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17 November 2014 Diode laser based water vapor DIAL using modulated pulse technique
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In this paper, we propose a diode laser based differential absorption lidar (DIAL) for measuring lower-tropospheric water vapor profile using the modulated pulse technique. The transmitter is based on single-mode diode laser and tapered semiconductor optical amplifier with a peak power of 10W around 800nm absorption band, and the receiver telescope diameter is 35cm. The selected wavelengths are compared to referenced wavelengths in terms of random error and systematic errors. The key component of modulated pulse technique, a macropulse, is generated with a repetition rate of 10 kHz, and the modulation within the macropulse is coded according to a pseudorandom sequence with 100ns chip width. As a result, we evaluate both single pulse modulation and pseudorandom coded pulse modulation technique. The water vapor profiles conducted from these modulation techniques are compared to the real observation data in summer in Japan.
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Phong Le Hoai Pham and Makoto Abo "Diode laser based water vapor DIAL using modulated pulse technique", Proc. SPIE 9262, Lidar Remote Sensing for Environmental Monitoring XIV, 926208 (17 November 2014);

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