequency Offset ◽  
Buffer Gas

scholarly journals Performance and Technique of Coherent 2-μm Differential Absorption and Wind Lidar for Wind Measurement

2013 ◽  
Vol 30 (3) ◽  
pp. 429-449 ◽  
Author(s):  
Hironori Iwai ◽  
Shoken Ishii ◽  
Ryoko Oda ◽  
Kohei Mizutani ◽  
Shinya Sekizawa ◽  
...  
Keyword(s):  
Wind Velocity ◽  
Signal To Noise Ratio ◽  
Sonic Anemometer ◽  
Correlation Coefficients ◽  
Co2 Concentration ◽  
Horizontal Wind ◽  
Doppler Lidar ◽  
Differential Absorption ◽  
Velocity Measurements ◽  
Wind Lidar

Abstract A coherent 2-μm differential absorption and wind lidar (Co2DiaWiL) has been built with a high-power Q-switched Tm,Hm:YLF laser to measure CO2 concentration and radial wind speed. The performance of the Co2DiaWiL is described and analyzed, with a view to demonstrating system capabilities for remote measurements of wind velocities in the atmospheric boundary layer and free troposphere. Bias in the velocity measurements was estimated at −0.0069 m s−1 using measurements from a stationary hard target. The Co2DiaWiL achieved a velocity precision of 0.12 m s−1, derived from the magnitude of random error in radial wind velocity measurements. These measurements were made for ranges out to 20–25 km by using a horizontally fixed beam mode for average times of 1 min. Quantitative intercomparisons of 1-min averages between the Co2DiaWiL and a sonic anemometer revealed a correlation coefficient of 0.99. This study demonstrated measurements of horizontal wind profiles, by making radial wind velocity measurements with the Co2DiaWiL using conical scanning. Profile differences at higher levels could be attributed to probable large horizontal separations of the radiosondes and the low signal-to-noise ratio of the Co2DiaWiL. A pseudo-dual-Doppler technique was developed to retrieve horizontal wind components with a single-Doppler lidar and a steering mirror. Intercomparisons of the 1-min-averaged u and υ components from the pseudo-dual-Doppler lidar measurements with those from the sonic anemometer revealed correlation coefficients of 0.84 and 0.83, respectively.

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