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Related Experiment Video

Updated: Jun 12, 2026

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing

Published on: December 3, 2013

Simultaneous NO and NO(2) DIAL measurement using BBO crystals.

H J Kölsch, P Rairoux, J P Wolf

|June 18, 2010

Summary

A new lidar technique measures atmospheric nitrogen oxides (NO and NO2) simultaneously. This method uses frequency doubling with a novel crystal, achieving detection limits of ~1 ppm·m for NO2 and 100 ppb·m for NO.

Area of Science:

Atmospheric Chemistry
Environmental Monitoring
Spectroscopy

Background:

Accurate measurement of nitrogen oxides (NO and NO2) is crucial for air quality assessment.
Traditional methods for NO and NO2 detection can be complex or limited in scope.

Purpose of the Study:

To develop and demonstrate a novel differential absorption lidar (DIAL) technique for simultaneous atmospheric NO and NO2 measurement.
To leverage advancements in nonlinear optical crystals for improved lidar performance.

Main Methods:

Utilized a differential absorption lidar system employing frequency doubling.
Correlated the 450-nm absorption band of NO2 and the 227-nm absorption band of NO.
Employed a new, highly efficient beta-BaB2O4 (BBO) crystal for frequency doubling.

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Last Updated: Jun 12, 2026

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing

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Published on: December 3, 2013

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Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization

Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization

Published on: August 6, 2018

Main Results:

Successfully demonstrated the technique's efficiency in a test experiment on a NO/NO2 emitter.
Achieved a detection limit of approximately 1 ppm·m for NO2.
Achieved a detection limit of approximately 100 ppb·m for NO.

Conclusions:

The developed DIAL technique offers a promising method for simultaneous NO and NO2 monitoring.
The use of advanced BBO crystals enhances the feasibility of this spectroscopic approach.
Measurement range is currently limited to 1 km due to UV scattering and absorption effects.