AI Article Synopsis
- The study presents a Q-switched alexandrite laser system that is injection seeded by a continuous-wave titanium-sapphire laser for precise measurements.
- This setup successfully maintains frequency stabilization for detecting humidity, pressure, and temperature using differential absorption lidar.
- It achieves a high level of spectral stability, keeping the emission centroid within a very tight range of the absorption line, demonstrating reliability over an hour of operation.
Article Abstract
We describe a Q-switched alexandrite laser injection seeded with a cw single-mode titanium-sapphire laser. The reported experimental results show that this system meets the frequency stabilization required for differential absorption lidar measurement of humidity, pressure, and temperature. The emission of the cw titanium-sapphire master oscillator is locked to an atmospheric absorption line by means of a servoloop with derivative spectroscopy. The spectral position is stabilized within ±3.5 × 10(-4) cm(-1) (10 MHz) of the peak of the line over 1 hr. The alexandrite laser emits pulses of 30 mJ in 500 ns, with a spectral linewidth of ≈ 3.3 × 10(-3) cm(-1) (100 MHz). The position of the centroid of the emitted spectrum has a standard deviation of 6 × 10(-4) cm(-1) (18 MHz) and is held within ±1.3 × 10(-3) cm(-1) (40 MHz) of the peak of the absorption line over 1 h.
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| http://dx.doi.org/10.1364/AO.33.003941 | DOI Listing |
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