Abstract
An extra-cavity CO2-TEA laser pulse clipper for high spatial resolution atmospheric monitoring is presented. The clipper uses pulsed high voltageto facilitate the breakdown of the gas within the clipper cell. Complete extinction of the nitrogen tail, that degrades the range resolution of LIDARS, is obtained at pressures from 375 up to 1500 Torr for nitrogen and argon gases whereas an attenuation coefficient of almost 102 is achieved for helium. Excellent energy stability and pulse width repeatability were achieved using high voltage pre-ionized gas technique.
Highlights
The TEA transversely excited atmospheric CO2 laser pulse temporal profile typically has a tall, sharp spike followed by a long, drawn out nitrogen tail
The laser beam is usually focused inside the sealed clipper to high field intensities to create self-induced plasma which acts as a pulse clipper
The second channel is optical provided by the focused CO2-TEA laser pulse, whose field intensity is far superior to reach or even exceed the threshold of the gas breakdown in the clipper
Summary
The TEA transversely excited atmospheric CO2 laser pulse temporal profile typically has a tall, sharp spike followed by a long, drawn out nitrogen tail. The amplitude of the nitrogen tail is not nearly as high as the initial spike, the tail is drawn out over a time interval of 2–5 μμs and holds up to two-thirds of the total energy of the pulse. Laser self-induced gas breakdown clippers are unpredictable due to the large jitter characterizing their operations.
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