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Construction and Characterization of External Cavity Diode Lasers for Atomic Physics

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Offset local oscillator for cw laser Doppler anemometry.

R L Schwiesow, R E Cupp

|March 24, 2010

Summary

A new heterodyne continuous-wave Doppler backscatter anemometer uses two carbon dioxide (CO2) lasers for remote wind sensing. This simple lidar setup achieves a wind speed threshold of 0.25 m/s with 10% velocity uncertainty.

Area of Science:

Atmospheric science
Optical physics
Remote sensing technology

Background:

Doppler lidar systems are crucial for atmospheric wind measurements.
Heterodyne detection offers advantages in sensitivity and signal processing for lidar.
Previous Doppler lidar setups often require complex optical configurations.

Purpose of the Study:

To develop a simplified heterodyne continuous-wave (cw) Doppler backscatter anemometer.
To demonstrate its application in a lidar system for remote wind sensing.
To evaluate the performance of the new configuration compared to homodyne setups.

Main Methods:

Utilized two carbon dioxide (CO2) lasers, with one frequency-locked to the other.
Implemented a heterodyne detection scheme for Doppler backscatter.

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Tested the system in a lidar configuration for vertical wind measurements.

Main Results:

The heterodyne configuration requires no additional optics or detectors compared to a homodyne setup.
Successfully measured vertical wind spectra.
Achieved a wind speed threshold of 0.25 m/s.
Demonstrated an uncertainty of +/-10% in velocity estimation.

Conclusions:

The developed heterodyne cw Doppler backscatter anemometer is a simple and effective tool for remote wind sensing.
This configuration offers a practical alternative to more complex lidar systems.
The system shows promise for accurate atmospheric wind velocity measurements.