Tunable, Narrow Linewidth, High Repetition Frequency Ce:LiCAF Lasers Pumped by the Fourth Harmonic of a Diode-Pumped Nd:YLF Laser for Ozone DIAL Measurements

Fromzel, V. A.; Prasad, Coorg R.; Petrosyan, K. A.; Liaw, Yishinn; Yakshin, M. A.; Shi, Wenhui; DeYoung, and Russell

doi:10.5772/7142

Cited by 4 publications

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References 9 publications

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“…The structureless nature of the absorption spectrum of ozone in this region allows for a minimum spacing of 2 nm between on and off resonant wavelengths (Milton et al, 1998) for accurate profiling of ozone throughout the free troposphere. Although the wavelengths used with this instrument are spaced further apart (10 nm), they have the advantage of being generated very reliably as opposed to previously used dye laser (Pelon and Mégie, 1982;Browell, 1983;Megie et al, 1985;Kuang et al, 2011), excimer laser (Uchino et al, 1983;de Schoulepnikoff et al, 1997;Veselovskii and Barchunov, 1999), and tunable laser cavity (Fix et al, 2002;Fromzel et al, 2010;Senff et al, 2010) systems. Figure 1, adapted from Malicet et al (1995), illustrates the ozone absorption cross section (σ O 3 ) and the TROPOZ wavelengths that were generated for the 3532 J. T. Sullivan: Tropospheric Ozone DIAL in the Baltimore-Washington, D.C. region large gradient in ozone absorption ( σ O 3 ), which will yield usable atmospheric information.…”

Section: The Differential Absorption Lidar (Dial) Methodsmentioning

confidence: 99%

A mobile differential absorption lidar to measure sub-hourly fluctuation of tropospheric ozone profiles in the Baltimore–Washington, D.C. region

et al. 2014

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Abstract. Tropospheric ozone profiles have been retrieved from the new ground-based National Aeronautics and Space Administration (NASA) Goddard Space Flight Center TROPospheric OZone DIfferential Absorption Lidar (GSFC TROPOZ DIAL) in Greenbelt, MD (38.99 • N, 76.84 • W, 57 m a.s.l.), from 400 m to 12 km a.g.l. Current atmospheric satellite instruments cannot peer through the optically thick stratospheric ozone layer to remotely sense boundary layer tropospheric ozone. In order to monitor this lower ozone more effectively, the Tropospheric Ozone Lidar Network (TOLNet) has been developed, which currently consists of five stations across the US. The GSFC TROPOZ DIAL is based on the DIAL technique, which currently detects two wavelengths, 289 and 299 nm, with multiple receivers. The transmitted wavelengths are generated by focusing the output of a quadrupled Nd:YAG laser beam (266 nm) into a pair of Raman cells, filled with high-pressure hydrogen and deuterium, using helium as buffer gas. With the knowledge of the ozone absorption coefficient at these two wavelengths, the range-resolved number density can be derived. An interesting atmospheric case study involving the stratospherictropospheric exchange (STE) of ozone is shown, to emphasize the regional importance of this instrument as well as to assess the validation and calibration of data. There was a low amount of aerosol aloft, and an iterative aerosol correction has been performed on the retrieved data, which resulted in less than a 3 ppb correction to the final ozone concentration. The retrieval yields an uncertainty of 16-19 % from 0 to 1.5 km, 10-18 % from 1.5 to 3 km, and 11-25 % from 3 to 12 km according to the relevant aerosol concentration aloft. There are currently surface ozone measurements hourly and ozonesonde launches occasionally, but this system will be the first to make routine tropospheric ozone profile measurements in the Baltimore-Washington, D.C. area.

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Section: The Differential Absorption Lidar (Dial) Methodsmentioning

confidence: 99%

A mobile differential absorption lidar to measure sub-hourly fluctuation of tropospheric ozone profiles in the Baltimore–Washington, D.C. region

et al. 2014

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Spectroscopic properties of UV active medium Ce3+:LiSr0.8Ca0.2AlF6

et al. 2016

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A compact mobile ozone lidar for atmospheric ozone and aerosol profiling

2014

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A compact mobile differential absorption lidar (DIAL) system has been developed at NASA Langley Research Center to provide ozone, aerosol and cloud atmospheric measurements in a mobile trailer for ground-based atmospheric ozone air quality campaigns. This lidar is integrated into the Tropospheric Ozone Lidar Network (TOLNet) currently made up of four other ozone lidars across the country. The lidar system consists of a UV and green laser transmitter, a telescope and an optical signal receiver with associated Licel photon counting and analog channels. The laser transmitter consist of a Q-switched Nd:YLF inter-cavity doubled laser pumping a Ce:LiCAF tunable UV laser with all the associated power and lidar control support units on a single system rack. The system has been configured to enable mobile operation from a trailer and was deployed to Denver, CO July 15-August 15, 2014 supporting the DISCOVER-AQ campaign. Ozone curtain plots and the resulting science are presented.

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Tunable, Narrow Linewidth, High Repetition Frequency Ce:LiCAF Lasers Pumped by the Fourth Harmonic of a Diode-Pumped Nd:YLF Laser for Ozone DIAL Measurements

Cited by 4 publications

References 9 publications

A mobile differential absorption lidar to measure sub-hourly fluctuation of tropospheric ozone profiles in the Baltimore–Washington, D.C. region

A mobile differential absorption lidar to measure sub-hourly fluctuation of tropospheric ozone profiles in the Baltimore–Washington, D.C. region

Spectroscopic properties of UV active medium Ce3+:LiSr0.8Ca0.2AlF6

A compact mobile ozone lidar for atmospheric ozone and aerosol profiling

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