5 May 2016 Wavelength locking to CO2 absorption line-center for 2-μm pulsed IPDA lidar application
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Abstract
An airborne 2-m triple-pulse integrated path differential absorption (IPDA) lidar is currently under development at NASA Langley Research Center (LaRC). This IPDA lidar system targets both atmospheric carbon dioxide (CO2) and water vapor (H2O) column measurements. Independent wavelength control of each of the transmitted laser pulses is a key feature for the success of this instrument. The wavelength control unit provides switching, tuning and locking for each pulse in reference to a 2-μm CW laser source locked to CO2 line-center. Targeting the CO2 R30 line center, at 2050.967 nm, a wavelength locking unit has been integrated using semiconductor laser diode. The CO2 center-line locking unit includes a laser diode current driver, temperature controller, center-line locking controller and CO2 absorption cell. This paper presents the CO2 center-line locking unit architecture, characterization procedure and results. Assessment of wavelength jitter on the IPDA measurement error will also be addressed by comparison to the system design.
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Tamer F. Refaat, Tamer F. Refaat, Mulugeta Petros, Mulugeta Petros, Charles W. Antill, Charles W. Antill, Upendra N. Singh, Upendra N. Singh, Jirong Yu, Jirong Yu, "Wavelength locking to CO2 absorption line-center for 2-μm pulsed IPDA lidar application", Proc. SPIE 9879, Lidar Remote Sensing for Environmental Monitoring XV, 987904 (5 May 2016); doi: 10.1117/12.2224950; https://doi.org/10.1117/12.2224950
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