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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